Fix CTP vnctptd segfault restart loop by serializing reconnect.

Skip duplicate auto-connect when TD is logged in, stop aggressive query_position hooks, and throttle position refresh.

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

install_trading.py

@@ -80,6 +80,7 @@ from trading_context import (
 )
 from ctp_symbol import ths_to_vnpy_symbol
 from vnpy_bridge import (
+    _ctp_td_lock,
     ctp_cancel_order,
     ctp_connect,
     ctp_get_account,
@@ -1029,7 +1030,8 @@ def install_trading(app, *, login_required, require_nav, get_db, get_setting, se
         mode = get_trading_mode(get_setting)
         if not fast and ctp_status(mode).get("connected"):
             try:
-                get_bridge().refresh_positions()
+                with _ctp_td_lock:
+                    get_bridge().refresh_positions()
             except Exception as exc:
                 logger.debug("refresh positions before snapshot: %s", exc)
         conn = get_db()
@@ -2240,8 +2242,15 @@ def install_trading(app, *, login_required, require_nav, get_db, get_setting, se
         notify_fn=send_wechat_msg,
         interval=1,
     )
+    _pos_refresh_tick = {"n": 0}
+
+    def _position_worker_refresh() -> dict:
+        _pos_refresh_tick["n"] += 1
+        # 每秒轻量刷新；每 5 秒做一次 CTP 持仓/挂单对账，避免频繁 query 导致 vnctptd 崩溃
+        return _refresh_trading_live_snapshot(fast=(_pos_refresh_tick["n"] % 5 != 0))
+
     start_position_worker(
-        refresh_fn=lambda: _refresh_trading_live_snapshot(fast=False),
+        refresh_fn=_position_worker_refresh,
         interval=1,
     )
     _bootstrap_trading_runtime()