feat: add bounded KIS account read recovery

tests/adapters/persistence/test_account_snapshot_store.py

@@ -0,0 +1,37 @@
+"""PostgreSQL account snapshot persistence contract."""
+from __future__ import annotations
+
+from datetime import datetime, timezone
+
+from trex_core.adapters.persistence.account_snapshot import (
+    PostgreSQLAccountSnapshotStore,
+)
+from trex_core.application.account_snapshot import AccountSnapshot
+from trex_core.application.broker_port import BalanceItem
+
+
+def test_round_trip_keeps_independent_capture_times(pg_clean):
+    store = PostgreSQLAccountSnapshotStore(pg_clean)
+    holdings_at = datetime(2026, 7, 29, 0, 0, tzinfo=timezone.utc)
+    cash_at = datetime(2026, 7, 28, 23, 59, tzinfo=timezone.utc)
+    expected = AccountSnapshot(
+        account_hash="d" * 64,
+        holdings=(BalanceItem("005930", 2),),
+        holdings_captured_at=holdings_at,
+        available_cash=300_000,
+        cash_captured_at=cash_at,
+    )
+
+    store.save(expected)
+
+    assert store.load(expected.account_hash) == expected
+
+
+def test_refresh_guard_is_account_scoped_and_released(pg_clean):
+    store = PostgreSQLAccountSnapshotStore(pg_clean)
+    with store.refresh_guard("e" * 64) as first:
+        assert first is True
+        with store.refresh_guard("e" * 64) as second:
+            assert second is False
+    with store.refresh_guard("e" * 64) as after_release:
+        assert after_release is True

tests/adapters/persistence/test_migration_and_drift.py

@@ -18,6 +18,7 @@ _EXPECTED_TABLES = {
     "intent_log",
     "ledger_outbox",      # BAT-006 / REQ-019
     "snapshot_pause",     # BAT-008 / REQ-032
+    "broker_account_snapshot",  # dcy-041 / GitHub #45
 }