Fix ghost open positions: dedupe tickets and reconcile against MT5.

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

app/db.py

@@ -305,20 +305,33 @@ def list_trades(
     open_only: bool = False,
 ) -> list[dict]:
     clause, params = _trades_where(account_id, machine_id, open_only=open_only)
-    order = (
-        "ORDER BY COALESCE(t.open_time, t.created_at) DESC"
-        if open_only
-        else "ORDER BY COALESCE(t.close_time, t.open_time, t.created_at) DESC"
-    )
-    sql = f"""
-        SELECT t.*, a.name AS account_name, m.name AS machine_name
-        FROM trades t
-        LEFT JOIN accounts a ON a.id = t.account_id
-        LEFT JOIN machines m ON m.id = t.machine_id
-        {clause}
-        {order}
-        LIMIT ? OFFSET ?
-    """
+    if open_only:
+        # 持仓列表：同一账户+单号只显示最新一条
+        sql = f"""
+            SELECT t.*, a.name AS account_name, m.name AS machine_name
+            FROM trades t
+            LEFT JOIN accounts a ON a.id = t.account_id
+            LEFT JOIN machines m ON m.id = t.machine_id
+            {clause}
+              AND t.id = (
+                SELECT MAX(t2.id) FROM trades t2
+                WHERE t2.account_id = t.account_id
+                  AND t2.ticket = t.ticket
+                  AND (t2.close_time IS NULL OR t2.close_time='')
+              )
+            ORDER BY COALESCE(t.open_time, t.created_at) DESC
+            LIMIT ? OFFSET ?
+        """
+    else:
+        sql = f"""
+            SELECT t.*, a.name AS account_name, m.name AS machine_name
+            FROM trades t
+            LEFT JOIN accounts a ON a.id = t.account_id
+            LEFT JOIN machines m ON m.id = t.machine_id
+            {clause}
+            ORDER BY COALESCE(t.close_time, t.open_time, t.created_at) DESC
+            LIMIT ? OFFSET ?
+        """
     params.extend([limit, max(0, int(offset))])
     cur = conn.execute(sql, tuple(params))
     rows = []