path: root/src/FundLab.Api/Persistence.fs

namespace FundLab.Api

open System
open System.Data
open System.Data.Common
open System.Globalization
open System.Security.Cryptography
open System.Text
open FundLab.Domain
open Npgsql
open NpgsqlTypes
open System.Text.Json

module ConfirmationPolicy =
    let cutoffTimeOfDay = TimeSpan(15, 0, 0)
    let unitsMaximum = 99999999999999999999.99999999m
    let amountMaximum = 999999999999999999.99m

    let private shanghaiZone =
        lazy (
            try
                TimeZoneInfo.FindSystemTimeZoneById("Asia/Shanghai")
            with _ ->
                TimeZoneInfo.CreateCustomTimeZone(
                    "Asia/Shanghai (UTC+8)",
                    TimeSpan(8, 0, 0),
                    "Asia/Shanghai (UTC+8)",
                    "Asia/Shanghai (UTC+8)"
                )
        )

    let shanghaiDate (moment: DateTimeOffset) : DateOnly =
        DateOnly.FromDateTime(TimeZoneInfo.ConvertTime(moment, shanghaiZone.Value).Date)

    let private isWeekend (date: DateOnly) =
        date.DayOfWeek = DayOfWeek.Saturday || date.DayOfWeek = DayOfWeek.Sunday

    let rec private rollToWeekday (date: DateOnly) =
        if isWeekend date then rollToWeekday (date.AddDays 1) else date

    let isModeledTradingDay (date: DateOnly) : bool = not (isWeekend date)

    /// Test-only clock anchor: modules may pin the trading-date clock by exporting
    /// FUND_LAB_TEST_TRADE_DATE so suites stay independent of the wall clock. Unset in
    /// production, the real Shanghai rule applies unchanged.
    let tradeDateFor (submittedAt: DateTimeOffset) : DateOnly =
        match Environment.GetEnvironmentVariable("FUND_LAB_TEST_TRADE_DATE") with
        | value when not (String.IsNullOrWhiteSpace value) ->
            match DateOnly.TryParseExact(value, "yyyy-MM-dd", CultureInfo.InvariantCulture, DateTimeStyles.None) with
            | true, anchored -> anchored
            | _ ->
                let local = TimeZoneInfo.ConvertTime(submittedAt, shanghaiZone.Value)
                let date = DateOnly.FromDateTime(local.Date)
                let candidate = if local.TimeOfDay >= cutoffTimeOfDay then date.AddDays 1 else date
                rollToWeekday candidate
        | _ ->
            let local = TimeZoneInfo.ConvertTime(submittedAt, shanghaiZone.Value)
            let date = DateOnly.FromDateTime(local.Date)
            let candidate = if local.TimeOfDay >= cutoffTimeOfDay then date.AddDays 1 else date
            rollToWeekday candidate

    /// Calendar date used to bucket events (cash flows, holdings) on the returns
    /// timeline. Shares the FUND_LAB_TEST_TRADE_DATE anchor with tradeDateFor so a
    /// pinned suite does not drift when the host crosses midnight; production (no
    /// pin) is exactly the Shanghai calendar date of the moment.
    let eventDateFor (moment: DateTimeOffset) : DateOnly =
        match Environment.GetEnvironmentVariable("FUND_LAB_TEST_TRADE_DATE") with
        | value when not (String.IsNullOrWhiteSpace value) ->
            match DateOnly.TryParseExact(value, "yyyy-MM-dd", CultureInfo.InvariantCulture, DateTimeStyles.None) with
            | true, anchored -> anchored
            | _ -> shanghaiDate moment
        | _ -> shanghaiDate moment

    type NavQuote =
        { NavDate: DateOnly
          Nav: decimal
          CollectedAt: DateTimeOffset
          PublishedAt: DateTimeOffset option }

    type ConfirmationComputation =
        {
            Units: decimal
            InvestedCash: decimal
            ResidualCash: decimal
        }

    let navDeferralReason
        (quote: NavQuote)
        (tradeDate: DateOnly)
        (today: DateOnly)
        (now: DateTimeOffset)
        : string option =
        let tradeDateText = tradeDate.ToString("yyyy-MM-dd")

        if quote.Nav <= 0m then
            Some(sprintf "nav for trade date %s is not positive" tradeDateText)
        elif quote.NavDate > today then
            Some(sprintf "nav for trade date %s is dated in the future" tradeDateText)
        elif quote.CollectedAt > now then
            Some(sprintf "nav for trade date %s is not yet collected" tradeDateText)
        elif quote.PublishedAt |> Option.exists (fun publishedAt -> publishedAt > now) then
            Some(sprintf "nav for trade date %s is not yet published" tradeDateText)
        elif quote.NavDate <> tradeDate then
            Some(sprintf "nav for trade date %s is not available yet" tradeDateText)
        else
            None

    let compute (amount: decimal) (nav: decimal) : Result<ConfirmationComputation, string> =
        if amount <= 0m then
            Error "amount must be positive"
        elif amount > amountMaximum then
            Error "amount exceeds supported precision"
        elif nav <= 0m then
            Error "unit nav must be positive"
        elif nav < 0.00000001m then
            Error "unit nav is below database precision"
        else
            let rawUnits = amount / nav

            if rawUnits > unitsMaximum then
                Error "unit amount exceeds database precision"
            else
                let units = Decimal.Truncate(rawUnits * 100000000m) / 100000000m

                if units <= 0m then
                    Error "amount converts to zero units at this unit nav"
                else
                    let invested = Decimal.Truncate(units * nav * 100m) / 100m

                    Ok
                        {
                            Units = units
                            InvestedCash = invested
                            ResidualCash = amount - invested
                        }

[<CLIMutable>]
type FundCreateCommand =
    {
        Name: string
        InitialCash: decimal
        InitialUnitNav: decimal
        IsSynthetic: bool
    }

type FundRecord =
    {
        Id: Guid
        Name: string
        Currency: string
        InitialCash: decimal
        InitialUnitNav: decimal
        IsSynthetic: bool
        AvailableCash: decimal
        ReservedCash: decimal
        Status: string
        CreatedAt: DateTimeOffset
    }

type FundWriteResult =
    | Created of FundRecord
    | Replayed of FundRecord
    | IdempotencyConflict
    | Invalid of string

[<CLIMutable>]
type SubscriptionOrderCommand =
    {
        FundCode: string
        Amount: decimal
        FeeAmount: decimal
    }

type ConfirmedQuoteEvidence =
    {
        Nav: decimal
        NavDate: DateOnly
        Source: string
        Revision: string
        CollectedAt: DateTimeOffset
        PublishedAt: DateTimeOffset option
        PayloadHash: string
        FirstSeenAt: DateTimeOffset
    }

type SubscriptionOrderRecord =
    {
        Id: Guid
        FundId: Guid
        FundCode: string
        Amount: decimal
        FeeAmount: decimal
        ReservedTotal: decimal
        Status: string
        SubmittedAt: DateTimeOffset
        IsSynthetic: bool
        TradeDate: DateOnly
        ConfirmIdempotencyKey: string option
        PendingReason: string option
        ConfirmedAt: DateTimeOffset option
        ConfirmedQuote: ConfirmedQuoteEvidence option
        ConfirmedUnits: decimal option
        ConfirmedInvestedCash: decimal option
        ConfirmedResidualCash: decimal option
    }

type SubscriptionOrderWriteResult =
    | OrderCreated of SubscriptionOrderRecord
    | OrderReplayed of SubscriptionOrderRecord
    | OrderIdempotencyConflict
    | OrderInvalid of string
    | OrderFundNotFound
    | OrderInstrumentNotFound
    | OrderInsufficientFunds

type SubscriptionConfirmResult =
    | OrderConfirmed of SubscriptionOrderRecord
    | ConfirmReplayed of SubscriptionOrderRecord
    | ConfirmPendingNav of SubscriptionOrderRecord
    | ConfirmIdempotencyConflict
    | ConfirmAlreadyConfirmed
    | ConfirmOrderNotFound
    | ConfirmInvalidStatus
    | ConfirmInvalid of string

type FundPositionRecord =
    {
        FundId: Guid
        InstrumentCode: string
        Units: decimal
        ReservedUnits: decimal
        CostCash: decimal
        LastConfirmedAt: DateTimeOffset
        ValuationNav: decimal option
        ValuationNavDate: DateOnly option
        ValuationCollectedAt: DateTimeOffset option
    }

type RedemptionCommand =
    {
        InstrumentCode: string
        Units: decimal
        FeeAmount: decimal
    }

type RedemptionOrderRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        Units: decimal
        FeeAmount: decimal
        Status: string
        IsSynthetic: bool
        SubmittedAt: DateTimeOffset
        TradeDate: DateOnly
        ConfirmIdempotencyKey: string option
        PendingReason: string option
        ConfirmedAt: DateTimeOffset option
        ConfirmedNav: decimal option
        ConfirmedNavDate: DateOnly option
        ConfirmedProceeds: decimal option
        ConfirmedCostReleased: decimal option
    }

type RedemptionWriteResult =
    | RedemptionCreated of RedemptionOrderRecord
    | RedemptionReplayed of RedemptionOrderRecord
    | RedemptionIdempotencyConflict
    | RedemptionInvalid of string
    | RedemptionFundNotFound
    | RedemptionInstrumentNotFound
    | RedemptionInsufficientUnits

type RedemptionConfirmResult =
    | RedemptionConfirmed of RedemptionOrderRecord
    | RedemptionConfirmReplayed of RedemptionOrderRecord
    | RedemptionPendingNav of RedemptionOrderRecord
    | RedemptionConfirmIdempotencyConflict
    | RedemptionAlreadyConfirmed
    | RedemptionOrderNotFound
    | RedemptionInvalidStatus
    | RedemptionInvalid of string

type SipPlanCommand =
    {
        InstrumentCode: string
        Amount: decimal
        Frequency: SipFrequency
    }

/// Minimal live-quote view used to drive a stock SIP period. The resolver is
/// supplied by the API layer (which owns the market-data probe); the repository
/// only interprets the snapshot.
type StockSipQuote =
    {
        Price: decimal option
        Name: string option
        Suspended: bool option
    }

type StockTradeCommand =
    {
        InstrumentCode: string
        StockName: string option
        Quantity: decimal
        Price: decimal
    }

type StockTradeRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        StockName: string option
        Quantity: decimal
        Price: decimal
        CostCash: decimal
        IsSynthetic: bool
        ExecutedAt: DateTimeOffset
    }

type StockPositionRecord =
    {
        FundId: Guid
        InstrumentCode: string
        StockName: string option
        Quantity: decimal
        CostCash: decimal
        LastTradedAt: DateTimeOffset
    }

type StockTradeWriteResult =
    | StockTradeCreated of StockTradeRecord
    | StockTradeReplayed of StockTradeRecord
    | StockTradeIdempotencyConflict
    | StockTradeInvalid of string
    | StockTradeInsufficientFunds of string
    | StockTradeFundNotFound

type StockSellCommand =
    {
        InstrumentCode: string
        StockName: string option
        Quantity: decimal
        Price: decimal
        FeeAmount: decimal
    }

type StockSellRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        StockName: string option
        Quantity: decimal
        Price: decimal
        FeeAmount: decimal
        Proceeds: decimal
        IsSynthetic: bool
        ExecutedAt: DateTimeOffset
    }

type StockSellWriteResult =
    | StockSellCreated of StockSellRecord
    | StockSellReplayed of StockSellRecord
    | StockSellIdempotencyConflict
    | StockSellInvalid of string
    | StockSellInsufficientHoldings of string
    | StockSellFundNotFound

type StockCashflowCommand =
    {
        InstrumentCode: string
        StockName: string option
        /// "buy" (cash out), "sell" (cash in) or "dividend" (cash in).
        EventType: string
        EventDate: DateOnly
        Quantity: decimal
        /// Absolute cash magnitude; the sign is implied by the event type.
        Amount: decimal
        Note: string option
    }

type StockCashflowRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        StockName: string option
        EventType: string
        EventDate: DateOnly
        Quantity: decimal
        Amount: decimal
        Note: string option
        IsSynthetic: bool
        CreatedAt: DateTimeOffset
    }

type StockCashflowWriteResult =
    | StockCashflowCreated of StockCashflowRecord
    | StockCashflowReplayed of StockCashflowRecord
    | StockCashflowIdempotencyConflict
    | StockCashflowInvalid of string
    | StockCashflowFundNotFound

type BondTradeCommand =
    {
        InstrumentCode: string
        BondName: string option
        Quantity: decimal
        /// All-in (dirty/全价) execution price per 100 of face value.
        Price: decimal
        CleanPrice: decimal
        AccruedInterest: decimal
        ParValue: decimal
        SettlementDate: DateOnly
        CouponRate: decimal option
        ValueDate: DateOnly option
        MaturityDate: DateOnly option
        /// Explicit trade/valuation date supplied by the caller (wins over the
        /// quote's own date so tests and backfills stay deterministic).
        TradeDate: DateOnly option
    }

type BondTradeRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        BondName: string option
        Quantity: decimal
        Price: decimal
        CleanPrice: decimal
        AccruedInterest: decimal
        ParValue: decimal
        SettlementDate: DateOnly
        CouponRate: decimal option
        ValueDate: DateOnly option
        MaturityDate: DateOnly option
        TradeDate: DateOnly
        CostCash: decimal
        IsSynthetic: bool
        ExecutedAt: DateTimeOffset
    }

type BondCashflowCommand =
    {
        InstrumentCode: string
        BondName: string option
        /// "coupon" (付息) or "maturity" (到期).
        EventType: string
        EventDate: DateOnly
        Quantity: decimal
        /// Cash credited to the fund's available cash.
        Amount: decimal
        Note: string option
    }

type BondCashflowRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        BondName: string option
        EventType: string
        EventDate: DateOnly
        Quantity: decimal
        Amount: decimal
        Note: string option
        IsSynthetic: bool
        CreatedAt: DateTimeOffset
    }

type BondCashflowWriteResult =
    | BondCashflowCreated of BondCashflowRecord
    | BondCashflowReplayed of BondCashflowRecord
    | BondCashflowIdempotencyConflict
    | BondCashflowInvalid of string
    | BondCashflowFundNotFound
    | BondCashflowPositionNotFound

type BondPositionRecord =
    {
        FundId: Guid
        InstrumentCode: string
        BondName: string option
        Quantity: decimal
        CostCash: decimal
        LastTradedAt: DateTimeOffset
    }

type BondSellCommand =
    {
        InstrumentCode: string
        BondName: string option
        Quantity: decimal
        /// All-in (dirty/全价) sell price per 100 of face value.
        Price: decimal
        CleanPrice: decimal
        AccruedInterest: decimal
        ParValue: decimal
        SettlementDate: DateOnly
        TradeDate: DateOnly option
        FeeAmount: decimal
    }

type BondSellRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        BondName: string option
        Quantity: decimal
        Price: decimal
        CleanPrice: decimal
        AccruedInterest: decimal
        ParValue: decimal
        SettlementDate: DateOnly
        TradeDate: DateOnly
        FeeAmount: decimal
        /// Cash credited to the fund after fees (dirty amount minus fee).
        Proceeds: decimal
        /// Average-cost basis removed from the position.
        CostReleased: decimal
        RealizedPnl: decimal
        IsSynthetic: bool
        ExecutedAt: DateTimeOffset
    }

type BondSellWriteResult =
    | BondSellCreated of BondSellRecord
    | BondSellReplayed of BondSellRecord
    | BondSellIdempotencyConflict
    | BondSellInvalid of string
    | BondSellInsufficientHoldings of string
    | BondSellFundNotFound

type InstrumentSnapshotRecord =
    {
        InstrumentCode: string
        AssetClass: string
        SnapshotDate: DateOnly
        Price: decimal
        Source: string
        SourceRevision: string
        SourceCollectedAt: DateTimeOffset
        SourcePayloadHash: string
    }

type BondTradeWriteResult =
    | BondTradeCreated of BondTradeRecord
    | BondTradeReplayed of BondTradeRecord
    | BondTradeIdempotencyConflict
    | BondTradeInvalid of string
    | BondTradeFundNotFound

type SipPlanRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        AssetClass: string
        Amount: decimal
        Frequency: SipFrequency
        Status: string
        IsSynthetic: bool
        AnchorDate: DateOnly
        NextTradeDate: DateOnly
        CreatedAt: DateTimeOffset
        LastExecutionStatus: string option
        LastExecutionDate: DateOnly option
    }

type SipPlanWriteResult =
    | SipPlanCreated of SipPlanRecord
    | SipPlanReplayed of SipPlanRecord
    | SipPlanIdempotencyConflict
    | SipPlanInvalid of string
    | SipPlanFundNotFound
    | SipPlanInstrumentNotFound

type SipPlanStatusResult =
    | SipPlanStatusChanged of SipPlanRecord
    | SipPlanStatusNotFound

type SipExecutionOutcome =
    {
        TradeDate: DateOnly
        Status: string
        OrderId: Guid option
        PendingReason: string option
    }

type SipPlanAdvanceResult =
    {
        PlanId: Guid
        InstrumentCode: string
        AssetClass: string
        Amount: decimal
        Frequency: SipFrequency
        Executions: SipExecutionOutcome list
        NextTradeDate: DateOnly
    }

type SipAdvanceResult =
    {
        FundId: Guid
        Plans: SipPlanAdvanceResult list
    }

type InvestmentPlanCommand =
    {
        InstrumentCode: string
        Amount: decimal
        Frequency: InvestmentFrequency
    }

type InvestmentPlanRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        Amount: decimal
        Frequency: InvestmentFrequency
        Status: string
        IsSynthetic: bool
        AnchorDate: DateOnly
        NextRunDate: DateOnly
        CreatedAt: DateTimeOffset
        LastRunStatus: string option
        LastRunDate: DateOnly option
    }

type InvestmentPlanWriteResult =
    | InvestmentPlanCreated of InvestmentPlanRecord
    | InvestmentPlanReplayed of InvestmentPlanRecord
    | InvestmentPlanIdempotencyConflict
    | InvestmentPlanInvalid of string
    | InvestmentPlanFundNotFound
    | InvestmentPlanInstrumentNotFound

type InvestmentPlanRunOutcome =
    {
        RunDate: DateOnly
        Status: string
        OrderId: Guid option
        PendingReason: string option
    }

type InvestmentPlanRunPlanResult =
    {
        PlanId: Guid
        InstrumentCode: string
        Amount: decimal
        Frequency: InvestmentFrequency
        Runs: InvestmentPlanRunOutcome list
        NextRunDate: DateOnly
    }

type InvestmentPlanRunResult =
    {
        FundId: Guid
        ProcessingDate: DateOnly
        Plans: InvestmentPlanRunPlanResult list
    }

type RebalanceTarget = RebalancePolicy.TargetAllocation

type RebalancePlanCommand =
    {
        Targets: RebalanceTarget list
    }

type RebalancePlanRecord =
    {
        Id: Guid
        FundId: Guid
        Targets: RebalanceTarget list
        Status: string
        IsSynthetic: bool
        CreatedAt: DateTimeOffset
    }

type RebalanceWriteResult =
    | RebalancePlanCreated of RebalancePlanRecord
    | RebalancePlanReplayed of RebalancePlanRecord
    | RebalanceIdempotencyConflict
    | RebalanceInvalid of string
    | RebalanceFundNotFound
    | RebalanceInstrumentNotFound

type RebalanceArchiveResult =
    | RebalancePlanArchived of RebalancePlanRecord
    | RebalanceArchiveNotFound

type RebalanceOrderOutcome =
    {
        InstrumentCode: string
        Action: string
        Amount: string
        Status: string
        OrderId: Guid option
        PendingReason: string option
    }

type RebalanceExecutionResult =
    {
        PlanId: Guid
        RunDate: DateOnly
        Outcomes: RebalanceOrderOutcome list
    }

type RebalanceExecutionRecord =
    {
        PlanId: Guid
        RunDate: DateOnly
        InstrumentCode: string
        Action: string
        Amount: decimal
        Status: string
        OrderId: Guid option
        PendingReason: string option
        ExecutedAt: DateTimeOffset
    }

type RebalancePreview =
    {
        PlanId: Guid
        RunDate: DateOnly
        AvailableCash: decimal
        Equity: decimal
        Rows: RebalancePolicy.RebalanceWeightRow list
    }

type DividendMode = DividendPolicy.DividendMode

type DividendCommand =
    {
        InstrumentCode: string
        NavDate: DateOnly
        Dps: decimal
        Mode: DividendMode
    }

type DividendRecord =
    {
        Id: Guid
        FundId: Guid
        InstrumentCode: string
        NavDate: DateOnly
        Dps: decimal
        Mode: DividendMode
        Status: string
        IsSynthetic: bool
        GrossCash: decimal option
        CreditedUnits: decimal option
        CreditedInvested: decimal option
        OrderId: Guid option
        PendingReason: string option
        CreatedAt: DateTimeOffset
    }

type DividendWriteResult =
    | DividendCredited of DividendRecord
    | DividendReplayed of DividendRecord
    | DividendPendingReinvest of DividendRecord
    | DividendIdempotencyConflict
    | DividendInvalid of string
    | DividendFundNotFound
    | DividendInstrumentNotFound
    | DividendNoHoldings

type DividendStageDecision =
    | StageReplay of Guid
    | StageFail of DividendWriteResult
    | StageBooked of DividendRecord


type CapitalDepositCommand =
    {
        Amount: decimal
        Note: string option
    }

type CapitalDepositRecord =
    {
        Id: Guid
        FundId: Guid
        Amount: decimal
        Note: string option
        IsSynthetic: bool
        CreatedAt: DateTimeOffset
    }

type CapitalDepositWriteResult =
    | CapitalDepositCreated of CapitalDepositRecord
    | CapitalDepositReplayed of CapitalDepositRecord
    | CapitalDepositIdempotencyConflict
    | CapitalDepositInvalid of string
    | CapitalDepositFundNotFound

/// One reconstructed end-of-day fund valuation. `TotalAssets`/`UnitNav`/
/// `HoldingsValue`/`CumulativeReturn` are `None` when a held instrument has no
/// NAV observation dated on or before `Date`: the value is unknown, never zero.
type FundReturnsPoint =
    {
        Date: DateOnly
        Pending: bool
        TotalAssets: decimal option
        UnitNav: decimal option
        Cash: decimal
        ReservedCash: decimal
        HoldingsValue: decimal option
        CumulativeReturn: decimal option
        NetExternalFlow: decimal
    }

type FundReturns =
    {
        FundId: Guid
        Pending: bool
        DataUpdatedAt: DateTimeOffset option
        Points: FundReturnsPoint list
    }

type FundRepository(connectionString: string) =
    let cashMaximum = 999999999999999999.99m
    let unitNavMaximum = 99999999999999999999.99999999m

    let schema =
        """
        CREATE TABLE IF NOT EXISTS funds (
            id uuid PRIMARY KEY,
            name text NOT NULL,
            currency text NOT NULL,
            initial_cash numeric(20, 2) NOT NULL,
            initial_unit_nav numeric(28, 8) NOT NULL,
            is_synthetic boolean NOT NULL,
            available_cash numeric(20, 2) NOT NULL,
            status text NOT NULL,
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS fund_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS instruments (
            code text PRIMARY KEY CHECK (code ~ '^[0-9]{6}$'),
            name text NOT NULL,
            fund_type text NULL,
            source text NOT NULL,
            source_revision text NOT NULL,
            source_collected_at timestamptz NOT NULL,
            source_payload_hash text NOT NULL,
            first_seen_at timestamptz NOT NULL DEFAULT now(),
            last_seen_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS fund_nav_observations (
            instrument_code text NOT NULL REFERENCES instruments(code),
            nav_date date NOT NULL,
            published_at timestamptz NULL,
            nav numeric(28, 8) NOT NULL,
            accumulated_nav numeric(28, 8) NULL,
            daily_return numeric(20, 8) NULL,
            source text NOT NULL,
            source_revision text NOT NULL,
            source_collected_at timestamptz NOT NULL,
            source_payload_hash text NOT NULL,
            first_seen_at timestamptz NOT NULL DEFAULT now(),
            last_seen_at timestamptz NOT NULL DEFAULT now(),
            PRIMARY KEY (instrument_code, nav_date)
        );

        CREATE INDEX IF NOT EXISTS fund_nav_observations_date_idx
            ON fund_nav_observations (instrument_code, nav_date);

        CREATE TABLE IF NOT EXISTS fund_nav_observation_evidence (
            instrument_code text NOT NULL REFERENCES instruments(code),
            nav_date date NOT NULL,
            source_payload_hash text NOT NULL,
            source_revision text NOT NULL,
            source text NOT NULL,
            source_collected_at timestamptz NOT NULL,
            published_at timestamptz NULL,
            nav numeric(28, 8) NOT NULL,
            first_seen_at timestamptz NOT NULL DEFAULT now(),
            PRIMARY KEY (instrument_code, nav_date, source_payload_hash)
        );

        ALTER TABLE funds ADD COLUMN IF NOT EXISTS reserved_cash numeric(20, 2) NOT NULL DEFAULT 0;

        CREATE TABLE IF NOT EXISTS subscription_orders (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            fund_code text NOT NULL,
            amount numeric(20, 2) NOT NULL CHECK (amount > 0),
            fee_amount numeric(20, 2) NOT NULL CHECK (fee_amount >= 0),
            reserved_total numeric(20, 2) NOT NULL CHECK (reserved_total > 0),
            status text NOT NULL,
            is_synthetic boolean NOT NULL,
            submitted_at timestamptz NOT NULL DEFAULT now()
        );

        ALTER TABLE subscription_orders DROP CONSTRAINT IF EXISTS subscription_orders_fee_amount_check;
        ALTER TABLE subscription_orders ADD CONSTRAINT subscription_orders_fee_amount_check CHECK (fee_amount >= 0);

        CREATE TABLE IF NOT EXISTS subscription_order_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            order_id uuid NOT NULL REFERENCES subscription_orders(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirm_idempotency_key text NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS pending_reason text NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_at timestamptz NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_nav numeric(28, 8) NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_nav_date date NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_nav_source text NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_nav_revision text NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_nav_collected_at timestamptz NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_nav_published_at timestamptz NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_units numeric(28, 8) NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_invested_cash numeric(20, 2) NULL;
        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_residual_cash numeric(20, 2) NULL;

        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_nav_payload_hash text NULL;

        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS confirmed_nav_first_seen_at timestamptz NULL;

        ALTER TABLE subscription_orders ADD COLUMN IF NOT EXISTS trade_date date NULL;

        UPDATE subscription_orders SET trade_date = (submitted_at AT TIME ZONE 'Asia/Shanghai')::date WHERE trade_date IS NULL;

        CREATE TABLE IF NOT EXISTS fund_positions (
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL REFERENCES instruments(code),
            units numeric(28, 8) NOT NULL CHECK (units > 0),
            cost_cash numeric(20, 2) NOT NULL CHECK (cost_cash >= 0),
            first_confirmed_at timestamptz NOT NULL,
            last_confirmed_at timestamptz NOT NULL,
            PRIMARY KEY (fund_id, instrument_code)
        );

        CREATE TABLE IF NOT EXISTS subscription_order_events (
            id bigserial PRIMARY KEY,
            order_id uuid NOT NULL REFERENCES subscription_orders(id),
            event_type text NOT NULL,
            detail jsonb NOT NULL,
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS subscription_confirm_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            order_id uuid NOT NULL REFERENCES subscription_orders(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS redemption_orders (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL REFERENCES instruments(code),
            units numeric(28, 8) NOT NULL CHECK (units > 0),
            fee_amount numeric(20, 2) NOT NULL CHECK (fee_amount >= 0),
            status text NOT NULL,
            is_synthetic boolean NOT NULL,
            submitted_at timestamptz NOT NULL DEFAULT now(),
            trade_date date NOT NULL,
            confirm_idempotency_key text NULL,
            pending_reason text NULL,
            confirmed_at timestamptz NULL,
            confirmed_nav numeric(28, 8) NULL,
            confirmed_nav_date date NULL,
            confirmed_proceeds numeric(20, 2) NULL,
            confirmed_cost_released numeric(20, 2) NULL
        );

        CREATE TABLE IF NOT EXISTS redemption_order_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            order_id uuid NOT NULL REFERENCES redemption_orders(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS redemption_confirm_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            order_id uuid NOT NULL REFERENCES redemption_orders(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        ALTER TABLE fund_positions ADD COLUMN IF NOT EXISTS reserved_units numeric(28, 8) NOT NULL DEFAULT 0;

        CREATE TABLE IF NOT EXISTS fund_capital_deposits (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            amount numeric(20, 2) NOT NULL CHECK (amount > 0),
            note text NULL,
            is_synthetic boolean NOT NULL,
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS fund_capital_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            deposit_id uuid NOT NULL REFERENCES fund_capital_deposits(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS sip_plans (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL REFERENCES instruments(code),
            amount numeric(20, 2) NOT NULL CHECK (amount > 0),
            frequency text NOT NULL,
            status text NOT NULL,
            is_synthetic boolean NOT NULL,
            anchor_date date NOT NULL,
            next_trade_date date NOT NULL,
            created_at timestamptz NOT NULL DEFAULT now()
        );

        ALTER TABLE sip_plans ADD COLUMN IF NOT EXISTS asset_class text NOT NULL DEFAULT 'fund';

        ALTER TABLE sip_plans DROP CONSTRAINT IF EXISTS sip_plans_instrument_code_fkey;

        CREATE TABLE IF NOT EXISTS sip_plan_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            plan_id uuid NOT NULL REFERENCES sip_plans(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS sip_executions (
            plan_id uuid NOT NULL REFERENCES sip_plans(id),
            trade_date date NOT NULL,
            amount numeric(20, 2) NOT NULL,
            fee_amount numeric(20, 2) NOT NULL,
            status text NOT NULL,
            order_id uuid NULL,
            pending_reason text NULL,
            executed_at timestamptz NOT NULL DEFAULT now(),
            PRIMARY KEY (plan_id, trade_date)
        );

        CREATE TABLE IF NOT EXISTS rebalance_plans (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            status text NOT NULL,
            is_synthetic boolean NOT NULL,
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS rebalance_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            plan_id uuid NOT NULL REFERENCES rebalance_plans(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS rebalance_targets (
            plan_id uuid NOT NULL REFERENCES rebalance_plans(id),
            instrument_code text NOT NULL REFERENCES instruments(code),
            target_percent numeric(9, 2) NOT NULL CHECK (target_percent > 0 AND target_percent <= 100),
            PRIMARY KEY (plan_id, instrument_code)
        );

        CREATE TABLE IF NOT EXISTS rebalance_executions (
            plan_id uuid NOT NULL REFERENCES rebalance_plans(id),
            run_date date NOT NULL,
            instrument_code text NOT NULL,
            action text NOT NULL,
            amount numeric(20, 2) NOT NULL,
            status text NOT NULL,
            order_id uuid NULL,
            pending_reason text NULL,
            executed_at timestamptz NOT NULL DEFAULT now(),
            PRIMARY KEY (plan_id, run_date, instrument_code)
        );

        CREATE TABLE IF NOT EXISTS dividend_records (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL REFERENCES instruments(code),
            nav_date date NOT NULL,
            dps numeric(28, 8) NOT NULL CHECK (dps > 0),
            mode text NOT NULL,
            status text NOT NULL,
            is_synthetic boolean NOT NULL,
            gross_cash numeric(20, 2) NULL,
            credited_units numeric(28, 8) NULL,
            credited_invested numeric(20, 2) NULL,
            order_id uuid NULL,
            pending_reason text NULL,
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS stock_trades (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL,
            stock_name text NULL,
            quantity numeric(28, 8) NOT NULL CHECK (quantity > 0),
            price numeric(20, 4) NOT NULL CHECK (price > 0),
            cost_cash numeric(20, 2) NOT NULL CHECK (cost_cash >= 0),
            is_synthetic boolean NOT NULL,
            executed_at timestamptz NOT NULL
        );

        CREATE TABLE IF NOT EXISTS stock_trade_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            trade_id uuid NOT NULL REFERENCES stock_trades(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS stock_positions (
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL,
            stock_name text NULL,
            quantity numeric(28, 8) NOT NULL CHECK (quantity > 0),
            cost_cash numeric(20, 2) NOT NULL CHECK (cost_cash >= 0),
            last_traded_at timestamptz NOT NULL,
            PRIMARY KEY (fund_id, instrument_code)
        );

