fix(money): нормализовать date-only даты документов к UTC (Npgsql timestamptz)

UI (DateField) шлёт openingDate/date как "YYYY-MM-DD" → DateTime Kind=Unspecified
→ Npgsql не пишет в timestamp with time zone → 500 при создании счёта/платежа/
корректировки. MoneyMath.AsUtc нормализует (Unspecified→UTC as-is дата,
Local→ToUniversalTime, Utc→без изменений); применено в MoneyAccounts/
MoneyTransactions/CounterpartyAdjustments на всех сайтах записи даты.

Интеграционные тесты раньше слали DateTime.UtcNow (Kind=Utc) и баг не ловили —
добавлен Account_create_accepts_date_only_opening_date_from_ui (строго
"2026-10-07"). Money integration 8/8 ✓, unit 25/25 ✓.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/food-market.api/Controllers/Money/CounterpartyAdjustmentsController.cs

@@ -2,6 +2,7 @@
 using foodmarket.Api.Infrastructure.Authorization;
 using foodmarket.Application.Common;
 using foodmarket.Application.Common.Tenancy;
+using foodmarket.Application.Money;
 using foodmarket.Domain.Money;
 using foodmarket.Infrastructure.Money;
 using foodmarket.Infrastructure.Persistence;
@@ -71,7 +72,7 @@ public async Task<ActionResult<AdjustmentRow>> Create([FromBody] AdjustmentInput
         {
             OrganizationId = orgId,
             Number = await MoneyNumbering.NextAdjustmentNumberAsync(_db, orgId, input.Date.Year, ct),
-            Date = input.Date,
+            Date = MoneyMath.AsUtc(input.Date),
             CounterpartyId = input.CounterpartyId,
             Direction = input.Direction,
             Amount = input.Amount,
@@ -99,7 +100,7 @@ public async Task<ActionResult<AdjustmentRow>> Update(Guid id, [FromBody] Adjust
             return Conflict(new { code = "already-posted", message = "Проведённую корректировку редактировать нельзя." });
         if (input.Xmin is not null && input.Xmin.Value != 0)
             _db.Entry(a).Property("xmin").OriginalValue = input.Xmin.Value;
-        a.Date = input.Date;
+        a.Date = MoneyMath.AsUtc(input.Date);
         a.CounterpartyId = input.CounterpartyId;
         a.Direction = input.Direction;
         a.Amount = input.Amount;

src/food-market.api/Controllers/Money/MoneyAccountsController.cs

@@ -2,6 +2,7 @@
 using foodmarket.Api.Infrastructure.Authorization;
 using foodmarket.Application.Common;
 using foodmarket.Application.Common.Tenancy;
+using foodmarket.Application.Money;
 using foodmarket.Domain.Money;
 using foodmarket.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
@@ -149,7 +150,7 @@ public async Task<ActionResult<MoneyAccountRow>> Create([FromBody] MoneyAccountI
             StoreId = input.StoreId,
             CurrencyId = input.CurrencyId,
             OpeningBalance = input.OpeningBalance,
-            OpeningDate = input.OpeningDate,
+            OpeningDate = MoneyMath.AsUtc(input.OpeningDate),
             IsActive = input.IsActive,
             IsDefault = false,
         };
@@ -183,7 +184,7 @@ public async Task<ActionResult<MoneyAccountRow>> Update(Guid id, [FromBody] Mone
 
         // OpeningBalance/OpeningDate после создания менять нельзя — ломает
         // инвариант «CurrentBalance = Opening + Σ Posted».
-        if (a.OpeningBalance != input.OpeningBalance || a.OpeningDate != input.OpeningDate)
+        if (a.OpeningBalance != input.OpeningBalance || a.OpeningDate != MoneyMath.AsUtc(input.OpeningDate))
             return Problem("Начальный остаток и дата после создания счёта не редактируются.",
                 statusCode: 409, type: "https://food-market.kz/errors/opening-balance-locked");
 

src/food-market.api/Controllers/Money/MoneyTransactionsController.cs

@@ -163,7 +163,7 @@ public async Task<ActionResult<MoneyTxRow>> Create([FromBody] MoneyTxInput input
         {
             OrganizationId = orgId,
             Number = await MoneyNumbering.NextMoneyTxNumberAsync(_db, orgId, input.Date.Year, ct),
-            Date = input.Date,
+            Date = MoneyMath.AsUtc(input.Date),
             Kind = input.Kind,
             Status = MoneyTransactionStatus.Draft,
             AccountId = input.AccountId,
@@ -204,7 +204,7 @@ public async Task<ActionResult<MoneyTxRow>> Update(Guid id, [FromBody] MoneyTxIn
         if (input.Xmin is not null && input.Xmin.Value != 0)
             _db.Entry(mt).Property("xmin").OriginalValue = input.Xmin.Value;
 
