chore(release): prepare v0.3.1

app/repositories/postgres.py

@@ -7,7 +7,7 @@ import json
 import logging
 import uuid
 from dataclasses import dataclass
-from datetime import UTC, date, datetime
+from datetime import UTC, datetime
 from decimal import ROUND_HALF_UP, Decimal, InvalidOperation
 from typing import Any
 
@@ -22,10 +22,10 @@ from app.domain.errors import (
     StrategyNotFoundError,
 )
 from app.domain.models import (
-    CorporateAction,
     Asset,
     AuthToken,
     BrokerCredential,
+    CorporateAction,
     Daemon,
     LedgerEntry,
     Portfolio,
@@ -1631,7 +1631,7 @@ class PostgresPortfolioRepository:
     def record_corporate_action(self, portfolio_id: str, *, action: CorporateAction, idempotency_key: str, payload_hash: str) -> CorporateAction:
         """Persist an immutable action and snapshot atomically."""
         self.ensure_schema()
-        with self._connect() as conn:
+        with self._connect() as conn:  # noqa: SIM117 - keep transaction and cursor lifetimes explicit
             with conn.cursor() as cur:
                 cur.execute("SELECT asset_quantity, cash_balance, profit_buffer, asset_id, status FROM portfolios WHERE portfolio_id=%s FOR UPDATE", (portfolio_id,))
                 row = cur.fetchone()