fix: avoid SQLite lock on fast position poll by skipping DB writes

Co-authored-by: Cursor <cursoragent@cursor.com>

install_trading.py

@@ -33,6 +33,7 @@ from position_stream import position_hub, start_position_worker
 from ctp_reconnect import start_ctp_reconnect_worker
 from ctp_premarket_connect import start_ctp_premarket_connect_worker
 from ctp_fee_worker import start_ctp_fee_worker
+from db_conn import execute_retry
 from sl_tp_guard import (
     cancel_monitor_exit_orders,
     ensure_monitor_order_columns,
@@ -480,7 +481,8 @@ def install_trading(app, *, login_required, require_nav, get_db, get_setting, se
                     open_time_val = ctp_open
             elif ctp_open:
                 open_time_val = ctp_open
-            conn.execute(
+            execute_retry(
+                conn,
                 """UPDATE trade_order_monitors SET lots=?, entry_price=?,
                    open_time=? WHERE id=?""",
                 (
@@ -684,7 +686,7 @@ def install_trading(app, *, login_required, require_nav, get_db, get_setting, se
                         break
             elif key in ctp_by_key:
                 used_ctp_keys.add(key)
-            if ctp and mon:
+            if ctp and mon and not fast:
                 _sync_monitor_lots_from_ctp(
                     conn, int(mon["id"]), mon.get("symbol") or "",
                     mon.get("direction") or "long", mode, ctp=ctp,
@@ -896,7 +898,6 @@ def install_trading(app, *, login_required, require_nav, get_db, get_setting, se
         try:
             init_strategy_tables(conn)
             payload = _build_trading_live_payload(conn, fast=True)
-            conn.commit()
             position_hub.set_snapshot(payload)
             return jsonify(payload)
         finally: