Add PostgreSQL production backend to eliminate SQLite lock contention.

Support DATABASE_URL with connection pooling, pg_dump backups, SQLite migration script, and deploy_postgres.sh with docs.

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

sl_tp_guard.py

@@ -616,10 +616,25 @@ def reconcile_monitors_without_position(conn, mode: str, *, grace_sec: int = 120
         sym = (p.get("symbol") or "").lower()
         direction = p.get("direction") or "long"
         position_keys.add((sym, direction))
+    try:
+        from ctp_trading_state import trading_state
 
-    margin_used = ctp_account_margin_used(mode) or 0.0
+        for p in trading_state.get_positions() or []:
+            lots = int(p.get("lots") or 0)
+            if lots <= 0:
+                continue
+            sym = (p.get("symbol") or "").lower()
+            direction = p.get("direction") or "long"
+            position_keys.add((sym, direction))
+    except Exception:
+        pass
+
+    margin_raw = ctp_account_margin_used(mode)
+    if margin_raw is None:
+        return 0
+    margin_used = float(margin_raw or 0.0)
     if not position_keys:
-        if margin_used > 100:
+        if margin_used > 0:
             return 0
         try:
             bridge = get_bridge()
@@ -686,6 +701,14 @@ def _execute_local_close(
     positions = ctp_list_positions(mode)
     pos = _find_position(positions, sym, direction)
     if not pos:
+        margin_raw = ctp_account_margin_used(mode)
+        if margin_raw is not None and float(margin_raw) > 0:
+            logger.debug(
+                "skip close monitor=%s: vnpy empty but margin=%.2f",
+                mon.get("id"),
+                float(margin_raw),
+            )
+            return
         _close_all_monitors_for_symbol(conn, sym, direction)
         reconcile_monitors_without_position(conn, mode)
         return