        CREATE TABLE IF NOT EXISTS stock_sells (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL,
            stock_name text NULL,
            quantity numeric(28, 8) NOT NULL CHECK (quantity > 0),
            price numeric(20, 4) NOT NULL CHECK (price > 0),
            fee_amount numeric(20, 2) NOT NULL CHECK (fee_amount >= 0),
            proceeds numeric(20, 2) NOT NULL CHECK (proceeds >= 0),
            is_synthetic boolean NOT NULL,
            executed_at timestamptz NOT NULL
        );

        CREATE TABLE IF NOT EXISTS stock_cashflow_events (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL,
            stock_name text NULL,
            event_type text NOT NULL CHECK (event_type IN ('buy', 'sell', 'dividend')),
            event_date date NOT NULL,
            quantity numeric(28, 8) NOT NULL CHECK (quantity >= 0),
            amount numeric(20, 2) NOT NULL CHECK (amount >= 0),
            note text NULL,
            is_synthetic boolean NOT NULL,
            created_at timestamptz NOT NULL
        );

        CREATE TABLE IF NOT EXISTS stock_cashflow_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            event_id uuid NOT NULL REFERENCES stock_cashflow_events(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS stock_sell_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            sell_id uuid NOT NULL REFERENCES stock_sells(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS bond_trades (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL,
            bond_name text NULL,
            quantity numeric(28, 8) NOT NULL CHECK (quantity > 0),
            price numeric(20, 4) NOT NULL CHECK (price > 0),
            cost_cash numeric(20, 2) NOT NULL CHECK (cost_cash >= 0),
            is_synthetic boolean NOT NULL,
            executed_at timestamptz NOT NULL
        );

        ALTER TABLE bond_trades ADD COLUMN IF NOT EXISTS clean_price numeric(20, 4) NOT NULL DEFAULT 0;
        ALTER TABLE bond_trades ADD COLUMN IF NOT EXISTS accrued_interest numeric(20, 4) NOT NULL DEFAULT 0;
        ALTER TABLE bond_trades ADD COLUMN IF NOT EXISTS par_value numeric(20, 4) NOT NULL DEFAULT 100;
        ALTER TABLE bond_trades ADD COLUMN IF NOT EXISTS settlement_date date NOT NULL DEFAULT CURRENT_DATE;
        ALTER TABLE bond_trades ADD COLUMN IF NOT EXISTS coupon_rate numeric(12, 6) NULL;
        ALTER TABLE bond_trades ADD COLUMN IF NOT EXISTS value_date date NULL;
        ALTER TABLE bond_trades ADD COLUMN IF NOT EXISTS maturity_date date NULL;
        ALTER TABLE bond_trades ADD COLUMN IF NOT EXISTS trade_date date NOT NULL DEFAULT CURRENT_DATE;

        CREATE TABLE IF NOT EXISTS bond_trade_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            trade_id uuid NOT NULL REFERENCES bond_trades(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS bond_cashflow_events (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL,
            bond_name text NULL,
            event_type text NOT NULL CHECK (event_type IN ('coupon', 'maturity', 'redemption')),
            event_date date NOT NULL,
            quantity numeric(28, 8) NOT NULL CHECK (quantity > 0),
            amount numeric(20, 2) NOT NULL CHECK (amount >= 0),
            note text NULL,
            is_synthetic boolean NOT NULL,
            created_at timestamptz NOT NULL
        );

        ALTER TABLE bond_cashflow_events DROP CONSTRAINT IF EXISTS bond_cashflow_events_event_type_check;
        ALTER TABLE bond_cashflow_events ADD CONSTRAINT bond_cashflow_events_event_type_check CHECK (event_type IN ('coupon', 'maturity', 'redemption'));

        CREATE TABLE IF NOT EXISTS bond_cashflow_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            event_id uuid NOT NULL REFERENCES bond_cashflow_events(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS bond_sells (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL,
            bond_name text NULL,
            quantity numeric(28, 8) NOT NULL CHECK (quantity > 0),
            price numeric(20, 4) NOT NULL CHECK (price > 0),
            clean_price numeric(20, 4) NOT NULL DEFAULT 0,
            accrued_interest numeric(20, 4) NOT NULL DEFAULT 0,
            par_value numeric(20, 4) NOT NULL DEFAULT 100,
            settlement_date date NOT NULL DEFAULT CURRENT_DATE,
            trade_date date NOT NULL DEFAULT CURRENT_DATE,
            fee_amount numeric(20, 2) NOT NULL DEFAULT 0 CHECK (fee_amount >= 0),
            proceeds numeric(20, 2) NOT NULL DEFAULT 0,
            cost_released numeric(20, 2) NOT NULL DEFAULT 0,
            realized_pnl numeric(20, 2) NOT NULL DEFAULT 0,
            is_synthetic boolean NOT NULL,
            executed_at timestamptz NOT NULL
        );

        CREATE TABLE IF NOT EXISTS bond_sell_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            sell_id uuid NOT NULL REFERENCES bond_sells(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS bond_positions (
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL,
            bond_name text NULL,
            quantity numeric(28, 8) NOT NULL CHECK (quantity > 0),
            cost_cash numeric(20, 2) NOT NULL CHECK (cost_cash >= 0),
            last_traded_at timestamptz NOT NULL,
            PRIMARY KEY (fund_id, instrument_code)
        );

        CREATE TABLE IF NOT EXISTS instrument_snapshots (
            instrument_code text NOT NULL,
            asset_class text NOT NULL CHECK (asset_class IN ('stock', 'bond')),
            snapshot_date date NOT NULL,
            price numeric(28, 8) NOT NULL CHECK (price > 0),
            source text NOT NULL,
            source_revision text NOT NULL,
            source_collected_at timestamptz NOT NULL,
            source_payload_hash text NOT NULL,
            first_seen_at timestamptz NOT NULL DEFAULT now(),
            last_seen_at timestamptz NOT NULL DEFAULT now(),
            PRIMARY KEY (instrument_code, asset_class, snapshot_date)
        );

        CREATE INDEX IF NOT EXISTS instrument_snapshots_date_idx
            ON instrument_snapshots (instrument_code, asset_class, snapshot_date DESC);

        CREATE TABLE IF NOT EXISTS dividend_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            record_id uuid NOT NULL REFERENCES dividend_records(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS investment_plans (
            id uuid PRIMARY KEY,
            fund_id uuid NOT NULL REFERENCES funds(id),
            instrument_code text NOT NULL REFERENCES instruments(code),
            amount numeric(20, 2) NOT NULL CHECK (amount > 0),
            frequency text NOT NULL,
            status text NOT NULL,
            is_synthetic boolean NOT NULL,
            anchor_date date NOT NULL,
            next_run_date date NOT NULL,
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS investment_plan_idempotencies (
            idempotency_key text PRIMARY KEY,
            request_hash text NOT NULL,
            plan_id uuid NOT NULL REFERENCES investment_plans(id),
            fund_id uuid NOT NULL REFERENCES funds(id),
            created_at timestamptz NOT NULL DEFAULT now()
        );

        CREATE TABLE IF NOT EXISTS investment_plan_runs (
            plan_id uuid NOT NULL REFERENCES investment_plans(id),
            run_date date NOT NULL,
            amount numeric(20, 2) NOT NULL,
            fee_amount numeric(20, 2) NOT NULL,
            status text NOT NULL,
            order_id uuid NULL,
            pending_reason text NULL,
            executed_at timestamptz NOT NULL DEFAULT now(),
            PRIMARY KEY (plan_id, run_date)
        );
        """

    let statusText status =
        match status with
        | FundStatus.Empty -> "empty"
        | FundStatus.Active -> "active"
        | FundStatus.ZeroUnits -> "zero_units"

    let cashText (value: decimal) = value.ToString("0.00", CultureInfo.InvariantCulture)

    let decimalText (value: decimal) = value.ToString("0.00000000", CultureInfo.InvariantCulture)

    let recordFromLedger (fund: LedgerFund) =
        {
            Id = fund.Id
            Name = fund.Name
            Currency = fund.Currency
            InitialCash = fund.InitialCash
            InitialUnitNav = fund.InitialUnitNav
            IsSynthetic = fund.IsSynthetic
            AvailableCash = fund.AvailableCash
            ReservedCash = fund.FrozenCash
            Status = statusText fund.Status
            CreatedAt = DateTimeOffset.UtcNow
        }

    let recordFromReader (reader: DbDataReader) =
        {
            Id = reader.GetGuid(0)
            Name = reader.GetString(1)
            Currency = reader.GetString(2)
            InitialCash = reader.GetDecimal(3)
            InitialUnitNav = reader.GetDecimal(4)
            IsSynthetic = reader.GetBoolean(5)
            AvailableCash = reader.GetDecimal(6)
            ReservedCash = reader.GetDecimal(7)
            Status = reader.GetString(8)
            CreatedAt = reader.GetFieldValue<DateTimeOffset>(9)
        }

    let dateTimeOffsetFromReader (reader: DbDataReader) index =
        reader.GetFieldValue<DateTimeOffset>(index)

    let optionalDateTimeOffsetFromReader (reader: DbDataReader) index =
        if reader.IsDBNull(index) then None else Some(dateTimeOffsetFromReader reader index)

    let optionalDecimalFromReader (reader: DbDataReader) index =
        if reader.IsDBNull(index) then None else Some(reader.GetDecimal(index))

    let instrumentRecordFromReader (reader: DbDataReader) : MarketDataInstrumentRecord =
        {
            Code = reader.GetString(0)
            Name = reader.GetString(1)
            FundType = if reader.IsDBNull(2) then None else Some(reader.GetString(2))
            Source = reader.GetString(3)
            SourceRevision = reader.GetString(4)
            SourceCollectedAt = dateTimeOffsetFromReader reader 5
            SourcePayloadHash = reader.GetString(6)
            FirstSeenAt = dateTimeOffsetFromReader reader 7
            LastSeenAt = dateTimeOffsetFromReader reader 8
        }

    let navRecordFromReader (reader: DbDataReader) : MarketDataNavRecord =
        {
            Code = reader.GetString(0)
            NavDate = reader.GetFieldValue<DateOnly>(1)
            PublishedAt = optionalDateTimeOffsetFromReader reader 2
            Nav = reader.GetDecimal(3)
            AccumulatedNav = optionalDecimalFromReader reader 4
            DailyReturn = optionalDecimalFromReader reader 5
            Source = reader.GetString(6)
            SourceRevision = reader.GetString(7)
            SourceCollectedAt = dateTimeOffsetFromReader reader 8
            SourcePayloadHash = reader.GetString(9)
            FirstSeenAt = dateTimeOffsetFromReader reader 10
            LastSeenAt = dateTimeOffsetFromReader reader 11
        }

    let commandWithTransaction (connection: NpgsqlConnection) (transaction: NpgsqlTransaction option) sql =
        let command = connection.CreateCommand()
        command.CommandText <- sql

        match transaction with
        | Some value -> command.Transaction <- value
        | None -> ()

        command

    let addParameter (command: NpgsqlCommand) name dbType (value: obj) =
        let parameter = command.Parameters.Add(name, dbType)
        parameter.Value <- value
        parameter

    let optionalParameterValue value =
        match value with
        | Some actual -> box actual
        | None -> box DBNull.Value

    let findFund connection transaction fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT id, name, currency, initial_cash, initial_unit_nav,
                       is_synthetic, available_cash, reserved_cash, status, created_at
                FROM funds
                WHERE id = @fund_id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then Some(recordFromReader reader) else None

    let findIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id FROM fund_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then Some(reader.GetString(0), reader.GetGuid(1)) else None

    let insertFund connection transaction (fund: LedgerFund) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO funds
                    (id, name, currency, initial_cash, initial_unit_nav,
                     is_synthetic, available_cash, reserved_cash, status)
                VALUES
                    (@id, @name, @currency, @initial_cash, @initial_unit_nav,
                     @is_synthetic, @available_cash, @reserved_cash, @status)
                """

        addParameter command "id" NpgsqlDbType.Uuid (box fund.Id) |> ignore
        addParameter command "name" NpgsqlDbType.Text (box fund.Name) |> ignore
        addParameter command "currency" NpgsqlDbType.Text (box fund.Currency) |> ignore
        addParameter command "initial_cash" NpgsqlDbType.Numeric (box fund.InitialCash) |> ignore
        addParameter command "initial_unit_nav" NpgsqlDbType.Numeric (box fund.InitialUnitNav) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box fund.IsSynthetic) |> ignore
        addParameter command "available_cash" NpgsqlDbType.Numeric (box fund.AvailableCash) |> ignore
        addParameter command "reserved_cash" NpgsqlDbType.Numeric (box fund.FrozenCash) |> ignore
        addParameter command "status" NpgsqlDbType.Text (box (statusText fund.Status)) |> ignore
        command.ExecuteNonQuery() |> ignore

    let insertIdempotency connection transaction key requestHash fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO fund_idempotencies (idempotency_key, request_hash, fund_id)
                VALUES (@idempotency_key, @request_hash, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let orderStatusText = "submitted"

    let readStringOption (reader: DbDataReader) ordinal =
        if reader.IsDBNull ordinal then None else Some(reader.GetString ordinal)

    let readDecimalOption (reader: DbDataReader) ordinal =
        if reader.IsDBNull ordinal then None else Some(reader.GetDecimal ordinal)

    let orderRecordFromReader (reader: DbDataReader) : SubscriptionOrderRecord =
        let confirmedQuote =
            if reader.IsDBNull(13) then
                None
            else
                Some
                    {
                        Nav = reader.GetDecimal(13)
                        NavDate = reader.GetFieldValue<DateOnly>(14)
                        Source = reader.GetString(15)
                        Revision = reader.GetString(16)
                        CollectedAt = reader.GetFieldValue<DateTimeOffset>(17)
                        PublishedAt =
                            if reader.IsDBNull(18) then
                                None
                            else
                                Some(reader.GetFieldValue<DateTimeOffset>(18))
                        PayloadHash =
                            if reader.IsDBNull(19) then
                                ""
                            else
                                reader.GetString(19)
                        FirstSeenAt =
                            if reader.IsDBNull(20) then
                                DateTimeOffset.UnixEpoch
                            else
                                reader.GetFieldValue<DateTimeOffset>(20)
                    }

        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            FundCode = reader.GetString(2)
            Amount = reader.GetDecimal(3)
            FeeAmount = reader.GetDecimal(4)
            ReservedTotal = reader.GetDecimal(5)
            Status = reader.GetString(6)
            IsSynthetic = reader.GetBoolean(7)
            SubmittedAt = reader.GetFieldValue<DateTimeOffset>(8)
            TradeDate = reader.GetFieldValue<DateOnly>(9)
            ConfirmIdempotencyKey = readStringOption reader 10
            PendingReason = readStringOption reader 11
            ConfirmedAt =
                if reader.IsDBNull(12) then
                    None
                else
                    Some(reader.GetFieldValue<DateTimeOffset>(12))
            ConfirmedUnits = readDecimalOption reader 21
            ConfirmedQuote = confirmedQuote
            ConfirmedInvestedCash = readDecimalOption reader 22
            ConfirmedResidualCash = readDecimalOption reader 23
        }

    let findOrder connection transaction orderId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT id, fund_id, fund_code, amount, fee_amount,
                       reserved_total, status, is_synthetic, submitted_at,
                       trade_date,
                       confirm_idempotency_key, pending_reason, confirmed_at,
                       confirmed_nav, confirmed_nav_date, confirmed_nav_source,
                       confirmed_nav_revision, confirmed_nav_collected_at, confirmed_nav_published_at,
                       confirmed_nav_payload_hash, confirmed_nav_first_seen_at,
                       confirmed_units, confirmed_invested_cash, confirmed_residual_cash
                FROM subscription_orders
                WHERE id = @order_id
                """

        addParameter command "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then Some(orderRecordFromReader reader) else None

    let findConfirmIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id, order_id FROM subscription_confirm_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let findOrderIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id, order_id FROM subscription_order_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let instrumentExists connection transaction code =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT 1 FROM instruments WHERE code = @code"

        addParameter command "code" NpgsqlDbType.Text (box code) |> ignore

        use reader = command.ExecuteReader()
        reader.Read()

    let lockFundForOrder connection transaction fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT is_synthetic FROM funds WHERE id = @fund_id FOR UPDATE"

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then Some(reader.GetBoolean(0)) else None

    let insertSubscriptionOrder connection transaction (order: SubscriptionOrderRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO subscription_orders
                    (id, fund_id, fund_code, amount, fee_amount,
                     reserved_total, status, is_synthetic, trade_date)
                VALUES
                    (@id, @fund_id, @fund_code, @amount, @fee_amount,
                     @reserved_total, @status, @is_synthetic, @trade_date)
                RETURNING submitted_at
                """

        addParameter command "id" NpgsqlDbType.Uuid (box order.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box order.FundId) |> ignore
        addParameter command "fund_code" NpgsqlDbType.Text (box order.FundCode) |> ignore
        addParameter command "amount" NpgsqlDbType.Numeric (box order.Amount) |> ignore
        addParameter command "fee_amount" NpgsqlDbType.Numeric (box order.FeeAmount) |> ignore
        addParameter command "reserved_total" NpgsqlDbType.Numeric (box order.ReservedTotal) |> ignore
        addParameter command "status" NpgsqlDbType.Text (box order.Status) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box order.IsSynthetic) |> ignore
        addParameter command "trade_date" NpgsqlDbType.Date (box order.TradeDate) |> ignore

        use reader = command.ExecuteReader()
        reader.Read() |> ignore
        reader.GetFieldValue<DateTimeOffset>(0)

    let insertOrderIdempotency connection transaction key requestHash orderId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO subscription_order_idempotencies (idempotency_key, request_hash, order_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @order_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let upsertInstrument connection transaction (payload: MarketDataSearchPayload) payloadHash (instrument: MarketDataInstrument) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO instruments
                    (code, name, fund_type, source, source_revision,
                     source_collected_at, source_payload_hash)
                VALUES
                    (@code, @name, @fund_type, @source, @source_revision,
                     @source_collected_at, @source_payload_hash)
                ON CONFLICT (code) DO UPDATE SET
                    name = EXCLUDED.name,
                    fund_type = EXCLUDED.fund_type,
                    source = EXCLUDED.source,
                    source_revision = EXCLUDED.source_revision,
                    source_collected_at = EXCLUDED.source_collected_at,
                    source_payload_hash = EXCLUDED.source_payload_hash,
                    last_seen_at = now()
                """

        addParameter command "code" NpgsqlDbType.Text (box instrument.Code) |> ignore
        addParameter command "name" NpgsqlDbType.Text (box instrument.Name) |> ignore

        addParameter
            command
            "fund_type"
            NpgsqlDbType.Text
            (optionalParameterValue instrument.FundType)
        |> ignore

        addParameter command "source" NpgsqlDbType.Text (box payload.Source) |> ignore
        addParameter command "source_revision" NpgsqlDbType.Text (box payload.SourceRevision) |> ignore
        addParameter command "source_collected_at" NpgsqlDbType.TimestampTz (box payload.CollectedAt) |> ignore
        addParameter command "source_payload_hash" NpgsqlDbType.Text (box payloadHash) |> ignore
        command.ExecuteNonQuery() |> ignore

    let upsertNavObservation connection transaction (payload: MarketDataNavPayload) payloadHash (observation: MarketDataObservation) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO fund_nav_observations
                    (instrument_code, nav_date, published_at, nav, accumulated_nav,
                     daily_return, source, source_revision, source_collected_at,
                     source_payload_hash)
                VALUES
                    (@instrument_code, @nav_date, @published_at, @nav, @accumulated_nav,
                     @daily_return, @source, @source_revision, @source_collected_at,
                     @source_payload_hash)
                ON CONFLICT (instrument_code, nav_date) DO UPDATE SET
                    published_at = EXCLUDED.published_at,
                    nav = EXCLUDED.nav,
                    accumulated_nav = EXCLUDED.accumulated_nav,
                    daily_return = EXCLUDED.daily_return,
                    source = EXCLUDED.source,
                    source_revision = EXCLUDED.source_revision,
                    source_collected_at = EXCLUDED.source_collected_at,
                    source_payload_hash = EXCLUDED.source_payload_hash,
                    last_seen_at = now(),
                    first_seen_at =
                        CASE
                            WHEN fund_nav_observations.source_payload_hash = EXCLUDED.source_payload_hash
                                THEN fund_nav_observations.first_seen_at
                            ELSE now()
                        END
                """

        addParameter command "instrument_code" NpgsqlDbType.Text (box payload.Code) |> ignore
        addParameter command "nav_date" NpgsqlDbType.Date (box observation.NavDate) |> ignore

        addParameter
            command
            "published_at"
            NpgsqlDbType.TimestampTz
            (optionalParameterValue observation.PublishedAt)
        |> ignore

        addParameter command "nav" NpgsqlDbType.Numeric (box observation.Nav) |> ignore

        addParameter
            command
            "accumulated_nav"
            NpgsqlDbType.Numeric
            (optionalParameterValue observation.AccumulatedNav)
        |> ignore

        addParameter
            command
            "daily_return"
            NpgsqlDbType.Numeric
            (optionalParameterValue observation.DailyReturn)
        |> ignore

        addParameter command "source" NpgsqlDbType.Text (box payload.Source) |> ignore
        addParameter command "source_revision" NpgsqlDbType.Text (box payload.SourceRevision) |> ignore
        addParameter command "source_collected_at" NpgsqlDbType.TimestampTz (box payload.CollectedAt) |> ignore
        addParameter command "source_payload_hash" NpgsqlDbType.Text (box payloadHash) |> ignore
        command.ExecuteNonQuery() |> ignore

        use evidenceCommand =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO fund_nav_observation_evidence
                    (instrument_code, nav_date, source_payload_hash, source_revision, source,
                     source_collected_at, published_at, nav)
                VALUES
                    (@instrument_code, @nav_date, @source_payload_hash, @source_revision, @source,
                     @source_collected_at, @published_at, @nav)
                ON CONFLICT (instrument_code, nav_date, source_payload_hash) DO NOTHING
                """

        addParameter evidenceCommand "instrument_code" NpgsqlDbType.Text (box payload.Code) |> ignore
        addParameter evidenceCommand "nav_date" NpgsqlDbType.Date (box observation.NavDate) |> ignore
        addParameter evidenceCommand "source_payload_hash" NpgsqlDbType.Text (box payloadHash) |> ignore
        addParameter evidenceCommand "source_revision" NpgsqlDbType.Text (box payload.SourceRevision) |> ignore
        addParameter evidenceCommand "source" NpgsqlDbType.Text (box payload.Source) |> ignore
        addParameter evidenceCommand "source_collected_at" NpgsqlDbType.TimestampTz (box payload.CollectedAt) |> ignore

        addParameter
            evidenceCommand
            "published_at"
            NpgsqlDbType.TimestampTz
            (optionalParameterValue observation.PublishedAt)
        |> ignore

        addParameter evidenceCommand "nav" NpgsqlDbType.Numeric (box observation.Nav) |> ignore
        evidenceCommand.ExecuteNonQuery() |> ignore

    let requestHash (command: FundCreateCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let name = if isNull command.Name then "" else command.Name
        let payload =
            String.concat
                "|"
                [
                    "fund-create"
                    encoded name
                    (encoded (command.InitialCash.ToString("G29", invariant)))
                    (encoded (command.InitialUnitNav.ToString("G29", invariant)))
                    (encoded (command.IsSynthetic.ToString()))
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let validateStorageRange (command: FundCreateCommand) =
        if command.InitialCash > cashMaximum then
            Error "initial cash exceeds database precision"
        elif command.InitialUnitNav > unitNavMaximum then
            Error "initial unit NAV exceeds database precision"
        else
            Ok()

    let orderRequestHash (fundId: Guid) (command: SubscriptionOrderCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let fundCode = if isNull command.FundCode then "" else command.FundCode
        let payload =
            String.concat
                "|"
                [
                    "subscription-order"
                    encoded (fundId.ToString("D"))
                    encoded fundCode
                    (encoded (command.Amount.ToString("G29", invariant)))
                    (encoded (command.FeeAmount.ToString("G29", invariant)))
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let validateOrderCommand (command: SubscriptionOrderCommand) =
        if String.IsNullOrWhiteSpace command.FundCode then
            Error "fund code cannot be empty"
        elif command.Amount <= 0m then
            Error "amount must be positive"
        elif command.FeeAmount < 0m then
            Error "fee amount cannot be negative"
        elif Decimal.Round(command.Amount, 2) <> command.Amount then
            Error "amount exceeds cash precision"
        elif Decimal.Round(command.FeeAmount, 2) <> command.FeeAmount then
            Error "fee amount exceeds cash precision"
        elif command.Amount > cashMaximum then
            Error "amount exceeds database precision"
        elif command.FeeAmount > cashMaximum then
            Error "fee amount exceeds database precision"
        elif command.Amount + command.FeeAmount > cashMaximum then
            Error "reserved total exceeds database precision"
        else
            Ok()

    let ledgerErrorMessage error =
        match error with
        | InvalidIdentifier label -> sprintf "%s is invalid" label
        | InvalidAmount label -> sprintf "%s is invalid" label
        | InvalidPrecision label -> sprintf "%s has invalid precision" label
        | InvalidState message -> message
        | FundAlreadyExists fundId -> sprintf "fund %O already exists" fundId
        | other -> sprintf "%A" other

    let redemptionRecordFromReader (reader: DbDataReader) : RedemptionOrderRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            Units = reader.GetDecimal(3)
            FeeAmount = reader.GetDecimal(4)
            Status = reader.GetString(5)
            IsSynthetic = reader.GetBoolean(6)
            SubmittedAt = reader.GetFieldValue<DateTimeOffset>(7)
            TradeDate = reader.GetFieldValue<DateOnly>(8)
            ConfirmIdempotencyKey = readStringOption reader 9
            PendingReason = readStringOption reader 10
            ConfirmedAt = optionalDateTimeOffsetFromReader reader 11
            ConfirmedNav = readDecimalOption reader 12
            ConfirmedNavDate =
                if reader.IsDBNull(13) then
                    None
                else
                    Some(reader.GetFieldValue<DateOnly>(13))
            ConfirmedProceeds = readDecimalOption reader 14
            ConfirmedCostReleased = readDecimalOption reader 15
        }

    let redemptionOrderColumns =
        """
        SELECT id, fund_id, instrument_code, units, fee_amount,
               status, is_synthetic, submitted_at, trade_date,
               confirm_idempotency_key, pending_reason, confirmed_at,
               confirmed_nav, confirmed_nav_date, confirmed_proceeds, confirmed_cost_released
        FROM redemption_orders
        """

    let findRedemptionOrder connection transaction orderId =
        use command =
            commandWithTransaction connection transaction (redemptionOrderColumns + " WHERE id = @order_id")

        addParameter command "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then Some(redemptionRecordFromReader reader) else None

    let findRedemptionOrderIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id, order_id FROM redemption_order_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let findRedemptionConfirmIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id, order_id FROM redemption_confirm_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let insertRedemptionOrder connection transaction (order: RedemptionOrderRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO redemption_orders
                    (id, fund_id, instrument_code, units, fee_amount,
                     status, is_synthetic, trade_date)
                VALUES
                    (@id, @fund_id, @instrument_code, @units, @fee_amount,
                     @status, @is_synthetic, @trade_date)
                RETURNING submitted_at
                """

        addParameter command "id" NpgsqlDbType.Uuid (box order.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box order.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box order.InstrumentCode) |> ignore
        addParameter command "units" NpgsqlDbType.Numeric (box order.Units) |> ignore
        addParameter command "fee_amount" NpgsqlDbType.Numeric (box order.FeeAmount) |> ignore
        addParameter command "status" NpgsqlDbType.Text (box order.Status) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box order.IsSynthetic) |> ignore
        addParameter command "trade_date" NpgsqlDbType.Date (box order.TradeDate) |> ignore

        use reader = command.ExecuteReader()
        reader.Read() |> ignore
        reader.GetFieldValue<DateTimeOffset>(0)

    let insertRedemptionOrderIdempotency connection transaction key requestHash orderId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO redemption_order_idempotencies (idempotency_key, request_hash, order_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @order_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let insertRedemptionConfirmIdempotency connection transaction key requestHash orderId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO redemption_confirm_idempotencies (idempotency_key, request_hash, order_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @order_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let redemptionRequestHash (fundId: Guid) (command: RedemptionCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let code = if isNull command.InstrumentCode then "" else command.InstrumentCode
        let payload =
            String.concat
                "|"
                [
                    "redemption-order"
                    encoded (fundId.ToString("D"))
                    encoded code
                    (encoded (command.Units.ToString("G29", invariant)))
                    (encoded (command.FeeAmount.ToString("G29", invariant)))
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let validateRedemptionCommand (command: RedemptionCommand) =
        if String.IsNullOrWhiteSpace command.InstrumentCode then
            Error "instrument code cannot be empty"
        elif command.Units <= 0m then
            Error "units must be positive"
        elif command.FeeAmount < 0m then
            Error "fee amount cannot be negative"
        elif Decimal.Round(command.Units, 8) <> command.Units then
            Error "units exceed supported precision"
        elif Decimal.Round(command.FeeAmount, 2) <> command.FeeAmount then
            Error "fee amount exceeds cash precision"
        elif command.Units > RedemptionPolicy.unitsMaximum then
            Error "units exceed database precision"
        elif command.FeeAmount > cashMaximum then
            Error "fee amount exceeds database precision"
        else
            Ok()

    let capitalDepositRecordFromReader (reader: DbDataReader) : CapitalDepositRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            Amount = reader.GetDecimal(2)
            Note = readStringOption reader 3
            IsSynthetic = reader.GetBoolean(4)
            CreatedAt = reader.GetFieldValue<DateTimeOffset>(5)
        }

    let findCapitalDeposit connection transaction depositId =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT id, fund_id, amount, note, is_synthetic, created_at FROM fund_capital_deposits WHERE id = @deposit_id"

        addParameter command "deposit_id" NpgsqlDbType.Uuid (box depositId) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then Some(capitalDepositRecordFromReader reader) else None

    let findCapitalDepositIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id, deposit_id FROM fund_capital_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let insertCapitalDeposit connection transaction (deposit: CapitalDepositRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO fund_capital_deposits (id, fund_id, amount, note, is_synthetic)
                VALUES (@id, @fund_id, @amount, @note, @is_synthetic)
                RETURNING created_at
                """

        addParameter command "id" NpgsqlDbType.Uuid (box deposit.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box deposit.FundId) |> ignore
        addParameter command "amount" NpgsqlDbType.Numeric (box deposit.Amount) |> ignore

        let noteParameter =
            match deposit.Note with
            | Some note -> box note
            | None -> box DBNull.Value

        addParameter command "note" NpgsqlDbType.Text noteParameter |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box deposit.IsSynthetic) |> ignore

        use reader = command.ExecuteReader()
        reader.Read() |> ignore
        reader.GetFieldValue<DateTimeOffset>(0)

    let insertCapitalDepositIdempotency connection transaction key requestHash depositId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO fund_capital_idempotencies (idempotency_key, request_hash, deposit_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @deposit_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "deposit_id" NpgsqlDbType.Uuid (box depositId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let capitalDepositRequestHash (fundId: Guid) (command: CapitalDepositCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let note = if command.Note.IsNone then "" else command.Note.Value

        let payload =
            String.concat
                "|"
                [
                    "capital-deposit"
                    encoded (fundId.ToString("D"))
                    (encoded (command.Amount.ToString("G29", invariant)))
                    (encoded note)
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let stockTradeRecordFromReader (reader: DbDataReader) : StockTradeRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            StockName = if reader.IsDBNull(3) then None else Some(reader.GetString(3))
            Quantity = reader.GetDecimal(4)
            Price = reader.GetDecimal(5)
            CostCash = reader.GetDecimal(6)
            IsSynthetic = reader.GetBoolean(7)
            ExecutedAt = reader.GetFieldValue<DateTimeOffset>(8)
        }

    let insertStockTrade connection transaction (trade: StockTradeRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO stock_trades
                    (id, fund_id, instrument_code, stock_name, quantity, price, cost_cash, is_synthetic, executed_at)
                VALUES
                    (@id, @fund_id, @instrument_code, @stock_name, @quantity, @price, @cost_cash, @is_synthetic, @executed_at)
                """

        addParameter command "id" NpgsqlDbType.Uuid (box trade.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box trade.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box trade.InstrumentCode) |> ignore

        let nameParameter =
            match trade.StockName with
            | Some name -> box name
            | None -> box DBNull.Value

        addParameter command "stock_name" NpgsqlDbType.Text nameParameter |> ignore
        addParameter command "quantity" NpgsqlDbType.Numeric (box trade.Quantity) |> ignore
        addParameter command "price" NpgsqlDbType.Numeric (box trade.Price) |> ignore
        addParameter command "cost_cash" NpgsqlDbType.Numeric (box trade.CostCash) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box trade.IsSynthetic) |> ignore
        addParameter command "executed_at" NpgsqlDbType.TimestampTz (box trade.ExecutedAt) |> ignore
        command.ExecuteNonQuery() |> ignore

    let insertStockTradeIdempotency connection transaction key requestHash tradeId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO stock_trade_idempotencies (idempotency_key, request_hash, trade_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @trade_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "trade_id" NpgsqlDbType.Uuid (box tradeId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let findStockTradeIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT request_hash, fund_id, trade_id
                FROM stock_trade_idempotencies
                WHERE idempotency_key = @idempotency_key
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let findStockTrade connection transaction tradeId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT id, fund_id, instrument_code, stock_name, quantity, price, cost_cash, is_synthetic, executed_at
                FROM stock_trades
                WHERE id = @id
                """

        addParameter command "id" NpgsqlDbType.Uuid (box tradeId) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(stockTradeRecordFromReader reader)
        else
            None

    let stockTradeRequestHash (fundId: Guid) (command: StockTradeCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let name = command.StockName |> Option.defaultValue ""

        let payload =
            String.concat
                "|"
                [
                    "stock-trade"
                    encoded (fundId.ToString("D"))
                    encoded command.InstrumentCode
                    encoded name
                    encoded (command.Quantity.ToString("G29", invariant))
                    encoded (command.Price.ToString("G29", invariant))
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let stockSellRecordFromReader (reader: DbDataReader) : StockSellRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            StockName = if reader.IsDBNull(3) then None else Some(reader.GetString(3))
            Quantity = reader.GetDecimal(4)
            Price = reader.GetDecimal(5)
            FeeAmount = reader.GetDecimal(6)
            Proceeds = reader.GetDecimal(7)
            IsSynthetic = reader.GetBoolean(8)
            ExecutedAt = reader.GetFieldValue<DateTimeOffset>(9)
        }

    let insertStockSell connection transaction (sell: StockSellRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO stock_sells
                    (id, fund_id, instrument_code, stock_name, quantity, price, fee_amount, proceeds, is_synthetic, executed_at)
                VALUES
                    (@id, @fund_id, @instrument_code, @stock_name, @quantity, @price, @fee_amount, @proceeds, @is_synthetic, @executed_at)
                """

        addParameter command "id" NpgsqlDbType.Uuid (box sell.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box sell.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box sell.InstrumentCode) |> ignore

        let nameParameter =
            match sell.StockName with
            | Some name -> box name
            | None -> box DBNull.Value

        addParameter command "stock_name" NpgsqlDbType.Text nameParameter |> ignore
        addParameter command "quantity" NpgsqlDbType.Numeric (box sell.Quantity) |> ignore
        addParameter command "price" NpgsqlDbType.Numeric (box sell.Price) |> ignore
        addParameter command "fee_amount" NpgsqlDbType.Numeric (box sell.FeeAmount) |> ignore
        addParameter command "proceeds" NpgsqlDbType.Numeric (box sell.Proceeds) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box sell.IsSynthetic) |> ignore
        addParameter command "executed_at" NpgsqlDbType.TimestampTz (box sell.ExecutedAt) |> ignore
        command.ExecuteNonQuery() |> ignore

    let insertStockSellIdempotency connection transaction key requestHash sellId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO stock_sell_idempotencies (idempotency_key, request_hash, sell_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @sell_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "sell_id" NpgsqlDbType.Uuid (box sellId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let findStockSellIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT request_hash, fund_id, sell_id
                FROM stock_sell_idempotencies
                WHERE idempotency_key = @idempotency_key
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let findStockSell connection transaction sellId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT id, fund_id, instrument_code, stock_name, quantity, price, fee_amount, proceeds, is_synthetic, executed_at
                FROM stock_sells
                WHERE id = @id
                """

        addParameter command "id" NpgsqlDbType.Uuid (box sellId) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(stockSellRecordFromReader reader)
        else
            None

    let stockSellRequestHash (fundId: Guid) (command: StockSellCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let name = command.StockName |> Option.defaultValue ""

        let payload =
            String.concat
                "|"
                [
                    "stock-sell"
                    encoded (fundId.ToString("D"))
                    encoded command.InstrumentCode
                    encoded name
                    encoded (command.Quantity.ToString("G29", invariant))
                    encoded (command.Price.ToString("G29", invariant))
                    encoded (command.FeeAmount.ToString("G29", invariant))
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let stockCashflowRecordFromReader (reader: DbDataReader) : StockCashflowRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            StockName = if reader.IsDBNull(3) then None else Some(reader.GetString(3))
            EventType = reader.GetString(4)
            EventDate = reader.GetFieldValue<DateOnly>(5)
            Quantity = reader.GetDecimal(6)
            Amount = reader.GetDecimal(7)
            Note = readStringOption reader 8
            IsSynthetic = reader.GetBoolean(9)
            CreatedAt = reader.GetFieldValue<DateTimeOffset>(10)
        }

    let stockCashflowColumns =
        "id, fund_id, instrument_code, stock_name, event_type, event_date, quantity, amount, note, is_synthetic, created_at"

    let insertStockCashflow connection transaction (record: StockCashflowRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO stock_cashflow_events
                    (id, fund_id, instrument_code, stock_name, event_type, event_date, quantity, amount, note, is_synthetic, created_at)
                VALUES
                    (@id, @fund_id, @instrument_code, @stock_name, @event_type, @event_date, @quantity, @amount, @note, @is_synthetic, @created_at)
                """

        addParameter command "id" NpgsqlDbType.Uuid (box record.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box record.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box record.InstrumentCode) |> ignore

        let nameParameter =
            match record.StockName with
            | Some name -> box name
            | None -> box DBNull.Value

        addParameter command "stock_name" NpgsqlDbType.Text nameParameter |> ignore
        addParameter command "event_type" NpgsqlDbType.Text (box record.EventType) |> ignore
        addParameter command "event_date" NpgsqlDbType.Date (box record.EventDate) |> ignore
        addParameter command "quantity" NpgsqlDbType.Numeric (box record.Quantity) |> ignore
        addParameter command "amount" NpgsqlDbType.Numeric (box record.Amount) |> ignore

        let noteParameter =
            match record.Note with
            | Some note -> box note
            | None -> box DBNull.Value

        addParameter command "note" NpgsqlDbType.Text noteParameter |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box record.IsSynthetic) |> ignore
        addParameter command "created_at" NpgsqlDbType.TimestampTz (box record.CreatedAt) |> ignore
        command.ExecuteNonQuery() |> ignore

    let insertStockCashflowIdempotency connection transaction key requestHash eventId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO stock_cashflow_idempotencies (idempotency_key, request_hash, event_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @event_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "event_id" NpgsqlDbType.Uuid (box eventId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let findStockCashflowIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT request_hash, fund_id, event_id
                FROM stock_cashflow_idempotencies
                WHERE idempotency_key = @idempotency_key
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let findStockCashflow connection transaction eventId =
        use command =
            commandWithTransaction
                connection
                transaction
                $"""
                SELECT {stockCashflowColumns}
                FROM stock_cashflow_events
                WHERE id = @id
                """

        addParameter command "id" NpgsqlDbType.Uuid (box eventId) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(stockCashflowRecordFromReader reader)
        else
            None

    let stockCashflowRequestHash (fundId: Guid) (command: StockCashflowCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let name = command.StockName |> Option.defaultValue ""
        let note = command.Note |> Option.defaultValue ""

        let payload =
            String.concat
                "|"
                [
                    "stock-cashflow"
                    encoded (fundId.ToString("D"))
                    encoded command.InstrumentCode
                    encoded name
                    encoded command.EventType
                    encoded (command.EventDate.ToString("yyyy-MM-dd", invariant))
                    encoded (command.Quantity.ToString("G29", invariant))
                    encoded (command.Amount.ToString("G29", invariant))
                    encoded note
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let stockCashflowEvent
        (fundId: Guid)
        (instrumentCode: string)
        (stockName: string option)
        (eventType: string)
        (eventDate: DateOnly)
        (quantity: decimal)
        (amount: decimal)
        (note: string option)
        (isSynthetic: bool)
        : StockCashflowRecord =
        {
            Id = Guid.NewGuid()
            FundId = fundId
            InstrumentCode = instrumentCode
            StockName = stockName
            EventType = eventType
            EventDate = eventDate
            Quantity = quantity
            Amount = amount
            Note = note
            IsSynthetic = isSynthetic
            CreatedAt = DateTimeOffset.UtcNow
        }

    let bondTradeRecordFromReader (reader: DbDataReader) : BondTradeRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            BondName = if reader.IsDBNull(3) then None else Some(reader.GetString(3))
            Quantity = reader.GetDecimal(4)
            Price = reader.GetDecimal(5)
            CleanPrice = reader.GetDecimal(6)
            AccruedInterest = reader.GetDecimal(7)
            ParValue = reader.GetDecimal(8)
            SettlementDate = reader.GetFieldValue<DateOnly>(9)
            CouponRate = readDecimalOption reader 10
            ValueDate = if reader.IsDBNull(11) then None else Some(reader.GetFieldValue<DateOnly>(11))
            MaturityDate = if reader.IsDBNull(12) then None else Some(reader.GetFieldValue<DateOnly>(12))
            TradeDate = reader.GetFieldValue<DateOnly>(13)
            CostCash = reader.GetDecimal(14)
            IsSynthetic = reader.GetBoolean(15)
            ExecutedAt = reader.GetFieldValue<DateTimeOffset>(16)
        }

    let bondTradeColumns =
        "id, fund_id, instrument_code, bond_name, quantity, price, clean_price, accrued_interest, par_value, settlement_date, coupon_rate, value_date, maturity_date, trade_date, cost_cash, is_synthetic, executed_at"

    let insertBondTrade connection transaction (trade: BondTradeRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO bond_trades
                    (id, fund_id, instrument_code, bond_name, quantity, price, clean_price, accrued_interest,
                     par_value, settlement_date, coupon_rate, value_date, maturity_date, trade_date, cost_cash,
                     is_synthetic, executed_at)
                VALUES
                    (@id, @fund_id, @instrument_code, @bond_name, @quantity, @price, @clean_price, @accrued_interest,
                     @par_value, @settlement_date, @coupon_rate, @value_date, @maturity_date, @trade_date, @cost_cash,
                     @is_synthetic, @executed_at)
                """

        addParameter command "id" NpgsqlDbType.Uuid (box trade.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box trade.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box trade.InstrumentCode) |> ignore

        let nameParameter =
            match trade.BondName with
            | Some name -> box name
            | None -> box DBNull.Value

        addParameter command "bond_name" NpgsqlDbType.Text nameParameter |> ignore
        addParameter command "quantity" NpgsqlDbType.Numeric (box trade.Quantity) |> ignore
        addParameter command "price" NpgsqlDbType.Numeric (box trade.Price) |> ignore
        addParameter command "clean_price" NpgsqlDbType.Numeric (box trade.CleanPrice) |> ignore
        addParameter command "accrued_interest" NpgsqlDbType.Numeric (box trade.AccruedInterest) |> ignore
        addParameter command "par_value" NpgsqlDbType.Numeric (box trade.ParValue) |> ignore
        addParameter command "settlement_date" NpgsqlDbType.Date (box trade.SettlementDate) |> ignore

        let couponParameter =
            match trade.CouponRate with
            | Some value -> box value
            | None -> box DBNull.Value

        addParameter command "coupon_rate" NpgsqlDbType.Numeric couponParameter |> ignore

        let valueDateParameter =
            match trade.ValueDate with
            | Some value -> box value
            | None -> box DBNull.Value

        addParameter command "value_date" NpgsqlDbType.Date valueDateParameter |> ignore

        let maturityParameter =
            match trade.MaturityDate with
            | Some value -> box value
            | None -> box DBNull.Value

        addParameter command "maturity_date" NpgsqlDbType.Date maturityParameter |> ignore
        addParameter command "trade_date" NpgsqlDbType.Date (box trade.TradeDate) |> ignore
        addParameter command "cost_cash" NpgsqlDbType.Numeric (box trade.CostCash) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box trade.IsSynthetic) |> ignore
        addParameter command "executed_at" NpgsqlDbType.TimestampTz (box trade.ExecutedAt) |> ignore
        command.ExecuteNonQuery() |> ignore

    let insertBondTradeIdempotency connection transaction key requestHash tradeId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO bond_trade_idempotencies (idempotency_key, request_hash, trade_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @trade_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "trade_id" NpgsqlDbType.Uuid (box tradeId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let findBondTradeIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT request_hash, fund_id, trade_id
                FROM bond_trade_idempotencies
                WHERE idempotency_key = @idempotency_key
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let findBondTrade connection transaction tradeId =
        use command =
            commandWithTransaction
                connection
                transaction
                $"""
                SELECT {bondTradeColumns}
                FROM bond_trades
                WHERE id = @id
                """

        addParameter command "id" NpgsqlDbType.Uuid (box tradeId) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(bondTradeRecordFromReader reader)
        else
            None

    let bondTradeRequestHash (fundId: Guid) (command: BondTradeCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let name = command.BondName |> Option.defaultValue ""
        let dateText (value: DateOnly) = value.ToString("yyyy-MM-dd", invariant)
        let optionDate = command.ValueDate |> Option.map dateText |> Option.defaultValue ""
        let optionMaturity = command.MaturityDate |> Option.map dateText |> Option.defaultValue ""
        let optionCoupon = command.CouponRate |> Option.map (fun v -> v.ToString("G29", invariant)) |> Option.defaultValue ""
        let optionTradeDate = command.TradeDate |> Option.map dateText |> Option.defaultValue ""

        let payload =
            String.concat
                "|"
                [
                    "bond-trade"
                    encoded (fundId.ToString("D"))
                    encoded command.InstrumentCode
                    encoded name
                    encoded (command.Quantity.ToString("G29", invariant))
                    encoded (command.Price.ToString("G29", invariant))
                    encoded (command.CleanPrice.ToString("G29", invariant))
                    encoded (command.AccruedInterest.ToString("G29", invariant))
                    encoded (command.ParValue.ToString("G29", invariant))
                    encoded (dateText command.SettlementDate)
                    encoded optionTradeDate
                    encoded optionCoupon
                    encoded optionDate
                    encoded optionMaturity
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let bondCashflowRecordFromReader (reader: DbDataReader) : BondCashflowRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            BondName = if reader.IsDBNull(3) then None else Some(reader.GetString(3))
            EventType = reader.GetString(4)
            EventDate = reader.GetFieldValue<DateOnly>(5)
            Quantity = reader.GetDecimal(6)
            Amount = reader.GetDecimal(7)
            Note = readStringOption reader 8
            IsSynthetic = reader.GetBoolean(9)
            CreatedAt = reader.GetFieldValue<DateTimeOffset>(10)
        }

    let bondCashflowColumns =
        "id, fund_id, instrument_code, bond_name, event_type, event_date, quantity, amount, note, is_synthetic, created_at"

    let insertBondCashflow connection transaction (record: BondCashflowRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO bond_cashflow_events
                    (id, fund_id, instrument_code, bond_name, event_type, event_date, quantity, amount, note, is_synthetic, created_at)
                VALUES
                    (@id, @fund_id, @instrument_code, @bond_name, @event_type, @event_date, @quantity, @amount, @note, @is_synthetic, @created_at)
                """

        addParameter command "id" NpgsqlDbType.Uuid (box record.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box record.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box record.InstrumentCode) |> ignore

        let nameParameter =
            match record.BondName with
            | Some name -> box name
            | None -> box DBNull.Value

        addParameter command "bond_name" NpgsqlDbType.Text nameParameter |> ignore
        addParameter command "event_type" NpgsqlDbType.Text (box record.EventType) |> ignore
        addParameter command "event_date" NpgsqlDbType.Date (box record.EventDate) |> ignore
        addParameter command "quantity" NpgsqlDbType.Numeric (box record.Quantity) |> ignore
        addParameter command "amount" NpgsqlDbType.Numeric (box record.Amount) |> ignore

        let noteParameter =
            match record.Note with
            | Some note -> box note
            | None -> box DBNull.Value

        addParameter command "note" NpgsqlDbType.Text noteParameter |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box record.IsSynthetic) |> ignore
        addParameter command "created_at" NpgsqlDbType.TimestampTz (box record.CreatedAt) |> ignore
        command.ExecuteNonQuery() |> ignore

    let insertBondCashflowIdempotency connection transaction key requestHash eventId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO bond_cashflow_idempotencies (idempotency_key, request_hash, event_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @event_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "event_id" NpgsqlDbType.Uuid (box eventId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let findBondCashflowIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT request_hash, fund_id, event_id
                FROM bond_cashflow_idempotencies
                WHERE idempotency_key = @idempotency_key
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let findBondCashflow connection transaction eventId =
        use command =
            commandWithTransaction
                connection
                transaction
                $"""
                SELECT {bondCashflowColumns}
                FROM bond_cashflow_events
                WHERE id = @id
                """

        addParameter command "id" NpgsqlDbType.Uuid (box eventId) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(bondCashflowRecordFromReader reader)
        else
            None

    let bondCashflowRequestHash (fundId: Guid) (command: BondCashflowCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let name = command.BondName |> Option.defaultValue ""
        let note = command.Note |> Option.defaultValue ""

        let payload =
            String.concat
                "|"
                [
                    "bond-cashflow"
                    encoded (fundId.ToString("D"))
                    encoded command.InstrumentCode
                    encoded name
                    encoded command.EventType
                    encoded (command.EventDate.ToString("yyyy-MM-dd", invariant))
                    encoded (command.Quantity.ToString("G29", invariant))
                    encoded (command.Amount.ToString("G29", invariant))
                    encoded note
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let bondSellRecordFromReader (reader: DbDataReader) : BondSellRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            BondName = if reader.IsDBNull(3) then None else Some(reader.GetString(3))
            Quantity = reader.GetDecimal(4)
            Price = reader.GetDecimal(5)
            CleanPrice = reader.GetDecimal(6)
            AccruedInterest = reader.GetDecimal(7)
            ParValue = reader.GetDecimal(8)
            SettlementDate = reader.GetFieldValue<DateOnly>(9)
            TradeDate = reader.GetFieldValue<DateOnly>(10)
            FeeAmount = reader.GetDecimal(11)
            Proceeds = reader.GetDecimal(12)
            CostReleased = reader.GetDecimal(13)
            RealizedPnl = reader.GetDecimal(14)
            IsSynthetic = reader.GetBoolean(15)
            ExecutedAt = reader.GetFieldValue<DateTimeOffset>(16)
        }

    let bondSellColumns =
        "id, fund_id, instrument_code, bond_name, quantity, price, clean_price, accrued_interest, par_value, settlement_date, trade_date, fee_amount, proceeds, cost_released, realized_pnl, is_synthetic, executed_at"

    let insertBondSell connection transaction (record: BondSellRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO bond_sells
                    (id, fund_id, instrument_code, bond_name, quantity, price, clean_price, accrued_interest,
                     par_value, settlement_date, trade_date, fee_amount, proceeds, cost_released, realized_pnl,
                     is_synthetic, executed_at)
                VALUES
                    (@id, @fund_id, @instrument_code, @bond_name, @quantity, @price, @clean_price, @accrued_interest,
                     @par_value, @settlement_date, @trade_date, @fee_amount, @proceeds, @cost_released, @realized_pnl,
                     @is_synthetic, @executed_at)
                """

        addParameter command "id" NpgsqlDbType.Uuid (box record.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box record.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box record.InstrumentCode) |> ignore

        let nameParameter =
            match record.BondName with
            | Some name -> box name
            | None -> box DBNull.Value

        addParameter command "bond_name" NpgsqlDbType.Text nameParameter |> ignore
        addParameter command "quantity" NpgsqlDbType.Numeric (box record.Quantity) |> ignore
        addParameter command "price" NpgsqlDbType.Numeric (box record.Price) |> ignore
        addParameter command "clean_price" NpgsqlDbType.Numeric (box record.CleanPrice) |> ignore
        addParameter command "accrued_interest" NpgsqlDbType.Numeric (box record.AccruedInterest) |> ignore
        addParameter command "par_value" NpgsqlDbType.Numeric (box record.ParValue) |> ignore
        addParameter command "settlement_date" NpgsqlDbType.Date (box record.SettlementDate) |> ignore
        addParameter command "trade_date" NpgsqlDbType.Date (box record.TradeDate) |> ignore
        addParameter command "fee_amount" NpgsqlDbType.Numeric (box record.FeeAmount) |> ignore
        addParameter command "proceeds" NpgsqlDbType.Numeric (box record.Proceeds) |> ignore
        addParameter command "cost_released" NpgsqlDbType.Numeric (box record.CostReleased) |> ignore
        addParameter command "realized_pnl" NpgsqlDbType.Numeric (box record.RealizedPnl) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box record.IsSynthetic) |> ignore
        addParameter command "executed_at" NpgsqlDbType.TimestampTz (box record.ExecutedAt) |> ignore
        command.ExecuteNonQuery() |> ignore

    let insertBondSellIdempotency connection transaction key requestHash sellId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO bond_sell_idempotencies (idempotency_key, request_hash, sell_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @sell_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "sell_id" NpgsqlDbType.Uuid (box sellId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let findBondSellIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT request_hash, fund_id, sell_id
                FROM bond_sell_idempotencies
                WHERE idempotency_key = @idempotency_key
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let findBondSell connection transaction sellId =
        use command =
            commandWithTransaction
                connection
                transaction
                $"""
                SELECT {bondSellColumns}
                FROM bond_sells
                WHERE id = @id
                """

        addParameter command "id" NpgsqlDbType.Uuid (box sellId) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            Some(bondSellRecordFromReader reader)
        else
            None

    let bondSellRequestHash (fundId: Guid) (command: BondSellCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let name = command.BondName |> Option.defaultValue ""
        let dateText (value: DateOnly) = value.ToString("yyyy-MM-dd", invariant)
        let optionTradeDate = command.TradeDate |> Option.map dateText |> Option.defaultValue ""

        let payload =
            String.concat
                "|"
                [
                    "bond-sell"
                    encoded (fundId.ToString("D"))
                    encoded command.InstrumentCode
                    encoded name
                    encoded (command.Quantity.ToString("G29", invariant))
                    encoded (command.Price.ToString("G29", invariant))
                    encoded (command.CleanPrice.ToString("G29", invariant))
                    encoded (command.AccruedInterest.ToString("G29", invariant))
                    encoded (command.ParValue.ToString("G29", invariant))
                    encoded (dateText command.SettlementDate)
                    encoded optionTradeDate
                    encoded (command.FeeAmount.ToString("G29", invariant))
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let sipPlanRecordFromReader (reader: DbDataReader) : SipPlanRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            AssetClass = reader.GetString(3)
            Amount = reader.GetDecimal(4)
            Frequency =
                match SipPolicy.parseFrequency (reader.GetString(5)) with
                | Some frequency -> frequency
                | None -> failwith "sip plan frequency is invalid"
            Status = reader.GetString(6)
            IsSynthetic = reader.GetBoolean(7)
            AnchorDate = reader.GetFieldValue<DateOnly>(8)
            NextTradeDate = reader.GetFieldValue<DateOnly>(9)
            CreatedAt = reader.GetFieldValue<DateTimeOffset>(10)
            LastExecutionStatus = readStringOption reader 11
            LastExecutionDate =
                if reader.IsDBNull(12) then None else Some(reader.GetFieldValue<DateOnly>(12))
        }

    let findSipPlan connection transaction planId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT p.id, p.fund_id, p.instrument_code, p.asset_class, p.amount, p.frequency, p.status, p.is_synthetic,
                       p.anchor_date, p.next_trade_date, p.created_at,
                       e.status, e.trade_date
                FROM sip_plans p
                LEFT JOIN LATERAL (
                    SELECT status, trade_date FROM sip_executions
                    WHERE plan_id = p.id ORDER BY executed_at DESC, trade_date DESC LIMIT 1
                ) e ON true
                WHERE p.id = @plan_id
                """

        addParameter command "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then Some(sipPlanRecordFromReader reader) else None

    let findSipPlanIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id, plan_id FROM sip_plan_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let insertSipPlan connection transaction (plan: SipPlanRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO sip_plans (id, fund_id, instrument_code, asset_class, amount, frequency, status, is_synthetic, anchor_date, next_trade_date)
                VALUES (@id, @fund_id, @instrument_code, @asset_class, @amount, @frequency, @status, @is_synthetic, @anchor_date, @next_trade_date)
                RETURNING created_at
                """

        addParameter command "id" NpgsqlDbType.Uuid (box plan.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box plan.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box plan.InstrumentCode) |> ignore
        addParameter command "asset_class" NpgsqlDbType.Text (box plan.AssetClass) |> ignore
        addParameter command "amount" NpgsqlDbType.Numeric (box plan.Amount) |> ignore
        addParameter command "frequency" NpgsqlDbType.Text (box (SipPolicy.frequencyText plan.Frequency)) |> ignore
        addParameter command "status" NpgsqlDbType.Text (box plan.Status) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box plan.IsSynthetic) |> ignore
        addParameter command "anchor_date" NpgsqlDbType.Date (box plan.AnchorDate) |> ignore
        addParameter command "next_trade_date" NpgsqlDbType.Date (box plan.NextTradeDate) |> ignore

        use reader = command.ExecuteReader()
        reader.Read() |> ignore
        reader.GetFieldValue<DateTimeOffset>(0)

    let insertSipPlanIdempotency connection transaction key requestHash planId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO sip_plan_idempotencies (idempotency_key, request_hash, plan_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @plan_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let sipPlanRequestHash (fundId: Guid) (assetClass: string) (command: SipPlanCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let code = if isNull command.InstrumentCode then "" else command.InstrumentCode

        let payload =
            String.concat
                "|"
                [
                    "sip-plan"
                    encoded (fundId.ToString("D"))
                    encoded assetClass
                    encoded code
                    (encoded (command.Amount.ToString("G29", invariant)))
                    (encoded (SipPolicy.frequencyText command.Frequency))
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let investmentPlanRecordFromReader (reader: DbDataReader) : InvestmentPlanRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            Amount = reader.GetDecimal(3)
            Frequency =
                match InvestmentPlanPolicy.parseFrequency (reader.GetString(4)) with
                | Some frequency -> frequency
                | None -> failwith "investment plan frequency is invalid"
            Status = reader.GetString(5)
            IsSynthetic = reader.GetBoolean(6)
            AnchorDate = reader.GetFieldValue<DateOnly>(7)
            NextRunDate = reader.GetFieldValue<DateOnly>(8)
            CreatedAt = reader.GetFieldValue<DateTimeOffset>(9)
            LastRunStatus = readStringOption reader 10
            LastRunDate = if reader.IsDBNull(11) then None else Some(reader.GetFieldValue<DateOnly>(11))
        }

    let findInvestmentPlan connection transaction planId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT p.id, p.fund_id, p.instrument_code, p.amount, p.frequency, p.status, p.is_synthetic,
                       p.anchor_date, p.next_run_date, p.created_at,
                       r.status, r.run_date
                FROM investment_plans p
                LEFT JOIN LATERAL (
                    SELECT status, run_date FROM investment_plan_runs
                    WHERE plan_id = p.id ORDER BY executed_at DESC, run_date DESC LIMIT 1
                ) r ON true
                WHERE p.id = @plan_id
                """

        addParameter command "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then Some(investmentPlanRecordFromReader reader) else None

    let findInvestmentPlanIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id, plan_id FROM investment_plan_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let insertInvestmentPlan connection transaction (plan: InvestmentPlanRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO investment_plans (id, fund_id, instrument_code, amount, frequency, status, is_synthetic, anchor_date, next_run_date)
                VALUES (@id, @fund_id, @instrument_code, @amount, @frequency, @status, @is_synthetic, @anchor_date, @next_run_date)
                RETURNING created_at
                """

        addParameter command "id" NpgsqlDbType.Uuid (box plan.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box plan.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box plan.InstrumentCode) |> ignore
        addParameter command "amount" NpgsqlDbType.Numeric (box plan.Amount) |> ignore
        addParameter command "frequency" NpgsqlDbType.Text (box (InvestmentPlanPolicy.frequencyText plan.Frequency)) |> ignore
        addParameter command "status" NpgsqlDbType.Text (box plan.Status) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box plan.IsSynthetic) |> ignore
        addParameter command "anchor_date" NpgsqlDbType.Date (box plan.AnchorDate) |> ignore
        addParameter command "next_run_date" NpgsqlDbType.Date (box plan.NextRunDate) |> ignore

        use reader = command.ExecuteReader()
        reader.Read() |> ignore
        reader.GetFieldValue<DateTimeOffset>(0)

    let insertInvestmentPlanIdempotency connection transaction key requestHash planId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO investment_plan_idempotencies (idempotency_key, request_hash, plan_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @plan_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let investmentPlanRequestHash (fundId: Guid) (command: InvestmentPlanCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value
        let code = if isNull command.InstrumentCode then "" else command.InstrumentCode

        let payload =
            String.concat
                "|"
                [
                    "investment-plan"
                    encoded (fundId.ToString("D"))
                    encoded code
                    (encoded (command.Amount.ToString("G29", invariant)))
                    (encoded (InvestmentPlanPolicy.frequencyText command.Frequency))
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let rebalancePlanRecordFromReader (reader: DbDataReader) : RebalancePlanRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            Targets = []
            Status = reader.GetString(2)
            IsSynthetic = reader.GetBoolean(3)
            CreatedAt = reader.GetFieldValue<DateTimeOffset>(4)
        }

    let rebalanceTargetsFromReader (reader: DbDataReader) : RebalanceTarget list =
        let targets = ResizeArray<RebalanceTarget>()

        while reader.Read() do
            targets.Add(
                {
                    InstrumentCode = reader.GetString(0)
                    TargetPercent = reader.GetDecimal(1)
                }
            )

        targets |> Seq.toList

    let rebalancePlanWithTargets connection transaction (plan: RebalancePlanRecord) =
        use targetsCommand =
            commandWithTransaction
                connection
                transaction
                "SELECT instrument_code, target_percent FROM rebalance_targets WHERE plan_id = @plan_id ORDER BY instrument_code"

        addParameter targetsCommand "plan_id" NpgsqlDbType.Uuid (box plan.Id) |> ignore

        use reader = targetsCommand.ExecuteReader()
        let targets = rebalanceTargetsFromReader reader
        { plan with Targets = targets }

    let findRebalancePlan connection transaction planId =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT id, fund_id, status, is_synthetic, created_at FROM rebalance_plans WHERE id = @plan_id"

        addParameter command "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore

        use reader = command.ExecuteReader()

        if reader.Read() then
            let plan = rebalancePlanRecordFromReader reader
            reader.Close()
            Some(rebalancePlanWithTargets connection transaction plan)
        else
            None

    let findRebalanceIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id, plan_id FROM rebalance_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let insertRebalancePlan connection transaction (plan: RebalancePlanRecord) =
        use planCommand =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO rebalance_plans (id, fund_id, status, is_synthetic)
                VALUES (@id, @fund_id, @status, @is_synthetic)
                RETURNING created_at
                """

        addParameter planCommand "id" NpgsqlDbType.Uuid (box plan.Id) |> ignore
        addParameter planCommand "fund_id" NpgsqlDbType.Uuid (box plan.FundId) |> ignore
        addParameter planCommand "status" NpgsqlDbType.Text (box plan.Status) |> ignore
        addParameter planCommand "is_synthetic" NpgsqlDbType.Boolean (box plan.IsSynthetic) |> ignore

        use reader = planCommand.ExecuteReader()
        reader.Read() |> ignore
        let createdAt = reader.GetFieldValue<DateTimeOffset>(0)
        reader.Close()

        for target in plan.Targets do
            use targetCommand =
                commandWithTransaction
                    connection
                    transaction
                    """
                    INSERT INTO rebalance_targets (plan_id, instrument_code, target_percent)
                    VALUES (@plan_id, @instrument_code, @target_percent)
                    """

            addParameter targetCommand "plan_id" NpgsqlDbType.Uuid (box plan.Id) |> ignore
            addParameter targetCommand "instrument_code" NpgsqlDbType.Text (box target.InstrumentCode) |> ignore
            addParameter targetCommand "target_percent" NpgsqlDbType.Numeric (box target.TargetPercent) |> ignore
            targetCommand.ExecuteNonQuery() |> ignore

        createdAt

    let insertRebalanceIdempotency connection transaction key requestHash planId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO rebalance_idempotencies (idempotency_key, request_hash, plan_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @plan_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let rebalanceRequestHash (fundId: Guid) (command: RebalancePlanCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value

        let payload =
            String.concat
                "|"
                ([ "rebalance-plan"; encoded (fundId.ToString("D")) ]
                 @ (command.Targets
                    |> List.sortBy (fun target -> target.InstrumentCode)
                    |> List.collect (fun target ->
                        [
                            encoded target.InstrumentCode
                            encoded (target.TargetPercent.ToString("G29", invariant))
                        ])))

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let validateRebalanceCommand (command: RebalancePlanCommand) =
        match RebalancePolicy.validateTargets command.Targets with
        | Error message -> Error message
        | Ok() -> Ok()

    let rebalanceExecutionRecordFromReader (reader: DbDataReader) : RebalanceExecutionRecord =
        {
            PlanId = reader.GetGuid(0)
            RunDate = reader.GetFieldValue<DateOnly>(1)
            InstrumentCode = reader.GetString(2)
            Action = reader.GetString(3)
            Amount = reader.GetDecimal(4)
            Status = reader.GetString(5)
            OrderId = if reader.IsDBNull(6) then None else Some(reader.GetGuid(6))
            PendingReason = readStringOption reader 7
            ExecutedAt = reader.GetFieldValue<DateTimeOffset>(8)
        }

    let upsertRebalanceExecution
        connection
        transaction
        (planId: Guid)
        (runDate: DateOnly)
        (outcome: RebalanceOrderOutcome)
        =
        let amount =
            match Decimal.TryParse(outcome.Amount, NumberStyles.Float, CultureInfo.InvariantCulture) with
            | true, value -> value
            | false, _ -> 0m

        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO rebalance_executions (plan_id, run_date, instrument_code, action, amount, status, order_id, pending_reason)
                VALUES (@plan_id, @run_date, @instrument_code, @action, @amount, @status, @order_id, @pending_reason)
                ON CONFLICT (plan_id, run_date, instrument_code) DO UPDATE
                SET action = EXCLUDED.action,
                    amount = EXCLUDED.amount,
                    status = EXCLUDED.status,
                    order_id = EXCLUDED.order_id,
                    pending_reason = EXCLUDED.pending_reason,
                    executed_at = now()
                """

        addParameter command "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
        addParameter command "run_date" NpgsqlDbType.Date (box runDate) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box outcome.InstrumentCode) |> ignore
        addParameter command "action" NpgsqlDbType.Text (box outcome.Action) |> ignore
        addParameter command "amount" NpgsqlDbType.Numeric (box amount) |> ignore
        addParameter command "status" NpgsqlDbType.Text (box outcome.Status) |> ignore

        let orderParameter =
            match outcome.OrderId with
            | Some value -> box value
            | None -> box DBNull.Value

        addParameter command "order_id" NpgsqlDbType.Uuid orderParameter |> ignore

        let reasonParameter =
            match outcome.PendingReason with
            | Some value -> box value
            | None -> box DBNull.Value

        addParameter command "pending_reason" NpgsqlDbType.Text reasonParameter |> ignore
        command.ExecuteNonQuery() |> ignore

    let dividendRecordFromReader (reader: DbDataReader) : DividendRecord =
        {
            Id = reader.GetGuid(0)
            FundId = reader.GetGuid(1)
            InstrumentCode = reader.GetString(2)
            NavDate = reader.GetFieldValue<DateOnly>(3)
            Dps = reader.GetDecimal(4)
            Mode =
                match DividendPolicy.parseMode (reader.GetString(5)) with
                | Some mode -> mode
                | None -> failwith "dividend mode is invalid"
            Status = reader.GetString(6)
            IsSynthetic = reader.GetBoolean(7)
            GrossCash = readDecimalOption reader 8
            CreditedUnits = readDecimalOption reader 9
            CreditedInvested = readDecimalOption reader 10
            OrderId = if reader.IsDBNull(11) then None else Some(reader.GetGuid(11))
            PendingReason = readStringOption reader 12
            CreatedAt = reader.GetFieldValue<DateTimeOffset>(13)
        }

    let findDividendRecord connection transaction recordId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                SELECT id, fund_id, instrument_code, nav_date, dps, mode, status, is_synthetic,
                       gross_cash, credited_units, credited_invested, order_id, pending_reason, created_at
                FROM dividend_records WHERE id = @record_id
                """

        addParameter command "record_id" NpgsqlDbType.Uuid (box recordId) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then Some(dividendRecordFromReader reader) else None

    let findDividendIdempotency connection transaction key =
        use command =
            commandWithTransaction
                connection
                transaction
                "SELECT request_hash, fund_id, record_id FROM dividend_idempotencies WHERE idempotency_key = @idempotency_key"

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore

        use reader = command.ExecuteReader()
        if reader.Read() then
            Some(reader.GetString(0), reader.GetGuid(1), reader.GetGuid(2))
        else
            None

    let insertDividendRecord connection transaction (record: DividendRecord) =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO dividend_records
                    (id, fund_id, instrument_code, nav_date, dps, mode, status, is_synthetic, gross_cash)
                VALUES (@id, @fund_id, @instrument_code, @nav_date, @dps, @mode, @status, @is_synthetic, @gross_cash)
                RETURNING created_at
                """

        addParameter command "id" NpgsqlDbType.Uuid (box record.Id) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box record.FundId) |> ignore
        addParameter command "instrument_code" NpgsqlDbType.Text (box record.InstrumentCode) |> ignore
        addParameter command "nav_date" NpgsqlDbType.Date (box record.NavDate) |> ignore
        addParameter command "dps" NpgsqlDbType.Numeric (box record.Dps) |> ignore
        addParameter command "mode" NpgsqlDbType.Text (box (DividendPolicy.modeText record.Mode)) |> ignore
        addParameter command "status" NpgsqlDbType.Text (box record.Status) |> ignore
        addParameter command "is_synthetic" NpgsqlDbType.Boolean (box record.IsSynthetic) |> ignore

        let grossParameter =
            match record.GrossCash with
            | Some gross -> box gross
            | None -> box DBNull.Value

        addParameter command "gross_cash" NpgsqlDbType.Numeric grossParameter |> ignore

        use reader = command.ExecuteReader()
        reader.Read() |> ignore
        reader.GetFieldValue<DateTimeOffset>(0)

    let insertDividendIdempotency connection transaction key requestHash recordId fundId =
        use command =
            commandWithTransaction
                connection
                transaction
                """
                INSERT INTO dividend_idempotencies (idempotency_key, request_hash, record_id, fund_id)
                VALUES (@idempotency_key, @request_hash, @record_id, @fund_id)
                """

        addParameter command "idempotency_key" NpgsqlDbType.Text (box key) |> ignore
        addParameter command "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
        addParameter command "record_id" NpgsqlDbType.Uuid (box recordId) |> ignore
        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let finishDividendRecord connection transaction (recordId: Guid) (status: string) (pendingReason: string option) =
        use command =
            commandWithTransaction
                connection
                transaction
                "UPDATE dividend_records SET status = @status, pending_reason = @reason WHERE id = @record_id"

        addParameter command "status" NpgsqlDbType.Text (box status) |> ignore

        let reasonParameter =
            match pendingReason with
            | Some reason -> box reason
            | None -> box DBNull.Value

        addParameter command "reason" NpgsqlDbType.Text reasonParameter |> ignore
        addParameter command "record_id" NpgsqlDbType.Uuid (box recordId) |> ignore
        command.ExecuteNonQuery() |> ignore

    let dividendRequestHash (fundId: Guid) (command: DividendCommand) =
        let invariant = CultureInfo.InvariantCulture
        let encoded (value: string) = sprintf "%d:%s" value.Length value

        let payload =
            String.concat
                "|"
                [
                    "dividend"
                    encoded (fundId.ToString("D"))
                    encoded command.InstrumentCode
                    encoded (command.NavDate.ToString("yyyy-MM-dd"))
                    (encoded (command.Dps.ToString("G29", invariant)))
                    (encoded (DividendPolicy.modeText command.Mode))
                ]

        Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(payload)))

    let dividendSchemeKey (fundId: Guid) (command: DividendCommand) =
        DividendPolicy.schemeKey fundId command.InstrumentCode command.NavDate command.Mode

    let validateDividendCommand (today: DateOnly) (command: DividendCommand) =
        if String.IsNullOrWhiteSpace command.InstrumentCode then
            Error "instrument code cannot be empty"
        elif command.Dps <= 0m then
            Error "dividend per unit must be positive"
        else
            match DividendPolicy.validateDps command.Dps, DividendPolicy.validateNavDate command.NavDate today with
            | Ok(), Ok() -> Ok()
            | Error message, _
            | _, Error message -> Error message
    member _.EnsureSchema() =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()
        use command = connection.CreateCommand()
        command.CommandText <- schema
        command.ExecuteNonQuery() |> ignore

    member _.GetFund(fundId: Guid) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()
        findFund connection None fundId

    member _.UpsertInstruments(payload: MarketDataSearchPayload, payloadHash: string) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()
        use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

        try
            for instrument in payload.Instruments do
                upsertInstrument connection (Some transaction) payload payloadHash instrument

            transaction.Commit()
        with error ->
            try
                transaction.Rollback()
            with _ ->
                ()

            raise error

    member _.GetInstrument(code: string) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT code, name, fund_type, source, source_revision,
                       source_collected_at, source_payload_hash,
                       first_seen_at, last_seen_at
                FROM instruments
                WHERE code = @code
                """

        addParameter command "code" NpgsqlDbType.Text (box code) |> ignore
        use reader = command.ExecuteReader()
        if reader.Read() then Some(instrumentRecordFromReader reader) else None

    member _.UpsertNavObservations(payload: MarketDataNavPayload, payloadHash: string) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()
        use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

        try
            for observation in payload.Observations do
                upsertNavObservation connection (Some transaction) payload payloadHash observation

            transaction.Commit()
        with error ->
            try
                transaction.Rollback()
            with _ ->
                ()

            raise error

    member _.GetNav(code: string, fromDate: DateOnly option, toDate: DateOnly option) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        let conditions = ResizeArray<string>()
        conditions.Add("instrument_code = @instrument_code")

        if fromDate.IsSome then
            conditions.Add("nav_date >= @from_date")

        if toDate.IsSome then
            conditions.Add("nav_date <= @to_date")

        use command =
            commandWithTransaction
                connection
                None
                (sprintf
                    """
                    SELECT instrument_code, nav_date, published_at, nav, accumulated_nav,
                           daily_return, source, source_revision, source_collected_at,
                           source_payload_hash, first_seen_at, last_seen_at
                    FROM fund_nav_observations
                    WHERE %s
                    ORDER BY nav_date ASC
                    """
                    (String.concat " AND " conditions))

        addParameter command "instrument_code" NpgsqlDbType.Text (box code) |> ignore

        match fromDate with
        | Some value -> addParameter command "from_date" NpgsqlDbType.Date (box value) |> ignore
        | None -> ()

        match toDate with
        | Some value -> addParameter command "to_date" NpgsqlDbType.Date (box value) |> ignore
        | None -> ()

        use reader = command.ExecuteReader()
        let records = ResizeArray<MarketDataNavRecord>()

        while reader.Read() do
            records.Add(navRecordFromReader reader)

        records |> Seq.toList

    member _.UpsertInstrumentSnapshots(records: InstrumentSnapshotRecord list) =
        if records.IsEmpty then
            ()
        else
            use connection = new NpgsqlConnection(connectionString)
            connection.Open()
            use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

            try
                for record in records do
                    use command =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            """
                            INSERT INTO instrument_snapshots
                                (instrument_code, asset_class, snapshot_date, price, source,
                                 source_revision, source_collected_at, source_payload_hash)
                            VALUES
                                (@instrument_code, @asset_class, @snapshot_date, @price, @source,
                                 @source_revision, @source_collected_at, @source_payload_hash)
                            ON CONFLICT (instrument_code, asset_class, snapshot_date) DO UPDATE SET
                                price = EXCLUDED.price,
                                source = EXCLUDED.source,
                                source_revision = EXCLUDED.source_revision,
                                source_collected_at = EXCLUDED.source_collected_at,
                                source_payload_hash = EXCLUDED.source_payload_hash,
                                last_seen_at = now(),
                                first_seen_at = CASE
                                    WHEN instrument_snapshots.source_payload_hash = EXCLUDED.source_payload_hash
                                    THEN instrument_snapshots.first_seen_at
                                    ELSE now()
                                END
                            """

                    addParameter command "instrument_code" NpgsqlDbType.Text (box record.InstrumentCode) |> ignore
                    addParameter command "asset_class" NpgsqlDbType.Text (box record.AssetClass) |> ignore
                    addParameter command "snapshot_date" NpgsqlDbType.Date (box record.SnapshotDate) |> ignore
                    addParameter command "price" NpgsqlDbType.Numeric (box record.Price) |> ignore
                    addParameter command "source" NpgsqlDbType.Text (box record.Source) |> ignore
                    addParameter command "source_revision" NpgsqlDbType.Text (box record.SourceRevision) |> ignore
                    addParameter command "source_collected_at" NpgsqlDbType.TimestampTz (box record.SourceCollectedAt) |> ignore
                    addParameter command "source_payload_hash" NpgsqlDbType.Text (box record.SourcePayloadHash) |> ignore
                    command.ExecuteNonQuery() |> ignore

                transaction.Commit()
            with error ->
                try
                    transaction.Rollback()
                with _ ->
                    ()

                raise error

    /// Latest snapshot price on or before `asOfDate` for every instrument of the
    /// given asset class held by the fund. Instruments without any snapshot are
    /// omitted so a caller can tell "no snapshot yet" from a stored price.
    member _.GetLatestSnapshots(fundId: Guid, assetClass: string, asOfDate: DateOnly) : Map<string, InstrumentSnapshotRecord> =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()
        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT s.instrument_code, s.asset_class, s.snapshot_date, s.price, s.source,
                       s.source_revision, s.source_collected_at, s.source_payload_hash
                FROM instrument_snapshots s
                JOIN (
                    SELECT instrument_code, MAX(snapshot_date) AS snapshot_date
                    FROM instrument_snapshots
                    WHERE asset_class = @asset_class AND snapshot_date <= @as_of_date
                    GROUP BY instrument_code
                ) latest
                  ON latest.instrument_code = s.instrument_code
                 AND latest.snapshot_date = s.snapshot_date
                WHERE s.asset_class = @asset_class
                """

        addParameter command "asset_class" NpgsqlDbType.Text (box assetClass) |> ignore
        addParameter command "as_of_date" NpgsqlDbType.Date (box asOfDate) |> ignore
        use reader = command.ExecuteReader()
        let records = System.Collections.Generic.Dictionary<string, InstrumentSnapshotRecord>()

        while reader.Read() do
            let record : InstrumentSnapshotRecord =
                { InstrumentCode = reader.GetString(0)
                  AssetClass = reader.GetString(1)
                  SnapshotDate = reader.GetFieldValue<DateOnly>(2)
                  Price = reader.GetDecimal(3)
                  Source = reader.GetString(4)
                  SourceRevision = reader.GetString(5)
                  SourceCollectedAt = reader.GetFieldValue<DateTimeOffset>(6)
                  SourcePayloadHash = reader.GetString(7) }

            records.[record.InstrumentCode] <- record

        records
        |> Seq.map (fun pair -> pair.Key, pair.Value)
        |> Map.ofSeq

    member _.CreateFund(idempotencyKey: string, command: FundCreateCommand) =
        if String.IsNullOrWhiteSpace idempotencyKey then
            FundWriteResult.Invalid "idempotency key cannot be empty"
        else
            match validateStorageRange command with
            | Error message -> FundWriteResult.Invalid message
            | Ok() ->
                let fingerprint = requestHash command
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()
                use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                try
                    use lockCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                    addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                    lockCommand.ExecuteNonQuery() |> ignore

                    match findIdempotency connection (Some transaction) idempotencyKey with
                    | Some(existingHash, fundId) when existingHash = fingerprint ->
                        match findFund connection (Some transaction) fundId with
                        | Some fund ->
                            transaction.Commit()
                            FundWriteResult.Replayed fund
                        | None ->
                            transaction.Rollback()
                            FundWriteResult.Invalid "idempotency record references a missing fund"
                    | Some _ ->
                        transaction.Rollback()
                        FundWriteResult.IdempotencyConflict
                    | None ->
                        let fundId = Guid.NewGuid()

                        match Ledger.initializeFund fundId command.Name command.InitialCash command.InitialUnitNav command.IsSynthetic Ledger.empty with
                        | Error error ->
                            transaction.Rollback()
                            FundWriteResult.Invalid(ledgerErrorMessage error)
                        | Ok state ->
                            match Ledger.getFund fundId state with
                            | Error error ->
                                transaction.Rollback()
                                FundWriteResult.Invalid(ledgerErrorMessage error)
                            | Ok fund ->
                                insertFund connection (Some transaction) fund
                                insertIdempotency connection (Some transaction) idempotencyKey fingerprint fundId
                                transaction.Commit()
                                FundWriteResult.Created(recordFromLedger fund)
                with error ->
                    try
                        transaction.Rollback()
                    with _ ->
                        ()

                    raise error

    member _.CreateSubscriptionOrder(idempotencyKey: string, fundId: Guid, command: SubscriptionOrderCommand, ?tradeDateOverride: DateOnly) : SubscriptionOrderWriteResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            OrderInvalid "idempotency key cannot be empty"
        else
            match validateOrderCommand command with
            | Error message -> OrderInvalid message
            | Ok() ->
                let fingerprint = orderRequestHash fundId command
                let reservedTotal = command.Amount + command.FeeAmount
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()
                use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                try
                    use lockCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                    addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                    lockCommand.ExecuteNonQuery() |> ignore

                    match findOrderIdempotency connection (Some transaction) idempotencyKey with
                    | Some(existingHash, existingFundId, orderId)
                        when existingHash = fingerprint && existingFundId = fundId ->
                        match findOrder connection (Some transaction) orderId with
                        | Some order ->
                            transaction.Commit()
                            OrderReplayed order
                        | None ->
                            transaction.Rollback()
                            OrderInvalid "idempotency record references a missing order"
                    | Some _ ->
                        transaction.Rollback()
                        OrderIdempotencyConflict
                    | None ->
                        match lockFundForOrder connection (Some transaction) fundId with
                        | None ->
                            transaction.Rollback()
                            OrderFundNotFound
                        | Some isSynthetic ->
                            if instrumentExists connection (Some transaction) command.FundCode then
                                use cashCommand =
                                    commandWithTransaction
                                        connection
                                        (Some transaction)
                                        """
                                        UPDATE funds
                                        SET available_cash = available_cash - @reserved_total,
                                            reserved_cash = reserved_cash + @reserved_total
                                        WHERE id = @fund_id AND available_cash >= @reserved_total
                                        """

                                addParameter cashCommand "reserved_total" NpgsqlDbType.Numeric (box reservedTotal) |> ignore
                                addParameter cashCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

                                if cashCommand.ExecuteNonQuery() = 0 then
                                    transaction.Rollback()
                                    OrderInsufficientFunds
                                else
                                    let submittedAt = DateTimeOffset.UtcNow
                                    let tradeDate =
                                        tradeDateOverride
                                        |> Option.defaultWith (fun () -> ConfirmationPolicy.tradeDateFor submittedAt)

                                    let order: SubscriptionOrderRecord =
                                        {
                                            Id = Guid.NewGuid()
                                            FundId = fundId
                                            FundCode = command.FundCode
                                            Amount = command.Amount
                                            FeeAmount = command.FeeAmount
                                            ReservedTotal = reservedTotal
                                            Status = orderStatusText
                                            SubmittedAt = submittedAt
                                            IsSynthetic = isSynthetic
                                            TradeDate = tradeDate
                                            ConfirmIdempotencyKey = None
                                            PendingReason = None
                                            ConfirmedAt = None
                                            ConfirmedQuote = None
                                            ConfirmedUnits = None
                                            ConfirmedInvestedCash = None
                                            ConfirmedResidualCash = None
                                        }

                                    let submittedAt = insertSubscriptionOrder connection (Some transaction) order
                                    insertOrderIdempotency connection (Some transaction) idempotencyKey fingerprint order.Id fundId
                                    transaction.Commit()
                                    OrderCreated { order with SubmittedAt = submittedAt }
                            else
                                transaction.Rollback()
                                OrderInstrumentNotFound
                with error ->
                    try
                        transaction.Rollback()
                    with _ ->
                        ()

                    raise error

    member _.GetSubscriptionOrders(fundId: Guid) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT id, fund_id, fund_code, amount, fee_amount,
                       reserved_total, status, is_synthetic, submitted_at,
                       trade_date,
                       confirm_idempotency_key, pending_reason, confirmed_at,
                       confirmed_nav, confirmed_nav_date, confirmed_nav_source,
                       confirmed_nav_revision, confirmed_nav_collected_at, confirmed_nav_published_at,
                       confirmed_nav_payload_hash, confirmed_nav_first_seen_at,
                       confirmed_units, confirmed_invested_cash, confirmed_residual_cash
                FROM subscription_orders
                WHERE fund_id = @fund_id
                ORDER BY submitted_at DESC, id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<SubscriptionOrderRecord>()

        while reader.Read() do
            records.Add(orderRecordFromReader reader)

        records |> Seq.toList

    member _.CreateSipPlan(idempotencyKey: string, fundId: Guid, command: SipPlanCommand, ?anchorOverride: DateOnly, ?assetClass: string) : SipPlanWriteResult =
        let resolvedAssetClass =
            match assetClass with
            | Some value when not (String.IsNullOrWhiteSpace value) -> value.Trim().ToLowerInvariant()
            | _ -> "fund"

        if resolvedAssetClass <> "fund" && resolvedAssetClass <> "stock" then
            SipPlanWriteResult.SipPlanInvalid "assetClass must be fund or stock"
        elif String.IsNullOrWhiteSpace idempotencyKey then
            SipPlanWriteResult.SipPlanInvalid "idempotency key cannot be empty"
        else
            match SipPolicy.validateAmount command.Amount with
            | Error message -> SipPlanWriteResult.SipPlanInvalid message
            | Ok() ->
                let fingerprint = sipPlanRequestHash fundId resolvedAssetClass command
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()
                use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                try
                    use lockCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                    addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                    lockCommand.ExecuteNonQuery() |> ignore

                    match findSipPlanIdempotency connection (Some transaction) idempotencyKey with
                    | Some(existingHash, existingFundId, planId)
                        when existingHash = fingerprint && existingFundId = fundId ->
                        match findSipPlan connection (Some transaction) planId with
                        | Some plan ->
                            transaction.Commit()
                            SipPlanWriteResult.SipPlanReplayed plan
                        | None ->
                            transaction.Rollback()
                            SipPlanWriteResult.SipPlanInvalid "idempotency record references a missing plan"
                    | Some _ ->
                        transaction.Rollback()
                        SipPlanWriteResult.SipPlanIdempotencyConflict
                    | None ->
                        match lockFundForOrder connection (Some transaction) fundId with
                        | None ->
                            transaction.Rollback()
                            SipPlanWriteResult.SipPlanFundNotFound
                        | Some isSynthetic ->
                            if resolvedAssetClass = "stock" || instrumentExists connection (Some transaction) command.InstrumentCode then
                                let anchorDate =
                                    anchorOverride
                                    |> Option.defaultWith (fun () -> ConfirmationPolicy.tradeDateFor DateTimeOffset.UtcNow)

                                let plan: SipPlanRecord =
                                    {
                                        Id = Guid.NewGuid()
                                        FundId = fundId
                                        InstrumentCode = command.InstrumentCode
                                        AssetClass = resolvedAssetClass
                                        Amount = command.Amount
                                        Frequency = command.Frequency
                                        Status = "active"
                                        IsSynthetic = isSynthetic
                                        AnchorDate = anchorDate
                                        NextTradeDate = SipPolicy.nextTradeDate command.Frequency anchorDate (anchorDate.AddDays 1)
                                        CreatedAt = DateTimeOffset.UtcNow
                                        LastExecutionStatus = None
                                        LastExecutionDate = None
                                    }

                                let createdAt = insertSipPlan connection (Some transaction) plan
                                insertSipPlanIdempotency connection (Some transaction) idempotencyKey fingerprint plan.Id fundId
                                transaction.Commit()
                                SipPlanWriteResult.SipPlanCreated { plan with CreatedAt = createdAt }
                            else
                                transaction.Rollback()
                                SipPlanWriteResult.SipPlanInstrumentNotFound
                with error ->
                    try
                        transaction.Rollback()
                    with _ ->
                        ()

                    raise error

    member this.AdvanceSipPlans(fundId: Guid, endDate: DateOnly, limit: int, ?stockQuote: string -> Result<StockSipQuote, string>) : SipAdvanceResult =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

        try
            use lockCommand =
                commandWithTransaction
                    connection
                    (Some transaction)
                    "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

            addParameter lockCommand "lock_key" NpgsqlDbType.Text (box (sprintf "sip-advance:%O" fundId)) |> ignore
            lockCommand.ExecuteNonQuery() |> ignore

            // 0. retry phase: confirmations that were pending_nav get re-run once their NAV landed
            use retryCommand =
                commandWithTransaction
                    connection
                    (Some transaction)
                    """
                    SELECT e.plan_id, e.trade_date, e.order_id
                    FROM sip_executions e
                    JOIN sip_plans p ON p.id = e.plan_id
                    WHERE p.fund_id = @fund_id AND e.status = 'pending_nav'
                    ORDER BY e.trade_date
                    """

            addParameter retryCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

            use retryReader = retryCommand.ExecuteReader()
            let pendingRetries = ResizeArray<Guid * DateOnly * Guid>()

            while retryReader.Read() do
                pendingRetries.Add(
                    retryReader.GetGuid(0),
                    retryReader.GetFieldValue<DateOnly>(1),
                    retryReader.GetGuid(2)
                )

            retryReader.Close()

            for (retryPlanId, retryDate, retryOrderId) in pendingRetries do
                let confirmKey = sprintf "sip-confirm:%O:%s" retryPlanId (retryDate.ToString("yyyy-MM-dd"))

                match this.ConfirmSubscriptionOrder(confirmKey, fundId, retryOrderId) with
                | SubscriptionConfirmResult.OrderConfirmed _
                | SubscriptionConfirmResult.ConfirmReplayed _ ->
                    use doneCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "UPDATE sip_executions SET status = 'succeeded', pending_reason = NULL, executed_at = now() WHERE plan_id = @plan_id AND trade_date = @trade_date"

                    addParameter doneCommand "plan_id" NpgsqlDbType.Uuid (box retryPlanId) |> ignore
                    addParameter doneCommand "trade_date" NpgsqlDbType.Date (box retryDate) |> ignore
                    doneCommand.ExecuteNonQuery() |> ignore
                | _ ->
                    // still pending: keep the execution as pending_nav for the next drive
                    ()

            use plansCommand =
                commandWithTransaction
                    connection
                    (Some transaction)
                    "SELECT id, instrument_code, asset_class, amount, frequency, anchor_date, next_trade_date FROM sip_plans WHERE fund_id = @fund_id AND status = 'active' ORDER BY created_at"

            addParameter plansCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

            use plansReader = plansCommand.ExecuteReader()
            let plans = ResizeArray<Guid * string * string * decimal * SipFrequency * DateOnly * DateOnly>()

            while plansReader.Read() do
                plans.Add(
                    plansReader.GetGuid(0),
                    plansReader.GetString(1),
                    plansReader.GetString(2),
                    plansReader.GetDecimal(3),
                    (match SipPolicy.parseFrequency (plansReader.GetString(4)) with
                     | Some frequency -> frequency
                     | None -> failwith "sip plan frequency is invalid"),
                    plansReader.GetFieldValue<DateOnly>(5),
                    plansReader.GetFieldValue<DateOnly>(6)
                )

            plansReader.Close()

            let readExecutionsUpTo (planId: Guid) (upTo: DateOnly) =
                use replayCommand =
                    commandWithTransaction
                        connection
                        (Some transaction)
                        """
                        SELECT trade_date, status, order_id, pending_reason
                        FROM sip_executions
                        WHERE plan_id = @plan_id AND trade_date <= @up_to
                        ORDER BY trade_date
                        """

                addParameter replayCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                addParameter replayCommand "up_to" NpgsqlDbType.Date (box upTo) |> ignore

                use reader = replayCommand.ExecuteReader()
                let rows = ResizeArray<SipExecutionOutcome>()

                while reader.Read() do
                    rows.Add(
                        {
                            TradeDate = reader.GetFieldValue<DateOnly>(0)
                            Status = reader.GetString(1)
                            OrderId = (if reader.IsDBNull(2) then None else Some(reader.GetGuid(2)))
                            PendingReason = readStringOption reader 3
                        }
                    )

                rows |> Seq.toList

            let rollPlanPointer (planId: Guid) (nextDate: DateOnly) (frequency: SipFrequency) (anchor: DateOnly) (dueDates: DateOnly list) =
                let rolled =
                    match dueDates with
                    | [] -> nextDate
                    | _ -> SipPolicy.nextTradeDate frequency anchor ((List.last dueDates).AddDays 1)

                if not (List.isEmpty dueDates) then
                    use rollCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "UPDATE sip_plans SET next_trade_date = @next_date WHERE id = @plan_id"

                    addParameter rollCommand "next_date" NpgsqlDbType.Date (box rolled) |> ignore
                    addParameter rollCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    rollCommand.ExecuteNonQuery() |> ignore

                rolled

            // Stock SIP: schedule, lot sizing and idempotency mirror the fund path, but each
            // due period buys the target stock through the shared stock-trade pipeline using a
            // live quote (suspension and missing prices stop the period).
            let advanceStockPlanRow (planId: Guid, code: string, assetClass: string, amount: decimal, frequency: SipFrequency, anchor: DateOnly, nextDate: DateOnly) =
                let dueDates =
                    SipPolicy.advancePlan frequency anchor nextDate endDate
                    |> List.truncate (max 1 limit)

                let outcomes = ResizeArray<SipExecutionOutcome>()

                let upsertExecution (tradeDate: DateOnly) =
                    use insertCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            """
                            INSERT INTO sip_executions (plan_id, trade_date, amount, fee_amount, status)
                            VALUES (@plan_id, @trade_date, @amount, @fee_amount, 'processing')
                            ON CONFLICT (plan_id, trade_date) DO NOTHING
                            RETURNING trade_date
                            """

                    addParameter insertCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    addParameter insertCommand "trade_date" NpgsqlDbType.Date (box tradeDate) |> ignore
                    addParameter insertCommand "amount" NpgsqlDbType.Numeric (box amount) |> ignore
                    addParameter insertCommand "fee_amount" NpgsqlDbType.Numeric (box 0m) |> ignore

                    use reader = insertCommand.ExecuteReader()
                    let inserted = reader.Read()
                    reader.Close()
                    inserted

                let setExecution (tradeDate: DateOnly) (status: string) (orderId: Guid option) (reason: string option) =
                    use updateCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            """
                            UPDATE sip_executions
                            SET status = @status,
                                order_id = @order_id,
                                pending_reason = @reason,
                                executed_at = now()
                            WHERE plan_id = @plan_id AND trade_date = @trade_date
                            """

                    addParameter updateCommand "status" NpgsqlDbType.Text (box status) |> ignore

                    let orderParameter =
                        match orderId with
                        | Some value -> box value
                        | None -> box DBNull.Value

                    addParameter updateCommand "order_id" NpgsqlDbType.Uuid orderParameter |> ignore

                    let reasonParameter =
                        match reason with
                        | Some value -> box value
                        | None -> box DBNull.Value

                    addParameter updateCommand "reason" NpgsqlDbType.Text reasonParameter |> ignore
                    addParameter updateCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    addParameter updateCommand "trade_date" NpgsqlDbType.Date (box tradeDate) |> ignore
                    updateCommand.ExecuteNonQuery() |> ignore

                let findExistingExecution (tradeDate: DateOnly) =
                    use selectCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT status, order_id, pending_reason FROM sip_executions WHERE plan_id = @plan_id AND trade_date = @trade_date"

                    addParameter selectCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    addParameter selectCommand "trade_date" NpgsqlDbType.Date (box tradeDate) |> ignore

                    use reader = selectCommand.ExecuteReader()

                    if reader.Read() then
                        Some
                            (reader.GetString(0),
                             (if reader.IsDBNull(1) then None else Some(reader.GetGuid(1))),
                             readStringOption reader 2)
                    else
                        None

                let settle (tradeDate: DateOnly) (status: string) (orderId: Guid option) (reason: string option) =
                    setExecution tradeDate status orderId reason

                    outcomes.Add(
                        {
                            TradeDate = tradeDate
                            Status = status
                            OrderId = orderId
                            PendingReason = reason
                        }
                    )

                for tradeDate in dueDates do
                    if upsertExecution tradeDate then
                        let quoteResult =
                            match stockQuote with
                            | Some resolve -> resolve code
                            | None -> Error "stock quote probe is not configured"