-        mt.Date = input.Date;
+        mt.Date = MoneyMath.AsUtc(input.Date);
         mt.AccountId = input.AccountId;
         mt.CounterpartyId = input.CounterpartyId;
         mt.ExpenseItemId = input.ExpenseItemId;
@@ -292,7 +292,7 @@ public async Task<ActionResult<object>> Transfer([FromBody] TransferInput input,
         {
             OrganizationId = orgId,
             Number = await MoneyNumbering.NextMoneyTxNumberAsync(_db, orgId, input.Date.Year, ct),
-            Date = input.Date,
+            Date = MoneyMath.AsUtc(input.Date),
             Kind = MoneyTransactionKind.TransferOut,
             Status = MoneyTransactionStatus.Draft,
             AccountId = from.Id,
@@ -304,7 +304,7 @@ public async Task<ActionResult<object>> Transfer([FromBody] TransferInput input,
         {
             OrganizationId = orgId,
             Number = await MoneyNumbering.NextMoneyTxNumberAsync(_db, orgId, input.Date.Year, ct),
-            Date = input.Date,
+            Date = MoneyMath.AsUtc(input.Date),
             Kind = MoneyTransactionKind.TransferIn,
             Status = MoneyTransactionStatus.Draft,
             AccountId = to.Id,

src/food-market.application/Money/MoneyMath.cs

@@ -51,4 +51,17 @@ public static decimal AccountBalance(decimal openingBalance, decimal inSum, deci
     /// переплатив (payed + add ≤ total + ε).</summary>
     public static bool CanApplyPayment(decimal currentPayed, decimal addSum, decimal total)
         => currentPayed + addSum <= total + Eps;
+
+    /// <summary>Нормализует дату документа к UTC перед записью в
+    /// <c>timestamp with time zone</c>. Date-only из UI (<c>YYYY-MM-DD</c>)
+    /// десериализуется с <see cref="DateTimeKind.Unspecified"/> — Npgsql такой
+    /// в timestamptz не пишет (кидает 500), поэтому помечаем как UTC (та же
+    /// календарная дата, полночь UTC). Полный ISO с <c>Z</c> (Kind=Utc) —
+    /// as-is; локальный — переводим в UTC.</summary>
+    public static DateTime AsUtc(DateTime d) => d.Kind switch
+    {
+        DateTimeKind.Utc => d,
+        DateTimeKind.Local => d.ToUniversalTime(),
+        _ => DateTime.SpecifyKind(d, DateTimeKind.Utc),
+    };
 }

tests/food-market.IntegrationTests/MoneyModuleTests.cs

@@ -42,6 +42,26 @@ public async Task Tenant_B_cannot_see_tenant_A_money_accounts()
         ((int)direct.StatusCode).Should().Be(404);
     }
 
+    [Fact]
+    public async Task Account_create_accepts_date_only_opening_date_from_ui()
+    {
+        // UI (DateField) шлёт openingDate как "YYYY-MM-DD" (Kind=Unspecified).
+        // Регресс: такой DateTime Npgsql не писал в timestamptz → 500. Проверяем
+        // что контроллер нормализует к UTC (MoneyMath.AsUtc) и создаёт счёт.
+        var api = new ApiActor(_factory.CreateClient());
+        await api.SignupAndLoginAsync($"dateonly-{Guid.NewGuid():N}");
+        var refs = await api.LoadRefsAsync();
+        using var resp = await api.Http.PostAsJsonAsync("/api/money/accounts", new
+        {
+            name = "Касса (date-only)", kind = Cash, bankName = (string?)null, accountNumber = (string?)null,
+            storeId = refs.StoreId, currencyId = refs.CurrencyId,
+            openingBalance = 50_000m, openingDate = "2026-10-07", // ← строго date-only
+            isActive = true, isDefault = false,
+        });
+        resp.IsSuccessStatusCode.Should().BeTrue($"date-only openingDate должен приниматься: {(int)resp.StatusCode} {await resp.Content.ReadAsStringAsync()}");
+        (await resp.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("currentBalance").GetDecimal().Should().Be(50_000m);
+    }
+
     [Fact]
     public async Task Account_balance_invariant_opening_plus_posted_movements()
     {