                        match quoteResult with
                        | Error reason -> settle tradeDate "market_data_unavailable" None (Some reason)
                        | Ok quote ->
                            match quote.Suspended with
                            | Some true -> settle tradeDate "suspended" None (Some "stock is suspended and cannot be traded")
                            | _ ->
                                match quote.Price with
                                | Some price when price > 0m ->
                                    let lot = StockTerms.aShareDefault.MinUnit
                                    let lots = Decimal.Floor(amount / (price * lot))
                                    let quantity = lots * lot

                                    if quantity <= 0m then
                                        settle tradeDate "insufficient_cash" None (Some "scheduled amount is below one board lot at the current price")
                                    else
                                        let tradeKey = sprintf "sip:%O:%s" planId (tradeDate.ToString("yyyy-MM-dd"))
                                        let executedAt = DateTimeOffset(tradeDate.ToDateTime(TimeOnly.MinValue), TimeSpan.Zero)

                                        let command: StockTradeCommand =
                                            {
                                                InstrumentCode = code
                                                StockName = quote.Name
                                                Quantity = quantity
                                                Price = price
                                            }

                                        match this.CreateStockTrade(tradeKey, fundId, command, executedAt, true) with
                                        | StockTradeWriteResult.StockTradeCreated trade
                                        | StockTradeWriteResult.StockTradeReplayed trade ->
                                            settle tradeDate "succeeded" (Some trade.Id) None
                                        | StockTradeWriteResult.StockTradeInsufficientFunds reason ->
                                            settle tradeDate "insufficient_cash" None (Some reason)
                                        | StockTradeWriteResult.StockTradeInvalid reason -> settle tradeDate "failed" None (Some reason)
                                        | StockTradeWriteResult.StockTradeIdempotencyConflict ->
                                            settle tradeDate "failed" None (Some "idempotency key was used with a different request")
                                        | StockTradeWriteResult.StockTradeFundNotFound ->
                                            settle tradeDate "failed" None (Some "fund was not found")
                                | _ -> settle tradeDate "market_data_unavailable" None (Some "stock quote did not include a price")
                    else
                        match findExistingExecution tradeDate with
                        | Some(status, orderId, reason) ->
                            outcomes.Add(
                                {
                                    TradeDate = tradeDate
                                    Status = status
                                    OrderId = orderId
                                    PendingReason = reason
                                }
                            )
                        | None ->
                            outcomes.Add(
                                {
                                    TradeDate = tradeDate
                                    Status = "unknown"
                                    OrderId = None
                                    PendingReason = None
                                }
                            )

                let rolled = rollPlanPointer planId nextDate frequency anchor dueDates

                let replayedOutcomes =
                    if List.isEmpty dueDates then readExecutionsUpTo planId endDate else outcomes |> Seq.toList

                {
                    PlanId = planId
                    InstrumentCode = code
                    AssetClass = assetClass
                    Amount = amount
                    Frequency = frequency
                    Executions = replayedOutcomes
                    NextTradeDate = rolled
                }

            let advanceFundPlanRow (planId: Guid, code: string, assetClass: string, amount: decimal, frequency: SipFrequency, anchor: DateOnly, nextDate: DateOnly) =
                let dueDates =
                    SipPolicy.advancePlan frequency anchor nextDate endDate
                    |> List.truncate (max 1 limit)

                let outcomes = ResizeArray<SipExecutionOutcome>()

                let upsertExecution (tradeDate: DateOnly) =
                    use insertCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            """
                            INSERT INTO sip_executions (plan_id, trade_date, amount, fee_amount, status)
                            VALUES (@plan_id, @trade_date, @amount, @fee_amount, 'processing')
                            ON CONFLICT (plan_id, trade_date) DO NOTHING
                            RETURNING trade_date
                            """

                    addParameter insertCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    addParameter insertCommand "trade_date" NpgsqlDbType.Date (box tradeDate) |> ignore
                    addParameter insertCommand "amount" NpgsqlDbType.Numeric (box amount) |> ignore
                    addParameter insertCommand "fee_amount" NpgsqlDbType.Numeric (box 0m) |> ignore

                    use reader = insertCommand.ExecuteReader()
                    let inserted = reader.Read()
                    reader.Close()
                    inserted

                let setExecution (tradeDate: DateOnly) (status: string) (orderId: Guid option) (reason: string option) =
                    use updateCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            """
                            UPDATE sip_executions
                            SET status = @status,
                                order_id = @order_id,
                                pending_reason = @reason,
                                executed_at = now()
                            WHERE plan_id = @plan_id AND trade_date = @trade_date
                            """

                    addParameter updateCommand "status" NpgsqlDbType.Text (box status) |> ignore

                    let orderParameter =
                        match orderId with
                        | Some value -> box value
                        | None -> box DBNull.Value

                    addParameter updateCommand "order_id" NpgsqlDbType.Uuid orderParameter |> ignore

                    let reasonParameter =
                        match reason with
                        | Some value -> box value
                        | None -> box DBNull.Value

                    addParameter updateCommand "reason" NpgsqlDbType.Text reasonParameter |> ignore
                    addParameter updateCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    addParameter updateCommand "trade_date" NpgsqlDbType.Date (box tradeDate) |> ignore
                    updateCommand.ExecuteNonQuery() |> ignore

                let findExistingExecution (tradeDate: DateOnly) =
                    use selectCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT status, order_id, pending_reason FROM sip_executions WHERE plan_id = @plan_id AND trade_date = @trade_date"

                    addParameter selectCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    addParameter selectCommand "trade_date" NpgsqlDbType.Date (box tradeDate) |> ignore

                    use reader = selectCommand.ExecuteReader()

                    if reader.Read() then
                        Some
                            (reader.GetString(0),
                             (if reader.IsDBNull(1) then None else Some(reader.GetGuid(1))),
                             readStringOption reader 2)
                    else
                        None

                let orderIdFor (tradeDate: DateOnly) =
                    let orderKey = sprintf "sip:%O:%s" planId (tradeDate.ToString("yyyy-MM-dd"))

                    match this.CreateSubscriptionOrder(orderKey, fundId, { FundCode = code; Amount = amount; FeeAmount = 0m }, tradeDate) with
                    | SubscriptionOrderWriteResult.OrderCreated order -> Some order.Id
                    | SubscriptionOrderWriteResult.OrderReplayed order -> Some order.Id
                    | SubscriptionOrderWriteResult.OrderInsufficientFunds -> None
                    | other -> failwithf "unexpected sip order result: %A" other

                for tradeDate in dueDates do
                    // 1. claim the slot atomically: same plan + same trade date runs once
                    if upsertExecution tradeDate then
                        // 2. place the order through the shared pipeline with a deterministic key
                        match orderIdFor tradeDate with
                        | None ->
                            setExecution tradeDate "insufficient_cash" None (Some "available cash is not enough for the scheduled amount")
                            outcomes.Add({ TradeDate = tradeDate; Status = "insufficient_cash"; OrderId = None; PendingReason = Some "available cash is not enough for the scheduled amount" })
                        | Some orderId ->
                            // 3. confirm through the shared confirmation pipeline
                            let confirmKey = sprintf "sip-confirm:%O:%s" planId (tradeDate.ToString("yyyy-MM-dd"))

                            match this.ConfirmSubscriptionOrder(confirmKey, fundId, orderId) with
                            | SubscriptionConfirmResult.OrderConfirmed _
                            | SubscriptionConfirmResult.ConfirmReplayed _ ->
                                setExecution tradeDate "succeeded" (Some orderId) None
                                outcomes.Add({ TradeDate = tradeDate; Status = "succeeded"; OrderId = Some orderId; PendingReason = None })
                            | SubscriptionConfirmResult.ConfirmPendingNav record ->
                                setExecution tradeDate "pending_nav" (Some orderId) record.PendingReason
                                outcomes.Add({ TradeDate = tradeDate; Status = "pending_nav"; OrderId = Some orderId; PendingReason = record.PendingReason })
                            | other ->
                                setExecution tradeDate "failed" (Some orderId) (Some (sprintf "%A" other))
                                outcomes.Add({ TradeDate = tradeDate; Status = "failed"; OrderId = Some orderId; PendingReason = Some (sprintf "%A" other) })
                    else
                        match findExistingExecution tradeDate with
                        | Some("succeeded", orderId, reason) ->
                            outcomes.Add({ TradeDate = tradeDate; Status = "succeeded"; OrderId = orderId; PendingReason = reason })
                        | Some(status, orderId, reason) ->
                            outcomes.Add({ TradeDate = tradeDate; Status = status; OrderId = orderId; PendingReason = reason })
                        | None ->
                            outcomes.Add({ TradeDate = tradeDate; Status = "unknown"; OrderId = None; PendingReason = None })

                // 4. roll the plan pointer forward past the processed window
                let rolled =
                    match dueDates with
                    | [] -> nextDate
                    | lastDueDates ->
                        SipPolicy.nextTradeDate frequency anchor ((List.last lastDueDates).AddDays 1)

                if not (List.isEmpty dueDates) then
                    use rollCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "UPDATE sip_plans SET next_trade_date = @next_date WHERE id = @plan_id"

                    addParameter rollCommand "next_date" NpgsqlDbType.Date (box rolled) |> ignore
                    addParameter rollCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    rollCommand.ExecuteNonQuery() |> ignore

                let replayedOutcomes =
                    if List.isEmpty dueDates then
                        // repeat drive with the same endDate: replay what was already processed
                        readExecutionsUpTo planId endDate
                    else
                        outcomes |> Seq.toList

                {
                    PlanId = planId
                    InstrumentCode = code
                    AssetClass = assetClass
                    Amount = amount
                    Frequency = frequency
                    Executions = replayedOutcomes
                    NextTradeDate = rolled
                }

            let advancePlanRow (planId: Guid, code: string, assetClass: string, amount: decimal, frequency: SipFrequency, anchor: DateOnly, nextDate: DateOnly) =
                if assetClass = "stock" then
                    advanceStockPlanRow (planId, code, assetClass, amount, frequency, anchor, nextDate)
                else
                    advanceFundPlanRow (planId, code, assetClass, amount, frequency, anchor, nextDate)

            let planResults = plans |> Seq.map advancePlanRow |> Seq.toList
            transaction.Commit()

            { FundId = fundId; Plans = planResults }
        with error ->
            try
                transaction.Rollback()
            with _ ->
                ()

            raise error

    member _.GetSipPlans(fundId: Guid) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT p.id, p.fund_id, p.instrument_code, p.asset_class, p.amount, p.frequency, p.status, p.is_synthetic,
                       p.anchor_date, p.next_trade_date, p.created_at,
                       e.status, e.trade_date
                FROM sip_plans p
                LEFT JOIN LATERAL (
                    SELECT status, trade_date FROM sip_executions
                    WHERE plan_id = p.id ORDER BY executed_at DESC, trade_date DESC LIMIT 1
                ) e ON true
                WHERE p.fund_id = @fund_id
                ORDER BY p.created_at DESC, p.id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<SipPlanRecord>()

        while reader.Read() do
            records.Add(sipPlanRecordFromReader reader)

        records |> Seq.toList

    member _.SetSipPlanStatus(fundId: Guid, planId: Guid, status: string) : SipPlanStatusResult =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()
        use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

        try
            use lockCommand =
                commandWithTransaction
                    connection
                    (Some transaction)
                    "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

            addParameter lockCommand "lock_key" NpgsqlDbType.Text (box (sprintf "sip-plan-status:%O" planId)) |> ignore
            lockCommand.ExecuteNonQuery() |> ignore

            match findSipPlan connection (Some transaction) planId with
            | Some plan when plan.FundId = fundId ->
                if plan.Status = status then
                    transaction.Commit()
                    SipPlanStatusResult.SipPlanStatusChanged plan
                else
                    use updateCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "UPDATE sip_plans SET status = @status WHERE id = @plan_id"

                    addParameter updateCommand "status" NpgsqlDbType.Text (box status) |> ignore
                    addParameter updateCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    updateCommand.ExecuteNonQuery() |> ignore

                    let updated = findSipPlan connection (Some transaction) planId
                    transaction.Commit()

                    match updated with
                    | Some updatedPlan -> SipPlanStatusResult.SipPlanStatusChanged updatedPlan
                    | None -> SipPlanStatusResult.SipPlanStatusNotFound
            | _ ->
                transaction.Rollback()
                SipPlanStatusResult.SipPlanStatusNotFound
        with error ->
            try
                transaction.Rollback()
            with _ ->
                ()

            raise error

    member _.CreateInvestmentPlan(idempotencyKey: string, fundId: Guid, command: InvestmentPlanCommand, ?anchorOverride: DateOnly) : InvestmentPlanWriteResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            InvestmentPlanWriteResult.InvestmentPlanInvalid "idempotency key cannot be empty"
        else
            match InvestmentPlanPolicy.validateAmount command.Amount with
            | Error message -> InvestmentPlanWriteResult.InvestmentPlanInvalid message
            | Ok() ->
                let fingerprint = investmentPlanRequestHash fundId command
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()
                use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                try
                    use lockCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                    addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                    lockCommand.ExecuteNonQuery() |> ignore

                    match findInvestmentPlanIdempotency connection (Some transaction) idempotencyKey with
                    | Some(existingHash, existingFundId, planId)
                        when existingHash = fingerprint && existingFundId = fundId ->
                        match findInvestmentPlan connection (Some transaction) planId with
                        | Some plan ->
                            transaction.Commit()
                            InvestmentPlanWriteResult.InvestmentPlanReplayed plan
                        | None ->
                            transaction.Rollback()
                            InvestmentPlanWriteResult.InvestmentPlanInvalid "idempotency record references a missing plan"
                    | Some _ ->
                        transaction.Rollback()
                        InvestmentPlanWriteResult.InvestmentPlanIdempotencyConflict
                    | None ->
                        match lockFundForOrder connection (Some transaction) fundId with
                        | None ->
                            transaction.Rollback()
                            InvestmentPlanWriteResult.InvestmentPlanFundNotFound
                        | Some isSynthetic ->
                            if instrumentExists connection (Some transaction) command.InstrumentCode then
                                let anchorDate =
                                    anchorOverride
                                    |> Option.defaultWith (fun () -> ConfirmationPolicy.tradeDateFor DateTimeOffset.UtcNow)

                                let plan: InvestmentPlanRecord =
                                    {
                                        Id = Guid.NewGuid()
                                        FundId = fundId
                                        InstrumentCode = command.InstrumentCode
                                        Amount = command.Amount
                                        Frequency = command.Frequency
                                        Status = "active"
                                        IsSynthetic = isSynthetic
                                        AnchorDate = anchorDate
                                        NextRunDate = InvestmentPlanPolicy.nextRunDate command.Frequency anchorDate anchorDate
                                        CreatedAt = DateTimeOffset.UtcNow
                                        LastRunStatus = None
                                        LastRunDate = None
                                    }

                                let createdAt = insertInvestmentPlan connection (Some transaction) plan
                                insertInvestmentPlanIdempotency connection (Some transaction) idempotencyKey fingerprint plan.Id fundId
                                transaction.Commit()
                                InvestmentPlanWriteResult.InvestmentPlanCreated { plan with CreatedAt = createdAt }
                            else
                                transaction.Rollback()
                                InvestmentPlanWriteResult.InvestmentPlanInstrumentNotFound
                with error ->
                    try
                        transaction.Rollback()
                    with _ ->
                        ()

                    raise error

    member _.GetInvestmentPlans(fundId: Guid) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT p.id, p.fund_id, p.instrument_code, p.amount, p.frequency, p.status, p.is_synthetic,
                       p.anchor_date, p.next_run_date, p.created_at,
                       r.status, r.run_date
                FROM investment_plans p
                LEFT JOIN LATERAL (
                    SELECT status, run_date FROM investment_plan_runs
                    WHERE plan_id = p.id ORDER BY executed_at DESC, run_date DESC LIMIT 1
                ) r ON true
                WHERE p.fund_id = @fund_id
                ORDER BY p.created_at DESC, p.id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<InvestmentPlanRecord>()

        while reader.Read() do
            records.Add(investmentPlanRecordFromReader reader)

        records |> Seq.toList

    member this.RunInvestmentPlans(fundId: Guid, processingDate: DateOnly) : InvestmentPlanRunResult =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

        try
            use lockCommand =
                commandWithTransaction
                    connection
                    (Some transaction)
                    "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

            addParameter lockCommand "lock_key" NpgsqlDbType.Text (box (sprintf "investment-plan-run:%O" fundId)) |> ignore
            lockCommand.ExecuteNonQuery() |> ignore

            // 0. retry phase: runs that were pending_nav get re-confirmed once their NAV landed
            use retryCommand =
                commandWithTransaction
                    connection
                    (Some transaction)
                    """
                    SELECT r.plan_id, r.run_date, r.order_id
                    FROM investment_plan_runs r
                    JOIN investment_plans p ON p.id = r.plan_id
                    WHERE p.fund_id = @fund_id AND r.status = 'pending_nav'
                    ORDER BY r.run_date
                    """

            addParameter retryCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

            use retryReader = retryCommand.ExecuteReader()
            let pendingRetries = ResizeArray<Guid * DateOnly * Guid>()

            while retryReader.Read() do
                pendingRetries.Add(
                    retryReader.GetGuid(0),
                    retryReader.GetFieldValue<DateOnly>(1),
                    retryReader.GetGuid(2)
                )

            retryReader.Close()

            for (retryPlanId, retryDate, retryOrderId) in pendingRetries do
                let confirmKey = sprintf "investment-plan-confirm:%O:%s" retryPlanId (retryDate.ToString("yyyy-MM-dd"))

                match this.ConfirmSubscriptionOrder(confirmKey, fundId, retryOrderId) with
                | SubscriptionConfirmResult.OrderConfirmed _
                | SubscriptionConfirmResult.ConfirmReplayed _ ->
                    use doneCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "UPDATE investment_plan_runs SET status = 'succeeded', pending_reason = NULL, executed_at = now() WHERE plan_id = @plan_id AND run_date = @run_date"

                    addParameter doneCommand "plan_id" NpgsqlDbType.Uuid (box retryPlanId) |> ignore
                    addParameter doneCommand "run_date" NpgsqlDbType.Date (box retryDate) |> ignore
                    doneCommand.ExecuteNonQuery() |> ignore
                | _ ->
                    // still pending: keep the run as pending_nav for the next drive
                    ()

            use plansCommand =
                commandWithTransaction
                    connection
                    (Some transaction)
                    "SELECT id, instrument_code, amount, frequency, anchor_date, next_run_date FROM investment_plans WHERE fund_id = @fund_id AND status = 'active' ORDER BY created_at"

            addParameter plansCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

            use plansReader = plansCommand.ExecuteReader()
            let plans = ResizeArray<Guid * string * decimal * InvestmentFrequency * DateOnly * DateOnly>()

            while plansReader.Read() do
                plans.Add(
                    plansReader.GetGuid(0),
                    plansReader.GetString(1),
                    plansReader.GetDecimal(2),
                    (match InvestmentPlanPolicy.parseFrequency (plansReader.GetString(3)) with
                     | Some frequency -> frequency
                     | None -> failwith "investment plan frequency is invalid"),
                    plansReader.GetFieldValue<DateOnly>(4),
                    plansReader.GetFieldValue<DateOnly>(5)
                )

            plansReader.Close()

            let readRunsUpTo (planId: Guid) (upTo: DateOnly) =
                use replayCommand =
                    commandWithTransaction
                        connection
                        (Some transaction)
                        """
                        SELECT run_date, status, order_id, pending_reason
                        FROM investment_plan_runs
                        WHERE plan_id = @plan_id AND run_date <= @up_to
                        ORDER BY run_date
                        """

                addParameter replayCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                addParameter replayCommand "up_to" NpgsqlDbType.Date (box upTo) |> ignore

                use reader = replayCommand.ExecuteReader()
                let rows = ResizeArray<InvestmentPlanRunOutcome>()

                while reader.Read() do
                    rows.Add(
                        {
                            RunDate = reader.GetFieldValue<DateOnly>(0)
                            Status = reader.GetString(1)
                            OrderId = (if reader.IsDBNull(2) then None else Some(reader.GetGuid(2)))
                            PendingReason = readStringOption reader 3
                        }
                    )

                rows |> Seq.toList

            let runPlanRow (planId: Guid, code: string, amount: decimal, frequency: InvestmentFrequency, anchor: DateOnly, nextDate: DateOnly) =
                let dueDates = InvestmentPlanPolicy.dueDates frequency anchor nextDate processingDate
                let outcomes = ResizeArray<InvestmentPlanRunOutcome>()

                let claimRun (runDate: DateOnly) =
                    use insertCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            """
                            INSERT INTO investment_plan_runs (plan_id, run_date, amount, fee_amount, status)
                            VALUES (@plan_id, @run_date, @amount, @fee_amount, 'processing')
                            ON CONFLICT (plan_id, run_date) DO NOTHING
                            RETURNING run_date
                            """

                    addParameter insertCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    addParameter insertCommand "run_date" NpgsqlDbType.Date (box runDate) |> ignore
                    addParameter insertCommand "amount" NpgsqlDbType.Numeric (box amount) |> ignore
                    addParameter insertCommand "fee_amount" NpgsqlDbType.Numeric (box 0m) |> ignore

                    use reader = insertCommand.ExecuteReader()
                    let inserted = reader.Read()
                    reader.Close()
                    inserted

                let setRun (runDate: DateOnly) (status: string) (orderId: Guid option) (reason: string option) =
                    use updateCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            """
                            UPDATE investment_plan_runs
                            SET status = @status,
                                order_id = @order_id,
                                pending_reason = @reason,
                                executed_at = now()
                            WHERE plan_id = @plan_id AND run_date = @run_date
                            """

                    addParameter updateCommand "status" NpgsqlDbType.Text (box status) |> ignore

                    let orderParameter =
                        match orderId with
                        | Some value -> box value
                        | None -> box DBNull.Value

                    addParameter updateCommand "order_id" NpgsqlDbType.Uuid orderParameter |> ignore

                    let reasonParameter =
                        match reason with
                        | Some value -> box value
                        | None -> box DBNull.Value

                    addParameter updateCommand "reason" NpgsqlDbType.Text reasonParameter |> ignore
                    addParameter updateCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    addParameter updateCommand "run_date" NpgsqlDbType.Date (box runDate) |> ignore
                    updateCommand.ExecuteNonQuery() |> ignore

                let findExistingRun (runDate: DateOnly) =
                    use selectCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT status, order_id, pending_reason FROM investment_plan_runs WHERE plan_id = @plan_id AND run_date = @run_date"

                    addParameter selectCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    addParameter selectCommand "run_date" NpgsqlDbType.Date (box runDate) |> ignore

                    use reader = selectCommand.ExecuteReader()

                    if reader.Read() then
                        Some
                            (reader.GetString(0),
                             (if reader.IsDBNull(1) then None else Some(reader.GetGuid(1))),
                             readStringOption reader 2)
                    else
                        None

                let orderIdFor (runDate: DateOnly) =
                    let orderKey = sprintf "investment-plan:%O:%s" planId (runDate.ToString("yyyy-MM-dd"))

                    match this.CreateSubscriptionOrder(orderKey, fundId, { FundCode = code; Amount = amount; FeeAmount = 0m }, runDate) with
                    | SubscriptionOrderWriteResult.OrderCreated order -> Some order.Id
                    | SubscriptionOrderWriteResult.OrderReplayed order -> Some order.Id
                    | SubscriptionOrderWriteResult.OrderInsufficientFunds -> None
                    | other -> failwithf "unexpected investment plan order result: %A" other

                for runDate in dueDates do
                    // 1. claim the slot atomically: same plan + same run date executes once
                    if claimRun runDate then
                        // 2. place the order through the shared pipeline with a deterministic key
                        match orderIdFor runDate with
                        | None ->
                            setRun runDate "insufficient_cash" None (Some "available cash is not enough for the scheduled amount")

                            outcomes.Add(
                                {
                                    RunDate = runDate
                                    Status = "insufficient_cash"
                                    OrderId = None
                                    PendingReason = Some "available cash is not enough for the scheduled amount"
                                }
                            )
                        | Some orderId ->
                            // 3. confirm through the shared confirmation pipeline
                            let confirmKey = sprintf "investment-plan-confirm:%O:%s" planId (runDate.ToString("yyyy-MM-dd"))

                            match this.ConfirmSubscriptionOrder(confirmKey, fundId, orderId) with
                            | SubscriptionConfirmResult.OrderConfirmed _
                            | SubscriptionConfirmResult.ConfirmReplayed _ ->
                                setRun runDate "succeeded" (Some orderId) None
                                outcomes.Add({ RunDate = runDate; Status = "succeeded"; OrderId = Some orderId; PendingReason = None })
                            | SubscriptionConfirmResult.ConfirmPendingNav record ->
                                setRun runDate "pending_nav" (Some orderId) record.PendingReason
                                outcomes.Add({ RunDate = runDate; Status = "pending_nav"; OrderId = Some orderId; PendingReason = record.PendingReason })
                            | other ->
                                setRun runDate "failed" (Some orderId) (Some(sprintf "%A" other))
                                outcomes.Add({ RunDate = runDate; Status = "failed"; OrderId = Some orderId; PendingReason = Some(sprintf "%A" other) })
                    else
                        match findExistingRun runDate with
                        | Some("succeeded", orderId, reason) ->
                            outcomes.Add({ RunDate = runDate; Status = "succeeded"; OrderId = orderId; PendingReason = reason })
                        | Some(status, orderId, reason) ->
                            outcomes.Add({ RunDate = runDate; Status = status; OrderId = orderId; PendingReason = reason })
                        | None ->
                            outcomes.Add({ RunDate = runDate; Status = "unknown"; OrderId = None; PendingReason = None })

                // 4. roll the plan pointer forward past the processed window
                let rolled =
                    match dueDates with
                    | [] -> nextDate
                    | lastDueDates -> InvestmentPlanPolicy.nextRunDate frequency anchor ((List.last lastDueDates).AddDays 1)

                if not (List.isEmpty dueDates) then
                    use rollCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "UPDATE investment_plans SET next_run_date = @next_date WHERE id = @plan_id"

                    addParameter rollCommand "next_date" NpgsqlDbType.Date (box rolled) |> ignore
                    addParameter rollCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    rollCommand.ExecuteNonQuery() |> ignore

                let replayedOutcomes =
                    if List.isEmpty dueDates then
                        // repeat drive with the same processing date: replay what was already executed
                        readRunsUpTo planId processingDate
                    else
                        outcomes |> Seq.toList

                {
                    PlanId = planId
                    InstrumentCode = code
                    Amount = amount
                    Frequency = frequency
                    Runs = replayedOutcomes
                    NextRunDate = rolled
                }

            let planResults = plans |> Seq.map runPlanRow |> Seq.toList
            transaction.Commit()

            { FundId = fundId; ProcessingDate = processingDate; Plans = planResults }
        with error ->
            try
                transaction.Rollback()
            with _ ->
                ()

            raise error

    member _.CreateRebalancePlan(idempotencyKey: string, fundId: Guid, command: RebalancePlanCommand) : RebalanceWriteResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            RebalanceWriteResult.RebalanceInvalid "idempotency key cannot be empty"
        else
            match validateRebalanceCommand command with
            | Error message -> RebalanceWriteResult.RebalanceInvalid message
            | Ok() ->
                let fingerprint = rebalanceRequestHash fundId command
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()
                use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                try
                    use lockCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                    addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                    lockCommand.ExecuteNonQuery() |> ignore

                    match findRebalanceIdempotency connection (Some transaction) idempotencyKey with
                    | Some(existingHash, existingFundId, planId)
                        when existingHash = fingerprint && existingFundId = fundId ->
                        match findRebalancePlan connection (Some transaction) planId with
                        | Some plan ->
                            transaction.Commit()
                            RebalanceWriteResult.RebalancePlanReplayed plan
                        | None ->
                            transaction.Rollback()
                            RebalanceWriteResult.RebalanceInvalid "idempotency record references a missing plan"
                    | Some _ ->
                        transaction.Rollback()
                        RebalanceWriteResult.RebalanceIdempotencyConflict
                    | None ->
                        match lockFundForOrder connection (Some transaction) fundId with
                        | None ->
                            transaction.Rollback()
                            RebalanceWriteResult.RebalanceFundNotFound
                        | Some isSynthetic ->
                            let missingTarget =
                                command.Targets
                                |> List.tryFind (fun target -> not (instrumentExists connection (Some transaction) target.InstrumentCode))

                            match missingTarget with
                            | Some target ->
                                transaction.Rollback()
                                RebalanceWriteResult.RebalanceInstrumentNotFound
                            | None ->
                                let plan: RebalancePlanRecord =
                                    {
                                        Id = Guid.NewGuid()
                                        FundId = fundId
                                        Targets = command.Targets
                                        Status = "active"
                                        IsSynthetic = isSynthetic
                                        CreatedAt = DateTimeOffset.UtcNow
                                    }

                                let createdAt = insertRebalancePlan connection (Some transaction) plan
                                insertRebalanceIdempotency connection (Some transaction) idempotencyKey fingerprint plan.Id fundId
                                transaction.Commit()
                                RebalanceWriteResult.RebalancePlanCreated { plan with CreatedAt = createdAt }
                with error ->
                    try
                        transaction.Rollback()
                    with _ ->
                        ()

                    raise error

    member _.GetRebalancePlans(fundId: Guid) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                "SELECT id, fund_id, status, is_synthetic, created_at FROM rebalance_plans WHERE fund_id = @fund_id ORDER BY created_at DESC, id"

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let plans = ResizeArray<RebalancePlanRecord>()

        while reader.Read() do
            plans.Add(rebalancePlanRecordFromReader reader)

        reader.Close()
        plans |> Seq.toList |> List.map (rebalancePlanWithTargets connection None)

    member _.ArchiveRebalancePlan(fundId: Guid, planId: Guid) : RebalanceArchiveResult =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()
        use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

        try
            use lockCommand =
                commandWithTransaction
                    connection
                    (Some transaction)
                    "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

            addParameter lockCommand "lock_key" NpgsqlDbType.Text (box (sprintf "rebalance-archive:%O" planId)) |> ignore
            lockCommand.ExecuteNonQuery() |> ignore

            match findRebalancePlan connection (Some transaction) planId with
            | Some plan when plan.FundId = fundId ->
                if plan.Status = "archived" then
                    transaction.Commit()
                    RebalanceArchiveResult.RebalancePlanArchived plan
                else
                    use updateCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "UPDATE rebalance_plans SET status = 'archived' WHERE id = @plan_id"

                    addParameter updateCommand "plan_id" NpgsqlDbType.Uuid (box planId) |> ignore
                    updateCommand.ExecuteNonQuery() |> ignore

                    let updated = findRebalancePlan connection (Some transaction) planId
                    transaction.Commit()

                    match updated with
                    | Some updatedPlan -> RebalanceArchiveResult.RebalancePlanArchived updatedPlan
                    | None -> RebalanceArchiveResult.RebalanceArchiveNotFound
            | _ ->
                transaction.Rollback()
                RebalanceArchiveResult.RebalanceArchiveNotFound
        with error ->
            try
                transaction.Rollback()
            with _ ->
                ()

            raise error

    member this.ExecuteRebalancePlan(planId: Guid) : Result<RebalanceExecutionResult, string> =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        let plan =
            use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

            try
                use lockCommand =
                    commandWithTransaction
                        connection
                        (Some transaction)
                        "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                addParameter lockCommand "lock_key" NpgsqlDbType.Text (box (sprintf "rebalance-execute:%O" planId)) |> ignore
                lockCommand.ExecuteNonQuery() |> ignore

                let plan = findRebalancePlan connection (Some transaction) planId
                transaction.Commit()
                plan
            with error ->
                try
                    transaction.Rollback()
                with _ ->
                    ()

                raise error

        match plan with
        | None -> Error "rebalance plan was not found"
        | Some plan when plan.Status = "archived" -> Error "rebalance plan is archived"
        | Some plan ->
            let fundId = plan.FundId
            let runDate = ConfirmationPolicy.tradeDateFor DateTimeOffset.UtcNow

            // snapshot: fund cash plus each holding valued at its latest valuation NAV
            let fund = this.GetFund fundId

            match fund with
            | None -> Error "fund was not found"
            | Some fund ->
                let positions = this.GetFundPositions fundId

                let buildSnapshot (position: FundPositionRecord) : RebalancePolicy.RebalancePositionSnapshot =
                    let marketValue =
                        match position.ValuationNav with
                        | Some nav -> Decimal.Round(position.Units * nav, 2)
                        | None -> 0m

                    {
                        RebalancePolicy.RebalancePositionSnapshot.InstrumentCode = position.InstrumentCode
                        RebalancePolicy.RebalancePositionSnapshot.MarketValue = marketValue
                        RebalancePolicy.RebalancePositionSnapshot.Units = position.Units
                        RebalancePolicy.RebalancePositionSnapshot.AvailableUnits = position.Units - position.ReservedUnits
                        RebalancePolicy.RebalancePositionSnapshot.ValuationNav = position.ValuationNav
                    }

                let snapshots = positions |> List.map buildSnapshot

                let diffs =
                    RebalancePolicy.computeOrders plan.Targets snapshots fund.AvailableCash

                match diffs with
                | Error message -> Error message
                | Ok diffs ->
                    let outcomes = ResizeArray<RebalanceOrderOutcome>()

                    // sells first so freed cash can fund the buys
                    let ordered =
                        diffs
                        |> List.sortBy (fun diff ->
                            match diff.Action with
                            | RebalancePolicy.Sell -> 0
                            | RebalancePolicy.Buy -> 1
                            | RebalancePolicy.Hold -> 2)

                    for diff: RebalancePolicy.RebalanceDiff in ordered do
                        match diff.Action with
                        | RebalancePolicy.Hold -> ()
                        | RebalancePolicy.Buy ->
                            let orderKey = RebalancePolicy.orderKey plan.Id runDate diff.InstrumentCode

                            match
                                this.CreateSubscriptionOrder(
                                    orderKey,
                                    fundId,
                                    { FundCode = diff.InstrumentCode; Amount = diff.Amount; FeeAmount = 0m }
                                )
                            with
                            | SubscriptionOrderWriteResult.OrderCreated order
                            | SubscriptionOrderWriteResult.OrderReplayed order ->
                                let confirmKey = RebalancePolicy.confirmKey plan.Id runDate diff.InstrumentCode

                                match this.ConfirmSubscriptionOrder(confirmKey, fundId, order.Id) with
                                | SubscriptionConfirmResult.OrderConfirmed _
                                | SubscriptionConfirmResult.ConfirmReplayed _ ->
                                    outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "buy"; Amount = cashText diff.Amount; Status = "succeeded"; OrderId = Some order.Id; PendingReason = None })
                                | SubscriptionConfirmResult.ConfirmPendingNav record ->
                                    outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "buy"; Amount = cashText diff.Amount; Status = "pending_nav"; OrderId = Some order.Id; PendingReason = record.PendingReason })
                                | SubscriptionConfirmResult.ConfirmIdempotencyConflict ->
                                    outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "buy"; Amount = cashText diff.Amount; Status = "idempotency_conflict"; OrderId = Some order.Id; PendingReason = None })
                                | other ->
                                    outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "buy"; Amount = cashText diff.Amount; Status = "failed"; OrderId = Some order.Id; PendingReason = Some (sprintf "%A" other) })
                            | SubscriptionOrderWriteResult.OrderInsufficientFunds ->
                                outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "buy"; Amount = cashText diff.Amount; Status = "insufficient_cash"; OrderId = None; PendingReason = Some "available cash is not enough for the rebalance buy" })
                            | other ->
                                outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "buy"; Amount = cashText diff.Amount; Status = "failed"; OrderId = None; PendingReason = Some (sprintf "%A" other) })
                        | RebalancePolicy.Sell ->
                            match diff.Units with
                            | None ->
                                outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "sell"; Amount = cashText diff.Amount; Status = "skipped_no_valuation"; OrderId = None; PendingReason = Some "holding has no valuation NAV to price the sell" })
                            | Some units when units <= 0m ->
                                outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "sell"; Amount = cashText diff.Amount; Status = "skipped_no_available_units"; OrderId = None; PendingReason = Some "no available units to redeem" })
                            | Some units ->
                                let redeemKey = RebalancePolicy.redemptionKey plan.Id runDate diff.InstrumentCode

                                match
                                    this.CreateRedemptionOrder(
                                        redeemKey,
                                        fundId,
                                        { InstrumentCode = diff.InstrumentCode; Units = units; FeeAmount = 0m }
                                    )
                                with
                                | RedemptionWriteResult.RedemptionCreated order
                                | RedemptionWriteResult.RedemptionReplayed order ->
                                    let confirmKey = RebalancePolicy.redemptionConfirmKey plan.Id runDate diff.InstrumentCode

                                    match this.ConfirmRedemptionOrder(confirmKey, fundId, order.Id) with
                                    | RedemptionConfirmResult.RedemptionConfirmed _
                                    | RedemptionConfirmResult.RedemptionConfirmReplayed _ ->
                                        outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "sell"; Amount = cashText diff.Amount; Status = "succeeded"; OrderId = Some order.Id; PendingReason = None })
                                    | RedemptionConfirmResult.RedemptionPendingNav record ->
                                        outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "sell"; Amount = cashText diff.Amount; Status = "pending_nav"; OrderId = Some order.Id; PendingReason = record.PendingReason })
                                    | other ->
                                        outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "sell"; Amount = cashText diff.Amount; Status = "failed"; OrderId = Some order.Id; PendingReason = Some (sprintf "%A" other) })
                                | RedemptionWriteResult.RedemptionInsufficientUnits ->
                                    outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "sell"; Amount = cashText diff.Amount; Status = "insufficient_units"; OrderId = None; PendingReason = Some "available units are not enough for the rebalance sell" })
                                | other ->
                                    outcomes.Add({ InstrumentCode = diff.InstrumentCode; Action = "sell"; Amount = cashText diff.Amount; Status = "failed"; OrderId = None; PendingReason = Some (sprintf "%A" other) })

                    let outcomeList = outcomes |> Seq.toList

                    use persistTransaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                    try
                        for outcome in outcomeList do
                            upsertRebalanceExecution connection (Some persistTransaction) plan.Id runDate outcome

                        persistTransaction.Commit()
                    with error ->
                        try
                            persistTransaction.Rollback()
                        with _ ->
                            ()

                        raise error

                    Ok
                        {
                            PlanId = plan.Id
                            RunDate = runDate
                            Outcomes = outcomeList
                        }

    member _.GetRebalanceExecutions(fundId: Guid) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT e.plan_id, e.run_date, e.instrument_code, e.action, e.amount, e.status, e.order_id, e.pending_reason, e.executed_at
                FROM rebalance_executions e
                JOIN rebalance_plans p ON p.id = e.plan_id
                WHERE p.fund_id = @fund_id
                ORDER BY e.executed_at DESC, e.run_date DESC, e.instrument_code
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<RebalanceExecutionRecord>()

        while reader.Read() do
            records.Add(rebalanceExecutionRecordFromReader reader)

        records |> Seq.toList

    member this.PreviewRebalancePlan(planId: Guid) : Result<RebalancePreview, string> =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        match findRebalancePlan connection None planId with
        | None -> Error "rebalance plan was not found"
        | Some plan when plan.Status = "archived" -> Error "rebalance plan is archived"
        | Some plan ->
            match this.GetFund plan.FundId with
            | None -> Error "fund was not found"
            | Some fund ->
                let positions = this.GetFundPositions plan.FundId

                let buildSnapshot (position: FundPositionRecord) : RebalancePolicy.RebalancePositionSnapshot =
                    let marketValue =
                        match position.ValuationNav with
                        | Some nav -> Decimal.Round(position.Units * nav, 2)
                        | None -> 0m

                    {
                        RebalancePolicy.RebalancePositionSnapshot.InstrumentCode = position.InstrumentCode
                        RebalancePolicy.RebalancePositionSnapshot.MarketValue = marketValue
                        RebalancePolicy.RebalancePositionSnapshot.Units = position.Units
                        RebalancePolicy.RebalancePositionSnapshot.AvailableUnits = position.Units - position.ReservedUnits
                        RebalancePolicy.RebalancePositionSnapshot.ValuationNav = position.ValuationNav
                    }

                let snapshots = positions |> List.map buildSnapshot

                match RebalancePolicy.weightRows plan.Targets snapshots fund.AvailableCash with
                | Error message -> Error message
                | Ok rows ->
                    let equity =
                        fund.AvailableCash + (snapshots |> List.sumBy (fun snapshot -> snapshot.MarketValue))

                    Ok
                        {
                            PlanId = plan.Id
                            RunDate = ConfirmationPolicy.tradeDateFor DateTimeOffset.UtcNow
                            AvailableCash = fund.AvailableCash
                            Equity = equity
                            Rows = rows
                        }

    member this.RegisterDividend(idempotencyKey: string, fundId: Guid, command: DividendCommand) : DividendWriteResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            DividendWriteResult.DividendInvalid "idempotency key cannot be empty"
        else
            let today = ConfirmationPolicy.tradeDateFor DateTimeOffset.UtcNow

            match validateDividendCommand today command with
            | Error message -> DividendWriteResult.DividendInvalid message
            | Ok() ->
                let schemeKey = dividendSchemeKey fundId command
                let fingerprint = dividendRequestHash fundId command
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()

                // Phase 1: claim the scheme atomically, validate, and book the payout
                let claimedStage =
                    use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                    try
                        use lockCommand =
                            commandWithTransaction
                                connection
                                (Some transaction)
                                "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                        addParameter lockCommand "lock_key" NpgsqlDbType.Text (box schemeKey) |> ignore
                        lockCommand.ExecuteNonQuery() |> ignore

                        match findDividendIdempotency connection (Some transaction) schemeKey with
                        | Some(existingHash, existingFundId, recordId) when existingFundId = fundId ->
                            if existingHash = fingerprint then
                                transaction.Commit()
                                StageReplay recordId
                            else
                                transaction.Rollback()
                                StageFail DividendWriteResult.DividendIdempotencyConflict
                        | Some _ ->
                            transaction.Rollback()
                            StageFail DividendWriteResult.DividendIdempotencyConflict
                        | None ->
                            match lockFundForOrder connection (Some transaction) fundId with
                            | None ->
                                transaction.Rollback()
                                StageFail DividendWriteResult.DividendFundNotFound
                            | Some isSynthetic ->
                                if not (instrumentExists connection (Some transaction) command.InstrumentCode) then
                                    transaction.Rollback()
                                    StageFail DividendWriteResult.DividendInstrumentNotFound
                                else
                                    use positionCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            "SELECT units FROM fund_positions WHERE fund_id = @fund_id AND instrument_code = @code FOR UPDATE"

                                    addParameter positionCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                    addParameter positionCommand "code" NpgsqlDbType.Text (box command.InstrumentCode) |> ignore

                                    use positionReader = positionCommand.ExecuteReader()
                                    let positionFound = positionReader.Read()
                                    let heldUnits = if positionFound then positionReader.GetDecimal(0) else 0m
                                    positionReader.Close()

                                    if not positionFound || heldUnits <= 0m then
                                        transaction.Rollback()
                                        StageFail DividendWriteResult.DividendNoHoldings
                                    else
                                        match DividendPolicy.computeCashPayout heldUnits command.Dps with
                                        | Error message ->
                                            transaction.Rollback()
                                            StageFail (DividendWriteResult.DividendInvalid message)
                                        | Ok payout ->
                                            use cashCommand =
                                                commandWithTransaction
                                                    connection
                                                    (Some transaction)
                                                    "UPDATE funds SET available_cash = available_cash + @gross WHERE id = @fund_id"

                                            addParameter cashCommand "gross" NpgsqlDbType.Numeric (box payout.GrossCash) |> ignore
                                            addParameter cashCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

                                            if cashCommand.ExecuteNonQuery() = 0 then
                                                transaction.Rollback()
                                                StageFail DividendWriteResult.DividendFundNotFound
                                            else
                                                let recordId = Guid.NewGuid()

                                                let record: DividendRecord =
                                                    {
                                                        Id = recordId
                                                        FundId = fundId
                                                        InstrumentCode = command.InstrumentCode
                                                        NavDate = command.NavDate
                                                        Dps = command.Dps
                                                        Mode = command.Mode
                                                        Status = (if command.Mode = DividendPolicy.Cash then "cash_credited" else "pending_nav")
                                                        IsSynthetic = isSynthetic
                                                        GrossCash = Some payout.GrossCash
                                                        CreditedUnits = None
                                                        CreditedInvested = None
                                                        OrderId = None
                                                        PendingReason = None
                                                        CreatedAt = DateTimeOffset.UtcNow
                                                    }

                                                let createdAt = insertDividendRecord connection (Some transaction) record
                                                insertDividendIdempotency connection (Some transaction) schemeKey fingerprint recordId fundId
                                                transaction.Commit()
                                                StageBooked { record with CreatedAt = createdAt }
                    with error ->
                        try
                            transaction.Rollback()
                        with _ ->
                            ()

                        raise error

                // Confirmation of the reinvestment order settles the dividend record: the
                // credited units/invested cash are persisted and the row is marked succeeded.
                let finalizeDividend (record: DividendRecord) (confirmed: SubscriptionOrderRecord) =
                    let units = confirmed.ConfirmedUnits |> Option.defaultValue 0m
                    let invested = confirmed.ConfirmedInvestedCash |> Option.defaultValue 0m

                    do
                        use finalizeConnection = new NpgsqlConnection(connectionString)
                        finalizeConnection.Open()

                        use finalizeTransaction = finalizeConnection.BeginTransaction(IsolationLevel.ReadCommitted)

                        use finalizeCommand =
                            commandWithTransaction
                                finalizeConnection
                                (Some finalizeTransaction)
                                """
                                UPDATE dividend_records
                                SET status = 'succeeded',
                                    credited_units = @units,
                                    credited_invested = @invested,
                                    pending_reason = NULL
                                WHERE id = @record_id
                                """

                        addParameter finalizeCommand "units" NpgsqlDbType.Numeric (box units) |> ignore
                        addParameter finalizeCommand "invested" NpgsqlDbType.Numeric (box invested) |> ignore
                        addParameter finalizeCommand "record_id" NpgsqlDbType.Uuid (box record.Id) |> ignore
                        finalizeCommand.ExecuteNonQuery() |> ignore
                        finalizeTransaction.Commit()

                    { record with Status = "succeeded"; CreditedUnits = Some units; CreditedInvested = Some invested }

                // Phase 2: replays never re-book; pending reinvestments retry their confirmation
                match claimedStage with
                | StageReplay recordId ->
                    let record =
                        match findDividendRecord connection None recordId with
                        | Some record -> record
                        | None -> failwith "idempotency scheme references a missing dividend"

                    match record.Status, record.OrderId with
                    | "pending_nav", Some orderId ->
                        let confirmKey = sprintf "dividend-confirm:%O:%s:%s:%s" fundId command.InstrumentCode (command.NavDate.ToString("yyyy-MM-dd")) (command.Dps.ToString("G29", CultureInfo.InvariantCulture))

                        match this.ConfirmSubscriptionOrder(confirmKey, fundId, orderId) with
                        | SubscriptionConfirmResult.OrderConfirmed confirmed
                        | SubscriptionConfirmResult.ConfirmReplayed confirmed ->
                            DividendCredited(finalizeDividend record confirmed)
                        | SubscriptionConfirmResult.ConfirmPendingNav _ ->
                            DividendReplayed record
                        | other ->
                            failwithf "unexpected dividend confirm replay result: %A" other
                    | _ ->
                        DividendReplayed record
                | StageFail failure -> failure
                | StageBooked record ->
                    if record.Mode = DividendPolicy.Cash then
                        DividendCredited record
                    else
                        let orderKey = sprintf "dividend:%O:%s:%s:%s" fundId command.InstrumentCode (command.NavDate.ToString("yyyy-MM-dd")) (command.Dps.ToString("G29", CultureInfo.InvariantCulture))
                        let confirmKey = sprintf "dividend-confirm:%O:%s:%s:%s" fundId command.InstrumentCode (command.NavDate.ToString("yyyy-MM-dd")) (command.Dps.ToString("G29", CultureInfo.InvariantCulture))

                        match
                            this.CreateSubscriptionOrder(
                                orderKey,
                                fundId,
                                { FundCode = command.InstrumentCode; Amount = record.GrossCash |> Option.defaultValue 0m; FeeAmount = 0m },
                                command.NavDate
                            )
                        with
                        | SubscriptionOrderWriteResult.OrderCreated order
                        | SubscriptionOrderWriteResult.OrderReplayed order ->
                            do
                                use bindConnection = new NpgsqlConnection(connectionString)
                                bindConnection.Open()

                                use bindTransaction = bindConnection.BeginTransaction(IsolationLevel.ReadCommitted)

                                use bindCommand =
                                    commandWithTransaction
                                        bindConnection
                                        (Some bindTransaction)
                                        "UPDATE dividend_records SET order_id = @order_id WHERE id = @record_id"

                                addParameter bindCommand "order_id" NpgsqlDbType.Uuid (box order.Id) |> ignore
                                addParameter bindCommand "record_id" NpgsqlDbType.Uuid (box record.Id) |> ignore
                                bindCommand.ExecuteNonQuery() |> ignore
                                bindTransaction.Commit()

                            let recordWithOrder = { record with OrderId = Some order.Id }

                            match this.ConfirmSubscriptionOrder(confirmKey, fundId, order.Id) with
                            | SubscriptionConfirmResult.OrderConfirmed confirmed
                            | SubscriptionConfirmResult.ConfirmReplayed confirmed ->
                                DividendCredited(finalizeDividend recordWithOrder confirmed)
                            | SubscriptionConfirmResult.ConfirmPendingNav pending ->
                                DividendPendingReinvest { recordWithOrder with PendingReason = pending.PendingReason }
                            | other ->
                                failwithf "unexpected dividend confirm result: %A" other
                        | other ->
                            failwithf "unexpected dividend order result: %A" other

    member _.GetDividendRecords(fundId: Guid) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT id, fund_id, instrument_code, nav_date, dps, mode, status, is_synthetic,
                       gross_cash, credited_units, credited_invested, order_id, pending_reason, created_at
                FROM dividend_records WHERE fund_id = @fund_id ORDER BY created_at DESC, id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<DividendRecord>()

        while reader.Read() do
            records.Add(dividendRecordFromReader reader)

        records |> Seq.toList

    member _.CreateCapitalDeposit(idempotencyKey: string, fundId: Guid, command: CapitalDepositCommand) : CapitalDepositWriteResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            CapitalDepositWriteResult.CapitalDepositInvalid "idempotency key cannot be empty"
        else
            match CapitalPolicy.validateDeposit command.Amount with
            | Error message -> CapitalDepositWriteResult.CapitalDepositInvalid message
            | Ok() ->
                let fingerprint = capitalDepositRequestHash fundId command
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()
                use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                try
                    use lockCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                    addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                    lockCommand.ExecuteNonQuery() |> ignore

                    match findCapitalDepositIdempotency connection (Some transaction) idempotencyKey with
                    | Some(existingHash, existingFundId, depositId)
                        when existingHash = fingerprint && existingFundId = fundId ->
                        match findCapitalDeposit connection (Some transaction) depositId with
                        | Some deposit ->
                            transaction.Commit()
                            CapitalDepositWriteResult.CapitalDepositReplayed deposit
                        | None ->
                            transaction.Rollback()
                            CapitalDepositWriteResult.CapitalDepositInvalid "idempotency record references a missing deposit"
                    | Some _ ->
                        transaction.Rollback()
                        CapitalDepositWriteResult.CapitalDepositIdempotencyConflict
                    | None ->
                        match lockFundForOrder connection (Some transaction) fundId with
                        | None ->
                            transaction.Rollback()
                            CapitalDepositWriteResult.CapitalDepositFundNotFound
                        | Some isSynthetic ->
                            use cashCommand =
                                commandWithTransaction
                                    connection
                                    (Some transaction)
                                    "UPDATE funds SET available_cash = available_cash + @amount WHERE id = @fund_id"

                            addParameter cashCommand "amount" NpgsqlDbType.Numeric (box command.Amount) |> ignore
                            addParameter cashCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

                            if cashCommand.ExecuteNonQuery() = 0 then
                                transaction.Rollback()
                                CapitalDepositWriteResult.CapitalDepositFundNotFound
                            else
                                let deposit: CapitalDepositRecord =
                                    {
                                        Id = Guid.NewGuid()
                                        FundId = fundId
                                        Amount = command.Amount
                                        Note = command.Note
                                        IsSynthetic = isSynthetic
                                        CreatedAt = DateTimeOffset.UtcNow
                                    }

                                let createdAt = insertCapitalDeposit connection (Some transaction) deposit
                                insertCapitalDepositIdempotency connection (Some transaction) idempotencyKey fingerprint deposit.Id fundId
                                transaction.Commit()
                                CapitalDepositWriteResult.CapitalDepositCreated { deposit with CreatedAt = createdAt }
                with error ->
                    try
                        transaction.Rollback()
                    with _ ->
                        ()

                    raise error

    member _.CreateStockTrade(idempotencyKey: string, fundId: Guid, command: StockTradeCommand, ?executedAtOverride: DateTimeOffset, ?debitAvailableCash: bool) : StockTradeWriteResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            StockTradeWriteResult.StockTradeInvalid "idempotency key cannot be empty"
        else
            let code = if isNull command.InstrumentCode then "" else command.InstrumentCode.Trim()

            if code.Length <> 6 || not (code |> Seq.forall Char.IsDigit) then
                StockTradeWriteResult.StockTradeInvalid "stock code must contain exactly six digits"
            elif command.Quantity <= 0m then
                StockTradeWriteResult.StockTradeInvalid "quantity must be positive"
            elif command.Price <= 0m then
                StockTradeWriteResult.StockTradeInvalid "price must be positive"
            else
                let normalized = { command with InstrumentCode = code }
                let fingerprint = stockTradeRequestHash fundId normalized
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()
                use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                try
                    use lockCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                    addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                    lockCommand.ExecuteNonQuery() |> ignore

                    match findStockTradeIdempotency connection (Some transaction) idempotencyKey with
                    | Some(existingHash, existingFundId, tradeId)
                        when existingHash = fingerprint && existingFundId = fundId ->
                        match findStockTrade connection (Some transaction) tradeId with
                        | Some trade ->
                            transaction.Commit()
                            StockTradeWriteResult.StockTradeReplayed trade
                        | None ->
                            transaction.Rollback()
                            StockTradeWriteResult.StockTradeInvalid "idempotency record references a missing trade"
                    | Some _ ->
                        transaction.Rollback()
                        StockTradeWriteResult.StockTradeIdempotencyConflict
                    | None ->
                        match lockFundForOrder connection (Some transaction) fundId with
                        | None ->
                            transaction.Rollback()
                            StockTradeWriteResult.StockTradeFundNotFound
                        | Some isSynthetic ->
                            let executedAt = defaultArg executedAtOverride DateTimeOffset.UtcNow
                            let costCash = Decimal.Round(normalized.Quantity * normalized.Price, 2, MidpointRounding.AwayFromZero)

                            let debited =
                                if defaultArg debitAvailableCash false then
                                    use cashCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            "UPDATE funds SET available_cash = available_cash - @cost WHERE id = @fund_id AND available_cash >= @cost"

                                    addParameter cashCommand "cost" NpgsqlDbType.Numeric (box costCash) |> ignore
                                    addParameter cashCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                    cashCommand.ExecuteNonQuery() = 1
                                else
                                    true

                            if not debited then
                                transaction.Rollback()

                                StockTradeWriteResult.StockTradeInsufficientFunds(
                                    sprintf
                                        "available cash is not enough for a stock purchase of %s"
                                        (costCash.ToString("0.00", CultureInfo.InvariantCulture))
                                )
                            else
                                let trade: StockTradeRecord =
                                    {
                                        Id = Guid.NewGuid()
                                        FundId = fundId
                                        InstrumentCode = normalized.InstrumentCode
                                        StockName = normalized.StockName
                                        Quantity = normalized.Quantity
                                        Price = normalized.Price
                                        CostCash = costCash
                                        IsSynthetic = isSynthetic
                                        ExecutedAt = executedAt
                                    }

                                insertStockTrade connection (Some transaction) trade
                                insertStockTradeIdempotency connection (Some transaction) idempotencyKey fingerprint trade.Id fundId

                                use positionCommand =
                                    commandWithTransaction
                                        connection
                                        (Some transaction)
                                        """
                                        INSERT INTO stock_positions
                                            (fund_id, instrument_code, stock_name, quantity, cost_cash, last_traded_at)
                                        VALUES (@fund_id, @code, @name, @quantity, @cost_cash, @last_traded_at)
                                        ON CONFLICT (fund_id, instrument_code) DO UPDATE
                                        SET quantity = stock_positions.quantity + EXCLUDED.quantity,
                                            cost_cash = stock_positions.cost_cash + EXCLUDED.cost_cash,
                                            stock_name = COALESCE(EXCLUDED.stock_name, stock_positions.stock_name),
                                            last_traded_at = EXCLUDED.last_traded_at
                                        """

                                addParameter positionCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                addParameter positionCommand "code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore

                                let nameParameter =
                                    match normalized.StockName with
                                    | Some name -> box name
                                    | None -> box DBNull.Value

                                addParameter positionCommand "name" NpgsqlDbType.Text nameParameter |> ignore
                                addParameter positionCommand "quantity" NpgsqlDbType.Numeric (box normalized.Quantity) |> ignore
                                addParameter positionCommand "cost_cash" NpgsqlDbType.Numeric (box costCash) |> ignore
                                addParameter positionCommand "last_traded_at" NpgsqlDbType.TimestampTz (box executedAt) |> ignore
                                positionCommand.ExecuteNonQuery() |> ignore

                                let buyEvent =
                                    stockCashflowEvent
                                        fundId
                                        normalized.InstrumentCode
                                        normalized.StockName
                                        "buy"
                                        (DateOnly.FromDateTime executedAt.UtcDateTime)
                                        normalized.Quantity
                                        costCash
                                        None
                                        isSynthetic

                                insertStockCashflow connection (Some transaction) buyEvent

                                let persisted = { trade with ExecutedAt = executedAt }
                                transaction.Commit()
                                StockTradeWriteResult.StockTradeCreated persisted
                with error ->
                    try
                        transaction.Rollback()
                    with _ ->
                        ()

                    raise error

    member _.GetStockTrades(fundId: Guid) : StockTradeRecord list =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT id, fund_id, instrument_code, stock_name, quantity, price, cost_cash, is_synthetic, executed_at
                FROM stock_trades
                WHERE fund_id = @fund_id
                ORDER BY executed_at, id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<StockTradeRecord>()

        while reader.Read() do
            records.Add(stockTradeRecordFromReader reader)

        records |> Seq.toList

    member _.GetStockPositions(fundId: Guid) : StockPositionRecord list =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT instrument_code, stock_name, quantity, cost_cash, last_traded_at
                FROM stock_positions
                WHERE fund_id = @fund_id
                ORDER BY instrument_code
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<StockPositionRecord>()

        while reader.Read() do
            records.Add(
                {
                    FundId = fundId
                    InstrumentCode = reader.GetString(0)
                    StockName = if reader.IsDBNull(1) then None else Some(reader.GetString(1))
                    Quantity = reader.GetDecimal(2)
                    CostCash = reader.GetDecimal(3)
                    LastTradedAt = reader.GetFieldValue<DateTimeOffset>(4)
                }
            )

        records |> Seq.toList

    member _.GetStockSells(fundId: Guid) : StockSellRecord list =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT id, fund_id, instrument_code, stock_name, quantity, price, fee_amount, proceeds, is_synthetic, executed_at
                FROM stock_sells
                WHERE fund_id = @fund_id
                ORDER BY executed_at, id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<StockSellRecord>()

        while reader.Read() do
            records.Add(stockSellRecordFromReader reader)

        records |> Seq.toList

    member _.RecordStockCashflow(idempotencyKey: string, fundId: Guid, command: StockCashflowCommand) : StockCashflowWriteResult =
        let code = if isNull command.InstrumentCode then "" else command.InstrumentCode.Trim()
        let eventType = if isNull command.EventType then "" else command.EventType.Trim().ToLowerInvariant()

        if String.IsNullOrWhiteSpace idempotencyKey then
            StockCashflowWriteResult.StockCashflowInvalid "idempotency key cannot be empty"
        elif code.Length <> 6 || not (code |> Seq.forall Char.IsDigit) then
            StockCashflowWriteResult.StockCashflowInvalid "stock code must contain exactly six digits"
        elif eventType <> "buy" && eventType <> "sell" && eventType <> "dividend" then
            StockCashflowWriteResult.StockCashflowInvalid "event type must be buy, sell or dividend"
        elif command.Quantity < 0m then
            StockCashflowWriteResult.StockCashflowInvalid "quantity cannot be negative"
        elif command.Amount < 0m then
            StockCashflowWriteResult.StockCashflowInvalid "amount cannot be negative"
        else
            let normalized = { command with InstrumentCode = code; EventType = eventType }
            let fingerprint = stockCashflowRequestHash fundId normalized
            use connection = new NpgsqlConnection(connectionString)
            connection.Open()
            use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

            try
                use lockCommand =
                    commandWithTransaction
                        connection
                        (Some transaction)
                        "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                lockCommand.ExecuteNonQuery() |> ignore

                match findStockCashflowIdempotency connection (Some transaction) idempotencyKey with
                | Some(existingHash, existingFundId, eventId)
                    when existingHash = fingerprint && existingFundId = fundId ->
                    match findStockCashflow connection (Some transaction) eventId with
                    | Some record ->
                        transaction.Commit()
                        StockCashflowWriteResult.StockCashflowReplayed record
                    | None ->
                        transaction.Rollback()
                        StockCashflowWriteResult.StockCashflowInvalid "idempotency record references a missing event"
                | Some _ ->
                    transaction.Rollback()
                    StockCashflowWriteResult.StockCashflowIdempotencyConflict
                | None ->
                    match lockFundForOrder connection (Some transaction) fundId with
                    | None ->
                        transaction.Rollback()
                        StockCashflowWriteResult.StockCashflowFundNotFound
                    | Some isSynthetic ->
                        let record =
                            stockCashflowEvent
                                fundId
                                normalized.InstrumentCode
                                normalized.StockName
                                normalized.EventType
                                normalized.EventDate
                                normalized.Quantity
                                normalized.Amount
                                normalized.Note
                                isSynthetic

                        insertStockCashflow connection (Some transaction) record
                        insertStockCashflowIdempotency connection (Some transaction) idempotencyKey fingerprint record.Id fundId
                        transaction.Commit()
                        StockCashflowWriteResult.StockCashflowCreated record
            with error ->
                try
                    transaction.Rollback()
                with _ ->
                    ()

                raise error

    member _.GetStockCashflows(fundId: Guid) : StockCashflowRecord list =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                $"""
                SELECT {stockCashflowColumns}
                FROM stock_cashflow_events
                WHERE fund_id = @fund_id
                ORDER BY event_date, created_at, id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<StockCashflowRecord>()

        while reader.Read() do
            records.Add(stockCashflowRecordFromReader reader)

        records |> Seq.toList

    member _.CreateStockSell(idempotencyKey: string, fundId: Guid, command: StockSellCommand, ?executedAtOverride: DateTimeOffset) : StockSellWriteResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            StockSellWriteResult.StockSellInvalid "idempotency key cannot be empty"
        else
            let code = if isNull command.InstrumentCode then "" else command.InstrumentCode.Trim()

            if code.Length <> 6 || not (code |> Seq.forall Char.IsDigit) then
                StockSellWriteResult.StockSellInvalid "stock code must contain exactly six digits"
            elif command.Quantity <= 0m then
                StockSellWriteResult.StockSellInvalid "quantity must be positive"
            elif command.Price <= 0m then
                StockSellWriteResult.StockSellInvalid "price must be positive"
            elif command.FeeAmount < 0m then
                StockSellWriteResult.StockSellInvalid "fee amount cannot be negative"
            elif Decimal.Round(command.FeeAmount, 2) <> command.FeeAmount then
                StockSellWriteResult.StockSellInvalid "fee amount exceeds cash precision"
            else
                let normalized = { command with InstrumentCode = code }
                let gross = Decimal.Round(normalized.Quantity * normalized.Price, 2, MidpointRounding.AwayFromZero)

                if normalized.FeeAmount > gross then
                    StockSellWriteResult.StockSellInvalid "fee amount cannot exceed the sale proceeds"
                else
                    let fingerprint = stockSellRequestHash fundId normalized
                    use connection = new NpgsqlConnection(connectionString)
                    connection.Open()
                    use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                    try
                        use lockCommand =
                            commandWithTransaction
                                connection
                                (Some transaction)
                                "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                        addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                        lockCommand.ExecuteNonQuery() |> ignore

                        match findStockSellIdempotency connection (Some transaction) idempotencyKey with
                        | Some(existingHash, existingFundId, sellId)
                            when existingHash = fingerprint && existingFundId = fundId ->
                            match findStockSell connection (Some transaction) sellId with
                            | Some sell ->
                                transaction.Commit()
                                StockSellWriteResult.StockSellReplayed sell
                            | None ->
                                transaction.Rollback()
                                StockSellWriteResult.StockSellInvalid "idempotency record references a missing sale"
                        | Some _ ->
                            transaction.Rollback()
                            StockSellWriteResult.StockSellIdempotencyConflict
                        | None ->
                            match lockFundForOrder connection (Some transaction) fundId with
                            | None ->
                                transaction.Rollback()
                                StockSellWriteResult.StockSellFundNotFound
                            | Some isSynthetic ->
                                let position =
                                    use positionCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            SELECT quantity, cost_cash
                                            FROM stock_positions
                                            WHERE fund_id = @fund_id AND instrument_code = @instrument_code
                                            FOR UPDATE
                                            """

                                    addParameter positionCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                    addParameter positionCommand "instrument_code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore

                                    use reader = positionCommand.ExecuteReader()

                                    if reader.Read() then
                                        Some(reader.GetDecimal(0), reader.GetDecimal(1))
                                    else
                                        None

                                match position with
                                | None ->
                                    transaction.Rollback()
                                    StockSellWriteResult.StockSellInsufficientHoldings(sprintf "no stock position in %s to sell" normalized.InstrumentCode)
                                | Some(heldQuantity, _) when heldQuantity < normalized.Quantity ->
                                    transaction.Rollback()

                                    StockSellWriteResult.StockSellInsufficientHoldings(
                                        sprintf
                                            "available holdings %s are not enough for the requested sale quantity %s"
                                            (heldQuantity.ToString("G29", CultureInfo.InvariantCulture))
                                            (normalized.Quantity.ToString("G29", CultureInfo.InvariantCulture))
                                    )
                                | Some(heldQuantity, heldCost) ->
                                    let executedAt = defaultArg executedAtOverride DateTimeOffset.UtcNow
                                    let proceeds = gross - normalized.FeeAmount
                                    let remainingQuantity = heldQuantity - normalized.Quantity

                                    let releasedCost =
                                        if remainingQuantity <= 0m then
                                            heldCost
                                        else
                                            Decimal.Round(heldCost * (normalized.Quantity / heldQuantity), 2, MidpointRounding.AwayFromZero)

                                    if remainingQuantity <= 0m then
                                        use deleteCommand =
                                            commandWithTransaction
                                                connection
                                                (Some transaction)
                                                "DELETE FROM stock_positions WHERE fund_id = @fund_id AND instrument_code = @instrument_code"

                                        addParameter deleteCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                        addParameter deleteCommand "instrument_code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore
                                        deleteCommand.ExecuteNonQuery() |> ignore
                                    else
                                        use updateCommand =
                                            commandWithTransaction
                                                connection
                                                (Some transaction)
                                                """
                                                UPDATE stock_positions
                                                SET quantity = @quantity,
                                                    cost_cash = @cost_cash,
                                                    last_traded_at = @last_traded_at
                                                WHERE fund_id = @fund_id AND instrument_code = @instrument_code
                                                """

                                        addParameter updateCommand "quantity" NpgsqlDbType.Numeric (box remainingQuantity) |> ignore
                                        addParameter updateCommand "cost_cash" NpgsqlDbType.Numeric (box (max 0m (heldCost - releasedCost))) |> ignore
                                        addParameter updateCommand "last_traded_at" NpgsqlDbType.TimestampTz (box executedAt) |> ignore
                                        addParameter updateCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                        addParameter updateCommand "instrument_code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore
                                        updateCommand.ExecuteNonQuery() |> ignore

                                    use cashCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            "UPDATE funds SET available_cash = available_cash + @proceeds WHERE id = @fund_id"

                                    addParameter cashCommand "proceeds" NpgsqlDbType.Numeric (box proceeds) |> ignore
                                    addParameter cashCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                    cashCommand.ExecuteNonQuery() |> ignore

                                    let sell: StockSellRecord =
                                        {
                                            Id = Guid.NewGuid()
                                            FundId = fundId
                                            InstrumentCode = normalized.InstrumentCode
                                            StockName = normalized.StockName
                                            Quantity = normalized.Quantity
                                            Price = normalized.Price
                                            FeeAmount = normalized.FeeAmount
                                            Proceeds = proceeds
                                            IsSynthetic = isSynthetic
                                            ExecutedAt = executedAt
                                        }

                                    insertStockSell connection (Some transaction) sell
                                    insertStockSellIdempotency connection (Some transaction) idempotencyKey fingerprint sell.Id fundId

                                    let sellEvent =
                                        stockCashflowEvent
                                            fundId
                                            normalized.InstrumentCode
                                            normalized.StockName
                                            "sell"
                                            (DateOnly.FromDateTime executedAt.UtcDateTime)
                                            normalized.Quantity
                                            proceeds
                                            None
                                            isSynthetic

                                    insertStockCashflow connection (Some transaction) sellEvent

                                    transaction.Commit()
                                    StockSellWriteResult.StockSellCreated sell
                    with error ->
                        try
                            transaction.Rollback()
                        with _ ->
                            ()

                        raise error

    member _.CreateBondTrade(idempotencyKey: string, fundId: Guid, command: BondTradeCommand, ?executedAtOverride: DateTimeOffset) : BondTradeWriteResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            BondTradeWriteResult.BondTradeInvalid "idempotency key cannot be empty"
        else
            let code = if isNull command.InstrumentCode then "" else command.InstrumentCode.Trim()

            if code.Length <> 6 || not (code |> Seq.forall Char.IsDigit) then
                BondTradeWriteResult.BondTradeInvalid "bond code must contain exactly six digits"
            elif command.Quantity <= 0m then
                BondTradeWriteResult.BondTradeInvalid "quantity must be positive"
            elif command.Price <= 0m then
                BondTradeWriteResult.BondTradeInvalid "price must be positive"
            elif command.CleanPrice <= 0m then
                BondTradeWriteResult.BondTradeInvalid "clean price must be positive"
            elif command.ParValue <= 0m then
                BondTradeWriteResult.BondTradeInvalid "par value must be positive"
            elif command.AccruedInterest < 0m then
                BondTradeWriteResult.BondTradeInvalid "accrued interest cannot be negative"
            else
                let normalized = { command with InstrumentCode = code }
                let fingerprint = bondTradeRequestHash fundId normalized
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()
                use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                try
                    use lockCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                    addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                    lockCommand.ExecuteNonQuery() |> ignore

                    match findBondTradeIdempotency connection (Some transaction) idempotencyKey with
                    | Some(existingHash, existingFundId, tradeId)
                        when existingHash = fingerprint && existingFundId = fundId ->
                        match findBondTrade connection (Some transaction) tradeId with
                        | Some trade ->
                            transaction.Commit()
                            BondTradeWriteResult.BondTradeReplayed trade
                        | None ->
                            transaction.Rollback()
                            BondTradeWriteResult.BondTradeInvalid "idempotency record references a missing trade"
                    | Some _ ->
                        transaction.Rollback()
                        BondTradeWriteResult.BondTradeIdempotencyConflict
                    | None ->
                        match lockFundForOrder connection (Some transaction) fundId with
                        | None ->
                            transaction.Rollback()
                            BondTradeWriteResult.BondTradeFundNotFound
                        | Some isSynthetic ->
                            let executedAt = defaultArg executedAtOverride DateTimeOffset.UtcNow

                            let costCash =
                                Decimal.Round(
                                    normalized.Quantity * normalized.Price * normalized.ParValue / 100m,
                                    2,
                                    MidpointRounding.AwayFromZero
                                )

                            let trade: BondTradeRecord =
                                {
                                    Id = Guid.NewGuid()
                                    FundId = fundId
                                    InstrumentCode = normalized.InstrumentCode
                                    BondName = normalized.BondName
                                    Quantity = normalized.Quantity
                                    Price = normalized.Price
                                    CleanPrice = normalized.CleanPrice
                                    AccruedInterest = normalized.AccruedInterest
                                    ParValue = normalized.ParValue
                                    SettlementDate = normalized.SettlementDate
                                    CouponRate = normalized.CouponRate
                                    ValueDate = normalized.ValueDate
                                    MaturityDate = normalized.MaturityDate
                                    TradeDate = normalized.TradeDate |> Option.defaultValue normalized.SettlementDate
                                    CostCash = costCash
                                    IsSynthetic = isSynthetic
                                    ExecutedAt = executedAt
                                }

                            insertBondTrade connection (Some transaction) trade
                            insertBondTradeIdempotency connection (Some transaction) idempotencyKey fingerprint trade.Id fundId

                            use positionCommand =
                                commandWithTransaction
                                    connection
                                    (Some transaction)
                                    """
                                    INSERT INTO bond_positions
                                        (fund_id, instrument_code, bond_name, quantity, cost_cash, last_traded_at)
                                    VALUES (@fund_id, @code, @name, @quantity, @cost_cash, @last_traded_at)
                                    ON CONFLICT (fund_id, instrument_code) DO UPDATE
                                    SET quantity = bond_positions.quantity + EXCLUDED.quantity,
                                        cost_cash = bond_positions.cost_cash + EXCLUDED.cost_cash,
                                        bond_name = COALESCE(EXCLUDED.bond_name, bond_positions.bond_name),
                                        last_traded_at = EXCLUDED.last_traded_at
                                    """

                            addParameter positionCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                            addParameter positionCommand "code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore

                            let nameParameter =
                                match normalized.BondName with
                                | Some name -> box name
                                | None -> box DBNull.Value

                            addParameter positionCommand "name" NpgsqlDbType.Text nameParameter |> ignore
                            addParameter positionCommand "quantity" NpgsqlDbType.Numeric (box normalized.Quantity) |> ignore
                            addParameter positionCommand "cost_cash" NpgsqlDbType.Numeric (box costCash) |> ignore
                            addParameter positionCommand "last_traded_at" NpgsqlDbType.TimestampTz (box executedAt) |> ignore
                            positionCommand.ExecuteNonQuery() |> ignore

                            transaction.Commit()
                            BondTradeWriteResult.BondTradeCreated trade
                with error ->
                    try
                        transaction.Rollback()
                    with _ ->
                        ()

                    raise error

    member _.GetBondTrades(fundId: Guid) : BondTradeRecord list =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                $"""
                SELECT {bondTradeColumns}
                FROM bond_trades
                WHERE fund_id = @fund_id
                ORDER BY executed_at, id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<BondTradeRecord>()

        while reader.Read() do
            records.Add(bondTradeRecordFromReader reader)

        records |> Seq.toList

    member _.RecordBondCashflow(idempotencyKey: string, fundId: Guid, command: BondCashflowCommand) : BondCashflowWriteResult =
        let code = if isNull command.InstrumentCode then "" else command.InstrumentCode.Trim()
        let eventType = if isNull command.EventType then "" else command.EventType.Trim().ToLowerInvariant()

        if String.IsNullOrWhiteSpace idempotencyKey then
            BondCashflowWriteResult.BondCashflowInvalid "idempotency key cannot be empty"
        elif code.Length <> 6 || not (code |> Seq.forall Char.IsDigit) then
            BondCashflowWriteResult.BondCashflowInvalid "bond code must contain exactly six digits"
        elif eventType <> "coupon" && eventType <> "maturity" && eventType <> "redemption" then
            BondCashflowWriteResult.BondCashflowInvalid "event type must be coupon, maturity or redemption"
        elif command.Quantity <= 0m then
            BondCashflowWriteResult.BondCashflowInvalid "quantity must be positive"
        elif command.Amount < 0m then
            BondCashflowWriteResult.BondCashflowInvalid "amount cannot be negative"
        else
            let normalized = { command with InstrumentCode = code; EventType = eventType }
            let fingerprint = bondCashflowRequestHash fundId normalized
            use connection = new NpgsqlConnection(connectionString)
            connection.Open()
            use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

            try
                use lockCommand =
                    commandWithTransaction
                        connection
                        (Some transaction)
                        "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                lockCommand.ExecuteNonQuery() |> ignore

                match findBondCashflowIdempotency connection (Some transaction) idempotencyKey with
                | Some(existingHash, existingFundId, eventId)
                    when existingHash = fingerprint && existingFundId = fundId ->
                    match findBondCashflow connection (Some transaction) eventId with
                    | Some record ->
                        transaction.Commit()
                        BondCashflowWriteResult.BondCashflowReplayed record
                    | None ->
                        transaction.Rollback()
                        BondCashflowWriteResult.BondCashflowInvalid "idempotency record references a missing event"
                | Some _ ->
                    transaction.Rollback()
                    BondCashflowWriteResult.BondCashflowIdempotencyConflict
                | None ->
                    match lockFundForOrder connection (Some transaction) fundId with
                    | None ->
                        transaction.Rollback()
                        BondCashflowWriteResult.BondCashflowFundNotFound
                    | Some isSynthetic ->
                        let hasPosition =
                            use positionQuery =
                                commandWithTransaction
                                    connection
                                    (Some transaction)
                                    "SELECT 1 FROM bond_positions WHERE fund_id = @fund_id AND instrument_code = @code"

                            addParameter positionQuery "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                            addParameter positionQuery "code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore
                            use reader = positionQuery.ExecuteReader()
                            reader.Read()

                        if not hasPosition then
                            transaction.Rollback()
                            BondCashflowWriteResult.BondCashflowPositionNotFound
                        else
                            let record: BondCashflowRecord =
                                {
                                    Id = Guid.NewGuid()
                                    FundId = fundId
                                    InstrumentCode = normalized.InstrumentCode
                                    BondName = normalized.BondName
                                    EventType = normalized.EventType
                                    EventDate = normalized.EventDate
                                    Quantity = normalized.Quantity
                                    Amount = normalized.Amount
                                    Note = normalized.Note
                                    IsSynthetic = isSynthetic
                                    CreatedAt = DateTimeOffset.UtcNow
                                }

                            insertBondCashflow connection (Some transaction) record
                            insertBondCashflowIdempotency connection (Some transaction) idempotencyKey fingerprint record.Id fundId

                            use cashCommand =
                                commandWithTransaction
                                    connection
                                    (Some transaction)
                                    "UPDATE funds SET available_cash = available_cash + @amount WHERE id = @fund_id"

                            addParameter cashCommand "amount" NpgsqlDbType.Numeric (box normalized.Amount) |> ignore
                            addParameter cashCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                            cashCommand.ExecuteNonQuery() |> ignore

                            if normalized.EventType = "maturity" || normalized.EventType = "redemption" then
                                use removeCommand =
                                    commandWithTransaction
                                        connection
                                        (Some transaction)
                                        "DELETE FROM bond_positions WHERE fund_id = @fund_id AND instrument_code = @code"

                                addParameter removeCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                addParameter removeCommand "code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore
                                removeCommand.ExecuteNonQuery() |> ignore

                            transaction.Commit()
                            BondCashflowWriteResult.BondCashflowCreated record
            with error ->
                try
                    transaction.Rollback()
                with _ ->
                    ()

                raise error

    member _.GetBondCashflows(fundId: Guid) : BondCashflowRecord list =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                $"""
                SELECT {bondCashflowColumns}
                FROM bond_cashflow_events
                WHERE fund_id = @fund_id
                ORDER BY event_date, created_at, id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<BondCashflowRecord>()

        while reader.Read() do
            records.Add(bondCashflowRecordFromReader reader)

        records |> Seq.toList

    member _.CreateBondSell(idempotencyKey: string, fundId: Guid, command: BondSellCommand, ?executedAtOverride: DateTimeOffset) : BondSellWriteResult =
        let code = if isNull command.InstrumentCode then "" else command.InstrumentCode.Trim()

        if String.IsNullOrWhiteSpace idempotencyKey then
            BondSellWriteResult.BondSellInvalid "idempotency key cannot be empty"
        elif code.Length <> 6 || not (code |> Seq.forall Char.IsDigit) then
            BondSellWriteResult.BondSellInvalid "bond code must contain exactly six digits"
        elif command.Quantity <= 0m then
            BondSellWriteResult.BondSellInvalid "quantity must be positive"
        elif command.Price <= 0m then
            BondSellWriteResult.BondSellInvalid "price must be positive"
        elif command.CleanPrice <= 0m then
            BondSellWriteResult.BondSellInvalid "clean price must be positive"
        elif command.ParValue <= 0m then
            BondSellWriteResult.BondSellInvalid "par value must be positive"
        elif command.AccruedInterest < 0m then
            BondSellWriteResult.BondSellInvalid "accrued interest cannot be negative"
        elif command.FeeAmount < 0m then
            BondSellWriteResult.BondSellInvalid "fee cannot be negative"
        else
            let normalized = { command with InstrumentCode = code }
            let fingerprint = bondSellRequestHash fundId normalized
            use connection = new NpgsqlConnection(connectionString)
            connection.Open()
            use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

            try
                use lockCommand =
                    commandWithTransaction
                        connection
                        (Some transaction)
                        "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                lockCommand.ExecuteNonQuery() |> ignore

                match findBondSellIdempotency connection (Some transaction) idempotencyKey with
                | Some(existingHash, existingFundId, sellId)
                    when existingHash = fingerprint && existingFundId = fundId ->
                    match findBondSell connection (Some transaction) sellId with
                    | Some record ->
                        transaction.Commit()
                        BondSellWriteResult.BondSellReplayed record
                    | None ->
                        transaction.Rollback()
                        BondSellWriteResult.BondSellInvalid "idempotency record references a missing sell"
                | Some _ ->
                    transaction.Rollback()
                    BondSellWriteResult.BondSellIdempotencyConflict
                | None ->
                    match lockFundForOrder connection (Some transaction) fundId with
                    | None ->
                        transaction.Rollback()
                        BondSellWriteResult.BondSellFundNotFound
                    | Some isSynthetic ->
                        let position =
                            use positionQuery =
                                commandWithTransaction
                                    connection
                                    (Some transaction)
                                    "SELECT quantity, cost_cash FROM bond_positions WHERE fund_id = @fund_id AND instrument_code = @code FOR UPDATE"

                            addParameter positionQuery "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                            addParameter positionQuery "code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore
                            use reader = positionQuery.ExecuteReader()
                            if reader.Read() then Some(reader.GetDecimal(0), reader.GetDecimal(1)) else None

                        match position with
                        | None ->
                            transaction.Rollback()
                            BondSellWriteResult.BondSellInsufficientHoldings "fund does not hold this bond"
                        | Some(positionQuantity, positionCost) ->
                            if normalized.Quantity > positionQuantity then
                                transaction.Rollback()

                                BondSellWriteResult.BondSellInsufficientHoldings(
                                    sprintf "cannot sell %O 张: only %O held" normalized.Quantity positionQuantity
                                )
                            else
                                let executedAt = defaultArg executedAtOverride DateTimeOffset.UtcNow

                                let gross =
                                    Decimal.Round(
                                        normalized.Quantity * normalized.Price * normalized.ParValue / 100m,
                                        2,
                                        MidpointRounding.AwayFromZero
                                    )

                                let proceeds = Decimal.Round(gross - normalized.FeeAmount, 2, MidpointRounding.AwayFromZero)

                                if proceeds < 0m then
                                    transaction.Rollback()
                                    BondSellWriteResult.BondSellInvalid "fee exceeds gross proceeds"
                                else
                                    let costReleased =
                                        if normalized.Quantity = positionQuantity then
                                            positionCost
                                        else
                                            Decimal.Round(
                                                positionCost * normalized.Quantity / positionQuantity,
                                                2,
                                                MidpointRounding.AwayFromZero
                                            )

                                    let realizedPnl = Decimal.Round(proceeds - costReleased, 2, MidpointRounding.AwayFromZero)

                                    let record: BondSellRecord =
                                        {
                                            Id = Guid.NewGuid()
                                            FundId = fundId
                                            InstrumentCode = normalized.InstrumentCode
                                            BondName = normalized.BondName
                                            Quantity = normalized.Quantity
                                            Price = normalized.Price
                                            CleanPrice = normalized.CleanPrice
                                            AccruedInterest = normalized.AccruedInterest
                                            ParValue = normalized.ParValue
                                            SettlementDate = normalized.SettlementDate
                                            TradeDate = normalized.TradeDate |> Option.defaultValue normalized.SettlementDate
                                            FeeAmount = normalized.FeeAmount
                                            Proceeds = proceeds
                                            CostReleased = costReleased
                                            RealizedPnl = realizedPnl
                                            IsSynthetic = isSynthetic
                                            ExecutedAt = executedAt
                                        }

                                    insertBondSell connection (Some transaction) record
                                    insertBondSellIdempotency connection (Some transaction) idempotencyKey fingerprint record.Id fundId

                                    use cashCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            "UPDATE funds SET available_cash = available_cash + @proceeds WHERE id = @fund_id"

                                    addParameter cashCommand "proceeds" NpgsqlDbType.Numeric (box proceeds) |> ignore
                                    addParameter cashCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                    cashCommand.ExecuteNonQuery() |> ignore

                                    if normalized.Quantity = positionQuantity then
                                        use removeCommand =
                                            commandWithTransaction
                                                connection
                                                (Some transaction)
                                                "DELETE FROM bond_positions WHERE fund_id = @fund_id AND instrument_code = @code"

                                        addParameter removeCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                        addParameter removeCommand "code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore
                                        removeCommand.ExecuteNonQuery() |> ignore
                                    else
                                        use positionCommand =
                                            commandWithTransaction
                                                connection
                                                (Some transaction)
                                                """
                                                UPDATE bond_positions
                                                SET quantity = quantity - @quantity,
                                                    cost_cash = cost_cash - @cost_released,
                                                    last_traded_at = @last_traded_at
                                                WHERE fund_id = @fund_id AND instrument_code = @code
                                                """

                                        addParameter positionCommand "quantity" NpgsqlDbType.Numeric (box normalized.Quantity) |> ignore
                                        addParameter positionCommand "cost_released" NpgsqlDbType.Numeric (box costReleased) |> ignore
                                        addParameter positionCommand "last_traded_at" NpgsqlDbType.TimestampTz (box executedAt) |> ignore
                                        addParameter positionCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                        addParameter positionCommand "code" NpgsqlDbType.Text (box normalized.InstrumentCode) |> ignore
                                        positionCommand.ExecuteNonQuery() |> ignore

                                    transaction.Commit()
                                    BondSellWriteResult.BondSellCreated record
            with error ->
                try
                    transaction.Rollback()
                with _ ->
                    ()

                raise error

    member _.GetBondSells(fundId: Guid) : BondSellRecord list =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                $"""
                SELECT {bondSellColumns}
                FROM bond_sells
                WHERE fund_id = @fund_id
                ORDER BY executed_at, id
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<BondSellRecord>()

        while reader.Read() do
            records.Add(bondSellRecordFromReader reader)

        records |> Seq.toList

    member _.GetBondPositions(fundId: Guid) : BondPositionRecord list =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT instrument_code, bond_name, quantity, cost_cash, last_traded_at
                FROM bond_positions
                WHERE fund_id = @fund_id
                ORDER BY instrument_code
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<BondPositionRecord>()

        while reader.Read() do
            records.Add(
                {
                    FundId = fundId
                    InstrumentCode = reader.GetString(0)
                    BondName = if reader.IsDBNull(1) then None else Some(reader.GetString(1))
                    Quantity = reader.GetDecimal(2)
                    CostCash = reader.GetDecimal(3)
                    LastTradedAt = reader.GetFieldValue<DateTimeOffset>(4)
                }
            )

        records |> Seq.toList

    member _.GetCapitalDeposits(fundId: Guid) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                "SELECT id, fund_id, amount, note, is_synthetic, created_at FROM fund_capital_deposits WHERE fund_id = @fund_id ORDER BY created_at DESC, id"

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<CapitalDepositRecord>()

        while reader.Read() do
            records.Add(capitalDepositRecordFromReader reader)

        records |> Seq.toList

    member _.CreateRedemptionOrder(idempotencyKey: string, fundId: Guid, command: RedemptionCommand) : RedemptionWriteResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            RedemptionWriteResult.RedemptionInvalid "idempotency key cannot be empty"
        else
            match validateRedemptionCommand command with
            | Error message -> RedemptionWriteResult.RedemptionInvalid message
            | Ok() ->
                let fingerprint = redemptionRequestHash fundId command
                use connection = new NpgsqlConnection(connectionString)
                connection.Open()
                use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

                try
                    use lockCommand =
                        commandWithTransaction
                            connection
                            (Some transaction)
                            "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                    addParameter lockCommand "lock_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                    lockCommand.ExecuteNonQuery() |> ignore

                    match findRedemptionOrderIdempotency connection (Some transaction) idempotencyKey with
                    | Some(existingHash, existingFundId, orderId)
                        when existingHash = fingerprint && existingFundId = fundId ->
                        match findRedemptionOrder connection (Some transaction) orderId with
                        | Some order ->
                            transaction.Commit()
                            RedemptionReplayed order
                        | None ->
                            transaction.Rollback()
                            RedemptionWriteResult.RedemptionInvalid "idempotency record references a missing order"
                    | Some _ ->
                        transaction.Rollback()
                        RedemptionIdempotencyConflict
                    | None ->
                        match lockFundForOrder connection (Some transaction) fundId with
                        | None ->
                            transaction.Rollback()
                            RedemptionFundNotFound
                        | Some isSynthetic ->
                            if instrumentExists connection (Some transaction) command.InstrumentCode then
                                use freezeCommand =
                                    commandWithTransaction
                                        connection
                                        (Some transaction)
                                        """
                                        UPDATE fund_positions
                                        SET reserved_units = reserved_units + @units
                                        WHERE fund_id = @fund_id
                                          AND instrument_code = @code
                                          AND units - reserved_units >= @units
                                        """

                                addParameter freezeCommand "units" NpgsqlDbType.Numeric (box command.Units) |> ignore
                                addParameter freezeCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                addParameter freezeCommand "code" NpgsqlDbType.Text (box command.InstrumentCode) |> ignore

                                if freezeCommand.ExecuteNonQuery() = 0 then
                                    transaction.Rollback()
                                    RedemptionInsufficientUnits
                                else
                                    let submittedAt = DateTimeOffset.UtcNow
                                    let order: RedemptionOrderRecord =
                                        {
                                            Id = Guid.NewGuid()
                                            FundId = fundId
                                            InstrumentCode = command.InstrumentCode
                                            Units = command.Units
                                            FeeAmount = command.FeeAmount
                                            Status = "submitted"
                                            IsSynthetic = isSynthetic
                                            SubmittedAt = submittedAt
                                            TradeDate = ConfirmationPolicy.tradeDateFor submittedAt
                                            ConfirmIdempotencyKey = None
                                            PendingReason = None
                                            ConfirmedAt = None
                                            ConfirmedNav = None
                                            ConfirmedNavDate = None
                                            ConfirmedProceeds = None
                                            ConfirmedCostReleased = None
                                        }

                                    let submittedAt = insertRedemptionOrder connection (Some transaction) order
                                    insertRedemptionOrderIdempotency connection (Some transaction) idempotencyKey fingerprint order.Id fundId
                                    transaction.Commit()
                                    RedemptionCreated { order with SubmittedAt = submittedAt }
                            else
                                transaction.Rollback()
                                RedemptionInstrumentNotFound
                with error ->
                    try
                        transaction.Rollback()
                    with _ ->
                        ()

                    raise error

    member _.GetRedemptionOrders(fundId: Guid) =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction connection None (redemptionOrderColumns + " WHERE fund_id = @fund_id ORDER BY submitted_at DESC, id")

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<RedemptionOrderRecord>()

        while reader.Read() do
            records.Add(redemptionRecordFromReader reader)

        records |> Seq.toList

    member _.ConfirmRedemptionOrder(idempotencyKey: string, fundId: Guid, orderId: Guid) : RedemptionConfirmResult =
        if String.IsNullOrWhiteSpace idempotencyKey then
            RedemptionConfirmResult.RedemptionInvalid "idempotency key cannot be empty"
        else
            use connection = new NpgsqlConnection(connectionString)
            connection.Open()
            use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

            try
                let confirmedAt = DateTimeOffset.UtcNow
                let today = ConfirmationPolicy.shanghaiDate confirmedAt

                use lockCommand =
                    commandWithTransaction
                        connection
                        (Some transaction)
                        "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                addParameter lockCommand "lock_key" NpgsqlDbType.Text (box (sprintf "confirm-redemption:%O" orderId)) |> ignore
                lockCommand.ExecuteNonQuery() |> ignore

                match findRedemptionOrder connection (Some transaction) orderId with
                | None ->
                    transaction.Rollback()
                    RedemptionOrderNotFound
                | Some order when order.FundId <> fundId ->
                    transaction.Rollback()
                    RedemptionOrderNotFound
                | Some order ->
                    if order.Status = "confirmed" then
                        match order.ConfirmIdempotencyKey with
                        | Some storedKey when storedKey = idempotencyKey ->
                            transaction.Commit()
                            RedemptionConfirmReplayed order
                        | _ ->
                            match findRedemptionConfirmIdempotency connection (Some transaction) idempotencyKey with
                            | Some(_, _, storedOrderId) when storedOrderId = orderId ->
                                transaction.Commit()
                                RedemptionConfirmReplayed order
                            | Some _ ->
                                transaction.Rollback()
                                RedemptionConfirmIdempotencyConflict
                            | None ->
                                transaction.Rollback()
                                RedemptionAlreadyConfirmed
                    elif order.Status <> "submitted" && order.Status <> "pending_nav" then
                        transaction.Rollback()
                        RedemptionInvalidStatus
                    else
                        match findRedemptionConfirmIdempotency connection (Some transaction) idempotencyKey with
                        | Some _ ->
                            transaction.Rollback()
                            RedemptionConfirmIdempotencyConflict
                        | None ->
                            let tradeDate = order.TradeDate
                            let tradeDateText = tradeDate.ToString("yyyy-MM-dd")

                            use quoteCommand =
                                commandWithTransaction
                                    connection
                                    (Some transaction)
                                    """
                                    SELECT o.nav, o.nav_date, o.source, o.source_revision, o.source_collected_at, o.published_at,
                                           o.source_payload_hash, o.first_seen_at, e.first_seen_at
                                    FROM fund_nav_observations o
                                    LEFT JOIN fund_nav_observation_evidence e
                                        ON e.instrument_code = o.instrument_code
                                       AND e.nav_date = o.nav_date
                                       AND e.source_payload_hash = o.source_payload_hash
                                    WHERE o.instrument_code = @code AND o.nav_date = @trade_date AND o.nav > 0
                                    ORDER BY o.source_collected_at DESC, o.published_at DESC NULLS LAST, o.source_revision DESC
                                    LIMIT 1
                                    """

                            addParameter quoteCommand "code" NpgsqlDbType.Text (box order.InstrumentCode) |> ignore
                            addParameter quoteCommand "trade_date" NpgsqlDbType.Date (box tradeDate) |> ignore

                            use quoteReader = quoteCommand.ExecuteReader()
                            let quoteFound = quoteReader.Read()

                            let selectedQuote =
                                if quoteFound then
                                    let evidenceFirstSeen =
                                        if quoteReader.IsDBNull(8) then
                                            None
                                        else
                                            Some(quoteReader.GetFieldValue<DateTimeOffset>(8))

                                    Some
                                        ({
                                            Nav = quoteReader.GetDecimal(0)
                                            NavDate = quoteReader.GetFieldValue<DateOnly>(1)
                                            Source = quoteReader.GetString(2)
                                            Revision = quoteReader.GetString(3)
                                            CollectedAt = quoteReader.GetFieldValue<DateTimeOffset>(4)
                                            PublishedAt =
                                                if quoteReader.IsDBNull(5) then
                                                    None
                                                else
                                                    Some(quoteReader.GetFieldValue<DateTimeOffset>(5))
                                            PayloadHash = quoteReader.GetString(6)
                                            FirstSeenAt = quoteReader.GetFieldValue<DateTimeOffset>(7)
                                         },
                                         evidenceFirstSeen)
                                else
                                    None

                            quoteReader.Close()

                            let boundQuote =
                                match selectedQuote with
                                | Some(quote, Some firstSeen) -> Some { quote with FirstSeenAt = firstSeen }
                                | _ -> None

                            let deferralReason =
                                match selectedQuote with
                                | None ->
                                    Some(sprintf "nav for trade date %s is not available yet" tradeDateText)
                                | Some(_, evidenceFirstSeen) when evidenceFirstSeen.IsNone ->
                                    Some(sprintf "nav revision for trade date %s has no observation evidence recorded" tradeDateText)
                                | Some(quote, _) when quote.FirstSeenAt > confirmedAt ->
                                    Some(sprintf "nav revision for trade date %s was first observed after the confirmation attempt" tradeDateText)
                                | Some(quote, _) ->
                                    ConfirmationPolicy.navDeferralReason
                                        {
                                            Nav = quote.Nav
                                            NavDate = quote.NavDate
                                            CollectedAt = quote.CollectedAt
                                            PublishedAt = quote.PublishedAt
                                        }
                                        tradeDate
                                        today
                                        confirmedAt

                            match deferralReason with
                            | Some reason ->
                                use pendingCommand =
                                    commandWithTransaction
                                        connection
                                        (Some transaction)
                                        """
                                        UPDATE redemption_orders
                                        SET status = 'pending_nav',
                                            pending_reason = @reason,
                                            confirm_idempotency_key = NULL,
                                            confirmed_at = NULL,
                                            confirmed_nav = NULL,
                                            confirmed_nav_date = NULL,
                                            confirmed_proceeds = NULL,
                                            confirmed_cost_released = NULL
                                        WHERE id = @order_id
                                        """

                                addParameter pendingCommand "reason" NpgsqlDbType.Text (box reason) |> ignore
                                addParameter pendingCommand "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
                                pendingCommand.ExecuteNonQuery() |> ignore
                                transaction.Commit()

                                match findRedemptionOrder connection None orderId with
                                | Some pendingOrder -> RedemptionPendingNav pendingOrder
                                | None -> failwith "pending redemption disappeared after confirmation deferral"
                            | None ->
                                let nav = boundQuote |> Option.get |> fun quote -> quote.Nav

                                use positionCommand =
                                    commandWithTransaction
                                        connection
                                        (Some transaction)
                                        """
                                        SELECT units, reserved_units, cost_cash
                                        FROM fund_positions
                                        WHERE fund_id = @fund_id AND instrument_code = @code
                                        FOR UPDATE
                                        """

                                addParameter positionCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                addParameter positionCommand "code" NpgsqlDbType.Text (box order.InstrumentCode) |> ignore

                                use positionReader = positionCommand.ExecuteReader()
                                let positionFound = positionReader.Read()
                                let positionUnits = if positionFound then positionReader.GetDecimal(0) else 0m
                                let positionReserved = if positionFound then positionReader.GetDecimal(1) else 0m
                                let positionCost = if positionFound then positionReader.GetDecimal(2) else 0m
                                positionReader.Close()

                                if not positionFound || positionReserved < order.Units then
                                    failwith "frozen units are missing for redemption confirmation"

                                match RedemptionPolicy.compute order.Units nav order.FeeAmount positionCost positionUnits with
                                | Error message ->
                                    use pendingCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            UPDATE redemption_orders
                                            SET status = 'pending_nav',
                                                pending_reason = @reason
                                            WHERE id = @order_id
                                            """

                                    addParameter pendingCommand "reason" NpgsqlDbType.Text (box message) |> ignore
                                    addParameter pendingCommand "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
                                    pendingCommand.ExecuteNonQuery() |> ignore
                                    transaction.Commit()

                                    match findRedemptionOrder connection None orderId with
                                    | Some pendingOrder -> RedemptionPendingNav pendingOrder
                                    | None -> failwith "pending redemption disappeared after computation failure"
                                | Ok computation ->
                                    use settlePositionCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            UPDATE fund_positions
                                            SET units = units - @units,
                                                reserved_units = reserved_units - @units,
                                                cost_cash = cost_cash - @cost_released
                                            WHERE fund_id = @fund_id
                                              AND instrument_code = @code
                                              AND units > @units
                                              AND reserved_units >= @units
                                              AND cost_cash >= @cost_released
                                            """

                                    addParameter settlePositionCommand "units" NpgsqlDbType.Numeric (box order.Units) |> ignore
                                    addParameter settlePositionCommand "cost_released" NpgsqlDbType.Numeric (box computation.RedeemedCost) |> ignore
                                    addParameter settlePositionCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                    addParameter settlePositionCommand "code" NpgsqlDbType.Text (box order.InstrumentCode) |> ignore

                                    if settlePositionCommand.ExecuteNonQuery() = 0 then
                                        use deletePositionCommand =
                                            commandWithTransaction
                                                connection
                                                (Some transaction)
                                                """
                                                DELETE FROM fund_positions
                                                WHERE fund_id = @fund_id
                                                  AND instrument_code = @code
                                                  AND units = @units
                                                  AND reserved_units >= @units
                                                  AND cost_cash >= @cost_released
                                                """

                                        addParameter deletePositionCommand "units" NpgsqlDbType.Numeric (box order.Units) |> ignore
                                        addParameter deletePositionCommand "cost_released" NpgsqlDbType.Numeric (box computation.RedeemedCost) |> ignore
                                        addParameter deletePositionCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                        addParameter deletePositionCommand "code" NpgsqlDbType.Text (box order.InstrumentCode) |> ignore

                                        if deletePositionCommand.ExecuteNonQuery() = 0 then
                                            failwith "position units changed during redemption confirmation"

                                    use cashCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            UPDATE funds
                                            SET available_cash = available_cash + @proceeds
                                            WHERE id = @fund_id
                                            """

                                    addParameter cashCommand "proceeds" NpgsqlDbType.Numeric (box computation.Proceeds) |> ignore
                                    addParameter cashCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

                                    if cashCommand.ExecuteNonQuery() = 0 then
                                        failwith "fund disappeared during redemption confirmation"

                                    use confirmCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            UPDATE redemption_orders
                                            SET status = 'confirmed',
                                                pending_reason = NULL,
                                                confirm_idempotency_key = @idempotency_key,
                                                confirmed_at = @confirmed_at,
                                                confirmed_nav = @nav,
                                                confirmed_nav_date = @nav_date,
                                                confirmed_proceeds = @proceeds,
                                                confirmed_cost_released = @cost_released
                                            WHERE id = @order_id
                                            """

                                    addParameter confirmCommand "idempotency_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                                    addParameter confirmCommand "confirmed_at" NpgsqlDbType.TimestampTz (box confirmedAt) |> ignore
                                    addParameter confirmCommand "nav" NpgsqlDbType.Numeric (box nav) |> ignore
                                    addParameter confirmCommand "nav_date" NpgsqlDbType.Date (box tradeDate) |> ignore
                                    addParameter confirmCommand "proceeds" NpgsqlDbType.Numeric (box computation.Proceeds) |> ignore
                                    addParameter confirmCommand "cost_released" NpgsqlDbType.Numeric (box computation.RedeemedCost) |> ignore
                                    addParameter confirmCommand "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
                                    confirmCommand.ExecuteNonQuery() |> ignore

                                    insertRedemptionConfirmIdempotency connection (Some transaction) idempotencyKey "" orderId fundId
                                    transaction.Commit()

                                    match findRedemptionOrder connection None orderId with
                                    | Some confirmedOrder -> RedemptionConfirmed confirmedOrder
                                    | None -> failwith "confirmed redemption disappeared after commit"

            with error ->
                try
                    transaction.Rollback()
                with _ ->
                    ()

                raise error

    member _.ConfirmSubscriptionOrder(idempotencyKey: string, fundId: Guid, orderId: Guid) =
        if String.IsNullOrWhiteSpace idempotencyKey then
            ConfirmInvalid "idempotency key cannot be empty"
        else
            use connection = new NpgsqlConnection(connectionString)
            connection.Open()
            use transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

            try
                let confirmedAt = DateTimeOffset.UtcNow
                let today = ConfirmationPolicy.shanghaiDate confirmedAt

                let requestHash =
                    Convert
                        .ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(sprintf "confirm:%O:%O" fundId orderId)))
                        .ToLowerInvariant()

                use lockCommand =
                    commandWithTransaction
                        connection
                        (Some transaction)
                        "SELECT pg_advisory_xact_lock(hashtext(@lock_key))"

                addParameter lockCommand "lock_key" NpgsqlDbType.Text (box (sprintf "confirm-order:%O" orderId)) |> ignore
                lockCommand.ExecuteNonQuery() |> ignore

                match findOrder connection (Some transaction) orderId with
                | None ->
                    transaction.Rollback()
                    ConfirmOrderNotFound
                | Some order when order.FundId <> fundId ->
                    transaction.Rollback()
                    ConfirmOrderNotFound
                | Some order ->
                    if order.Status = "confirmed" then
                        match order.ConfirmIdempotencyKey with
                        | Some storedKey when storedKey = idempotencyKey ->
                            transaction.Commit()
                            ConfirmReplayed order
                        | _ ->
                            match findConfirmIdempotency connection (Some transaction) idempotencyKey with
                            | Some(_, _, storedOrderId) when storedOrderId = orderId ->
                                transaction.Commit()
                                ConfirmReplayed order
                            | Some _ ->
                                transaction.Rollback()
                                ConfirmIdempotencyConflict
                            | None ->
                                transaction.Rollback()
                                ConfirmAlreadyConfirmed
                    elif order.Status <> "submitted" && order.Status <> "pending_nav" then
                        transaction.Rollback()
                        ConfirmInvalidStatus
                    else
                        match findConfirmIdempotency connection (Some transaction) idempotencyKey with
                        | Some _ ->
                            transaction.Rollback()
                            ConfirmIdempotencyConflict
                        | None ->
                            let tradeDate = order.TradeDate
                            let tradeDateText = tradeDate.ToString("yyyy-MM-dd")

                            use quoteCommand =
                                commandWithTransaction
                                    connection
                                    (Some transaction)
                                    """
                                    SELECT o.nav, o.nav_date, o.source, o.source_revision, o.source_collected_at, o.published_at,
                                           o.source_payload_hash, o.first_seen_at, e.first_seen_at
                                    FROM fund_nav_observations o
                                    LEFT JOIN fund_nav_observation_evidence e
                                        ON e.instrument_code = o.instrument_code
                                       AND e.nav_date = o.nav_date
                                       AND e.source_payload_hash = o.source_payload_hash
                                    WHERE o.instrument_code = @code AND o.nav_date = @trade_date AND o.nav > 0
                                    ORDER BY o.source_collected_at DESC, o.published_at DESC NULLS LAST, o.source_revision DESC
                                    LIMIT 1
                                    """

                            addParameter quoteCommand "code" NpgsqlDbType.Text (box order.FundCode) |> ignore
                            addParameter quoteCommand "trade_date" NpgsqlDbType.Date (box tradeDate) |> ignore

                            use quoteReader = quoteCommand.ExecuteReader()
                            let quoteFound = quoteReader.Read()

                            let selectedQuote, evidenceFirstSeen =
                                if quoteFound then
                                    let evidenceFirstSeen =
                                        if quoteReader.IsDBNull(8) then
                                            None
                                        else
                                            Some(quoteReader.GetFieldValue<DateTimeOffset>(8))

                                    Some
                                        {
                                            Nav = quoteReader.GetDecimal(0)
                                            NavDate = quoteReader.GetFieldValue<DateOnly>(1)
                                            Source = quoteReader.GetString(2)
                                            Revision = quoteReader.GetString(3)
                                            CollectedAt = quoteReader.GetFieldValue<DateTimeOffset>(4)
                                            PublishedAt =
                                                if quoteReader.IsDBNull(5) then
                                                    None
                                                else
                                                    Some(quoteReader.GetFieldValue<DateTimeOffset>(5))
                                            PayloadHash = quoteReader.GetString(6)
                                            FirstSeenAt = quoteReader.GetFieldValue<DateTimeOffset>(7)
                                        },
                                    evidenceFirstSeen
                                else
                                    None, None

                            quoteReader.Close()

                            let boundQuote =
                                match selectedQuote, evidenceFirstSeen with
                                | Some quote, Some firstSeen -> Some { quote with FirstSeenAt = firstSeen }
                                | _ -> None

                            let deferralReason =
                                if selectedQuote.IsSome && evidenceFirstSeen.IsNone then
                                    Some(
                                        sprintf
                                            "nav revision for trade date %s has no observation evidence recorded"
                                            tradeDateText
                                    )
                                else
                                    match boundQuote with
                                    | None -> Some(sprintf "nav for trade date %s is not available yet" tradeDateText)
                                    | Some quote when quote.FirstSeenAt > confirmedAt ->
                                        Some(
                                            sprintf
                                                "nav revision for trade date %s was first observed after the confirmation attempt"
                                                tradeDateText
                                        )
                                    | Some quote ->
                                        ConfirmationPolicy.navDeferralReason
                                            {
                                                Nav = quote.Nav
                                                NavDate = quote.NavDate
                                                CollectedAt = quote.CollectedAt
                                                PublishedAt = quote.PublishedAt
                                            }
                                            tradeDate
                                            today
                                            confirmedAt

                            let markPending reason =
                                use pendingCommand =
                                    commandWithTransaction
                                        connection
                                        (Some transaction)
                                        """
                                        UPDATE subscription_orders
                                        SET status = 'pending_nav',
                                            pending_reason = @reason,
                                            confirm_idempotency_key = NULL,
                                            confirmed_at = NULL,
                                            confirmed_nav = NULL,
                                            confirmed_nav_date = NULL,
                                            confirmed_nav_source = NULL,
                                            confirmed_nav_revision = NULL,
                                            confirmed_nav_collected_at = NULL,
                                            confirmed_nav_published_at = NULL,
                                            confirmed_nav_payload_hash = NULL,
                                            confirmed_nav_first_seen_at = NULL,
                                            confirmed_units = NULL,
                                            confirmed_invested_cash = NULL,
                                            confirmed_residual_cash = NULL
                                        WHERE id = @order_id
                                        """

                                addParameter pendingCommand "reason" NpgsqlDbType.Text (box reason) |> ignore
                                addParameter pendingCommand "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
                                pendingCommand.ExecuteNonQuery() |> ignore

                            let readPendingAfterCommit () =
                                match findOrder connection None orderId with
                                | Some pendingOrder -> ConfirmPendingNav pendingOrder
                                | None -> failwith "pending order disappeared after confirmation deferral"

                            match deferralReason with
                            | Some reason ->
                                markPending reason
                                transaction.Commit()
                                readPendingAfterCommit ()
                            | None ->
                                let quote = boundQuote |> Option.get
                                let source = quote.Source
                                let revision = quote.Revision

                                match ConfirmationPolicy.compute order.Amount quote.Nav with
                                | Error message ->
                                    markPending message
                                    transaction.Commit()
                                    readPendingAfterCommit ()
                                | Ok computation ->
                                    use cashCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            UPDATE funds
                                            SET available_cash = available_cash + @residual,
                                                reserved_cash = reserved_cash - @reserved_total
                                            WHERE id = @fund_id AND reserved_cash >= @reserved_total
                                            """

                                    addParameter cashCommand "residual" NpgsqlDbType.Numeric (box computation.ResidualCash) |> ignore
                                    addParameter cashCommand "reserved_total" NpgsqlDbType.Numeric (box order.ReservedTotal) |> ignore
                                    addParameter cashCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

                                    if cashCommand.ExecuteNonQuery() = 0 then
                                        failwith "insufficient reserved cash for order confirmation"

                                    let publishedParameter =
                                        match quote.PublishedAt with
                                        | Some published -> box published
                                        | None -> box DBNull.Value

                                    use confirmCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            UPDATE subscription_orders
                                            SET status = 'confirmed',
                                                pending_reason = NULL,
                                                confirm_idempotency_key = @idempotency_key,
                                                confirmed_at = @confirmed_at,
                                                confirmed_nav = @nav,
                                                confirmed_nav_date = @nav_date,
                                                confirmed_nav_source = @source,
                                                confirmed_nav_revision = @revision,
                                                confirmed_nav_collected_at = @collected_at,
                                                confirmed_nav_published_at = @published_at,
                                                confirmed_nav_payload_hash = @payload_hash,
                                                confirmed_nav_first_seen_at = @first_seen_at,
                                                confirmed_units = @units,
                                                confirmed_invested_cash = @invested,
                                                confirmed_residual_cash = @residual
                                            WHERE id = @order_id
                                            """

                                    addParameter confirmCommand "idempotency_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                                    addParameter confirmCommand "confirmed_at" NpgsqlDbType.TimestampTz (box confirmedAt) |> ignore
                                    addParameter confirmCommand "nav" NpgsqlDbType.Numeric (box quote.Nav) |> ignore
                                    addParameter confirmCommand "nav_date" NpgsqlDbType.Date (box quote.NavDate) |> ignore
                                    addParameter confirmCommand "source" NpgsqlDbType.Text (box source) |> ignore
                                    addParameter confirmCommand "revision" NpgsqlDbType.Text (box revision) |> ignore
                                    addParameter confirmCommand "collected_at" NpgsqlDbType.TimestampTz (box quote.CollectedAt) |> ignore
                                    addParameter confirmCommand "published_at" NpgsqlDbType.TimestampTz publishedParameter |> ignore
                                    addParameter confirmCommand "payload_hash" NpgsqlDbType.Text (box quote.PayloadHash) |> ignore
                                    addParameter confirmCommand "first_seen_at" NpgsqlDbType.TimestampTz (box quote.FirstSeenAt) |> ignore
                                    addParameter confirmCommand "units" NpgsqlDbType.Numeric (box computation.Units) |> ignore
                                    addParameter confirmCommand "invested" NpgsqlDbType.Numeric (box computation.InvestedCash) |> ignore
                                    addParameter confirmCommand "residual" NpgsqlDbType.Numeric (box computation.ResidualCash) |> ignore
                                    addParameter confirmCommand "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
                                    confirmCommand.ExecuteNonQuery() |> ignore

                                    use positionCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            INSERT INTO fund_positions
                                                (fund_id, instrument_code, units, cost_cash, first_confirmed_at, last_confirmed_at)
                                            VALUES
                                                (@fund_id, @code, @units, @invested, @confirmed_at, @confirmed_at)
                                            ON CONFLICT (fund_id, instrument_code) DO UPDATE
                                            SET units = fund_positions.units + EXCLUDED.units,
                                                cost_cash = fund_positions.cost_cash + EXCLUDED.cost_cash,
                                                last_confirmed_at = EXCLUDED.last_confirmed_at
                                            """

                                    addParameter positionCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                    addParameter positionCommand "code" NpgsqlDbType.Text (box order.FundCode) |> ignore
                                    addParameter positionCommand "units" NpgsqlDbType.Numeric (box computation.Units) |> ignore
                                    addParameter positionCommand "invested" NpgsqlDbType.Numeric (box computation.InvestedCash) |> ignore
                                    addParameter positionCommand "confirmed_at" NpgsqlDbType.TimestampTz (box confirmedAt) |> ignore
                                    positionCommand.ExecuteNonQuery() |> ignore

                                    let publishedJson =
                                        match quote.PublishedAt with
                                        | Some published -> sprintf "\"%O\"" published
                                        | None -> "null"

                                    let detail =
                                        sprintf
                                            "{\"fund_id\":\"%O\",\"order_id\":\"%O\",\"units\":\"%M\",\"invested_cash\":\"%M\",\"residual_cash\":\"%M\",\"quote\":{\"nav_date\":\"%s\",\"nav\":\"%M\",\"source\":%s,\"source_revision\":%s,\"source_collected_at\":\"%O\",\"published_at\":%s,\"source_payload_hash\":%s,\"first_seen_at\":\"%O\"}}"
                                            fundId
                                            orderId
                                            computation.Units
                                            computation.InvestedCash
                                            computation.ResidualCash
                                            (quote.NavDate.ToString("yyyy-MM-dd"))
                                            quote.Nav
                                            (JsonSerializer.Serialize source)
                                            (JsonSerializer.Serialize revision)
                                            quote.CollectedAt
                                            publishedJson
                                            (JsonSerializer.Serialize quote.PayloadHash)
                                            quote.FirstSeenAt

                                    use eventCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            INSERT INTO subscription_order_events (order_id, event_type, detail)
                                            VALUES (@order_id, 'confirmed', @detail)
                                            """

                                    addParameter eventCommand "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
                                    addParameter eventCommand "detail" NpgsqlDbType.Jsonb (box detail) |> ignore
                                    eventCommand.ExecuteNonQuery() |> ignore

                                    use idempotencyCommand =
                                        commandWithTransaction
                                            connection
                                            (Some transaction)
                                            """
                                            INSERT INTO subscription_confirm_idempotencies
                                                (idempotency_key, request_hash, order_id, fund_id)
                                            VALUES
                                                (@idempotency_key, @request_hash, @order_id, @fund_id)
                                            """

                                    addParameter idempotencyCommand "idempotency_key" NpgsqlDbType.Text (box idempotencyKey) |> ignore
                                    addParameter idempotencyCommand "request_hash" NpgsqlDbType.Text (box requestHash) |> ignore
                                    addParameter idempotencyCommand "order_id" NpgsqlDbType.Uuid (box orderId) |> ignore
                                    addParameter idempotencyCommand "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore
                                    idempotencyCommand.ExecuteNonQuery() |> ignore

                                    transaction.Commit()

                                    match findOrder connection None orderId with
                                    | Some confirmedOrder -> OrderConfirmed confirmedOrder
                                    | None -> failwith "confirmed order disappeared after commit"
            with error ->
                try
                    transaction.Rollback()
                with _ ->
                    ()

                raise error

    member _.GetFundPositions(fundId: Guid) : FundPositionRecord list =
        use connection = new NpgsqlConnection(connectionString)
        connection.Open()

        use command =
            commandWithTransaction
                connection
                None
                """
                SELECT p.instrument_code, p.units, p.reserved_units, p.cost_cash, p.last_confirmed_at,
                       q.nav, q.nav_date, q.source_collected_at
                FROM fund_positions p
                LEFT JOIN LATERAL (
                    SELECT nav, nav_date, source_collected_at
                    FROM fund_nav_observations
                    WHERE instrument_code = p.instrument_code
                      AND nav_date <= (now() AT TIME ZONE 'Asia/Shanghai')::date
                      AND nav > 0
                      AND source_collected_at <= now()
                      AND (published_at IS NULL OR published_at <= now())
                    ORDER BY nav_date DESC, source_collected_at DESC
                    LIMIT 1
                ) q ON true
                WHERE p.fund_id = @fund_id
                ORDER BY p.instrument_code
                """

        addParameter command "fund_id" NpgsqlDbType.Uuid (box fundId) |> ignore

        use reader = command.ExecuteReader()
        let records = ResizeArray<FundPositionRecord>()

        while reader.Read() do
            let valuationNav =
                if reader.IsDBNull(5) then None else Some(reader.GetDecimal(5))

            let valuationNavDate =
                if reader.IsDBNull(6) then None else Some(reader.GetFieldValue<DateOnly>(6))

            let valuationCollectedAt =
                if reader.IsDBNull(7) then None else Some(reader.GetFieldValue<DateTimeOffset>(7))

            records.Add(
                {
                    FundId = fundId
                    InstrumentCode = reader.GetString(0)
                    Units = reader.GetDecimal(1)
                    ReservedUnits = reader.GetDecimal(2)
                    CostCash = reader.GetDecimal(3)
                    LastConfirmedAt = reader.GetFieldValue<DateTimeOffset>(4)
                    ValuationNav = valuationNav
                    ValuationNavDate = valuationNavDate
                    ValuationCollectedAt = valuationCollectedAt
                }
            )

        records |> Seq.toList

    /// Reconstructs the fund's asset and unit-NAV history from confirmed ledger
    /// events plus persisted NAV observations. Unit NAV is rebuilt by issuing fund
    /// units for external capital deposits at the previously known unit NAV, so a
    /// deposit never moves the unit NAV. Values that cannot be known at a date stay
    /// `None`; nothing is filled with zero.
    member this.GetFundReturns(fundId: Guid) : FundReturns option =
        match this.GetFund fundId with
        | None -> None
        | Some fund ->
            let today = ConfirmationPolicy.eventDateFor DateTimeOffset.UtcNow
            let deposits = this.GetCapitalDeposits fundId
            let orders = this.GetSubscriptionOrders fundId
            let redemptions = this.GetRedemptionOrders fundId
            let dividends = this.GetDividendRecords fundId

            let heldCodes =
                [ yield! orders |> List.map (fun order -> order.FundCode)
                  yield! redemptions |> List.map (fun order -> order.InstrumentCode) ]
                |> List.distinct

            let navByCode =
                heldCodes
                |> List.map (fun code -> code, this.GetNav(code, None, Some today))
                |> Map.ofList

            let firstHoldingDate (code: string) =
                orders
                |> List.filter (fun order -> order.FundCode = code && order.Status = "confirmed")
                |> List.map (fun order -> order.TradeDate)
                |> List.sort
                |> List.tryHead

            let navDates =
                heldCodes
                |> List.collect (fun code ->
                    match firstHoldingDate code with
                    | None -> []
                    | Some startDate ->
                        navByCode.[code]
                        |> List.filter (fun observation ->
                            observation.NavDate >= startDate && observation.NavDate <= today)
                        |> List.map (fun observation -> observation.NavDate))
                |> Set.ofList

            let creationDate = ConfirmationPolicy.eventDateFor fund.CreatedAt

            let dividendCredited =
                dividends
                |> List.filter (fun record -> record.Status = "cash_credited" || record.Status = "succeeded")

            let hasActivity =
                not (List.isEmpty deposits)
                || not (List.isEmpty orders)
                || not (List.isEmpty redemptions)
                || not (List.isEmpty dividendCredited)
                || not (Set.isEmpty navDates)

            if not hasActivity then
                Some
                    {
                        FundId = fundId
                        Pending = false
                        DataUpdatedAt = None
                        Points = []
                    }
            else
                let eventDates =
                    [ yield creationDate
                      yield! deposits |> List.map (fun deposit -> ConfirmationPolicy.eventDateFor deposit.CreatedAt)
                      yield! orders |> List.map (fun order -> order.TradeDate)
                      yield! redemptions |> List.map (fun order -> order.TradeDate)
                      yield! dividendCredited |> List.map (fun record -> record.NavDate) ]
                    |> Set.ofList

                let dates =
                    Set.union eventDates navDates
                    |> Set.toList
                    |> List.sort

                let dataUpdatedAt =
                    navByCode
                    |> Map.toList
                    |> List.collect snd
                    |> List.map (fun observation -> observation.LastSeenAt)
                    |> List.sortDescending
                    |> List.tryHead

                let latestNavOnOrBefore (code: string) (date: DateOnly) =
                    match Map.tryFind code navByCode with
                    | None -> None
                    | Some observations ->
                        observations
                        |> List.filter (fun observation -> observation.NavDate <= date && observation.Nav > 0m)
                        |> List.sortByDescending (fun observation -> observation.NavDate, observation.SourceCollectedAt)
                        |> List.tryHead

                let mutable availableCash = fund.InitialCash
                let mutable reservedCash = 0m
                let mutable fundUnits = if fund.InitialUnitNav > 0m then fund.InitialCash / fund.InitialUnitNav else 0m
                let mutable lastKnownNav = if fund.InitialUnitNav > 0m then Some fund.InitialUnitNav else None
                let positions = System.Collections.Generic.Dictionary<string, decimal>()
                let mutable cumulativeDeposits = 0m
                let points = ResizeArray<FundReturnsPoint>()

                for date in dates do
                    for deposit in deposits do
                        if ConfirmationPolicy.eventDateFor deposit.CreatedAt = date then
                            availableCash <- availableCash + deposit.Amount
                            cumulativeDeposits <- cumulativeDeposits + deposit.Amount

                            match lastKnownNav with
                            | Some nav when nav > 0m -> fundUnits <- fundUnits + deposit.Amount / nav
                            | _ -> ()

                    for order in orders do
                        if order.TradeDate = date then
                            if order.Status = "confirmed" then
                                let residual = order.ConfirmedResidualCash |> Option.defaultValue 0m
                                availableCash <- availableCash + residual - order.ReservedTotal

                                let units = order.ConfirmedUnits |> Option.defaultValue 0m
                                let current =
                                    match positions.TryGetValue order.FundCode with
                                    | true, value -> value
                                    | _ -> 0m

                                positions.[order.FundCode] <- current + units
                            else
                                availableCash <- availableCash - order.ReservedTotal
                                reservedCash <- reservedCash + order.ReservedTotal

                    for order in redemptions do
                        if order.TradeDate = date && order.Status = "confirmed" then
                            let current =
                                match positions.TryGetValue order.InstrumentCode with
                                | true, value -> value
                                | _ -> 0m

                            positions.[order.InstrumentCode] <- current - order.Units
                            availableCash <- availableCash + (order.ConfirmedProceeds |> Option.defaultValue 0m)

                    for record in dividendCredited do
                        if record.NavDate = date then
                            availableCash <- availableCash + (record.GrossCash |> Option.defaultValue 0m)

                    let mutable pending = false
                    let mutable holdingsValue = 0m

                    for KeyValue(code, units) in positions do
                        if units > 0m then
                            match latestNavOnOrBefore code date with
                            | Some observation -> holdingsValue <- holdingsValue + units * observation.Nav
                            | None -> pending <- true

                    let netExternalFlow = fund.InitialCash + cumulativeDeposits

                    if pending then
                        points.Add(
                            {
                                Date = date
                                Pending = true
                                TotalAssets = None
                                UnitNav = None
                                Cash = availableCash
                                ReservedCash = reservedCash
                                HoldingsValue = None
                                CumulativeReturn = None
                                NetExternalFlow = netExternalFlow
                            }
                        )
                    else
                        let totalAssets = availableCash + reservedCash + holdingsValue
                        let unitNav = if fundUnits > 0m then Some(totalAssets / fundUnits) else None

                        match unitNav with
                        | Some nav -> lastKnownNav <- Some nav
                        | None -> ()

                        points.Add(
                            {
                                Date = date
                                Pending = false
                                TotalAssets = Some totalAssets
                                UnitNav = unitNav
                                Cash = availableCash
                                ReservedCash = reservedCash
                                HoldingsValue = Some holdingsValue
                                CumulativeReturn = Some(totalAssets - netExternalFlow)
                                NetExternalFlow = netExternalFlow
                            }
                        )

                Some
                    {
                        FundId = fundId
                        Pending = points |> Seq.exists (fun point -> point.Pending)
                        DataUpdatedAt = dataUpdatedAt
                        Points = points |> Seq.toList
                    }