diff --git a/stock-html/routes/sim_trade.py b/stock-html/routes/sim_trade.py
index e0f981e..1ad05b6 100644
--- a/stock-html/routes/sim_trade.py
+++ b/stock-html/routes/sim_trade.py
@@ -648,15 +648,22 @@ def trigger_trade():
         # 降级: 使用旧引擎
         from services.scheduler import execute_auto_trade_for_user
         
-        conn = get_db()
-        if conn:
-            cur = conn.cursor(cursor_factory=RealDictCursor)
-            cur.execute("SELECT trade_quantity FROM sim_config WHERE user_id = %s", (user_id,))
-            config = cur.fetchone()
-            trade_quantity = config['trade_quantity'] if config else 1000
-            put_db(conn)
-        else:
+        conn = None
+        try:
+            conn = get_db()
+            if conn:
+                cur = conn.cursor(cursor_factory=RealDictCursor)
+                cur.execute("SELECT trade_quantity FROM sim_config WHERE user_id = %s", (user_id,))
+                config = cur.fetchone()
+                trade_quantity = config['trade_quantity'] if config else 1000
+            else:
+                trade_quantity = 1000
+        except Exception as e:
+            print(f"[trigger_trade] 获取交易配置失败: {e}")
             trade_quantity = 1000
+        finally:
+            if conn:
+                put_db(conn)
         
         result = execute_auto_trade_for_user(user_id, trade_quantity)
         
diff --git a/stock-html/services/scheduler.py b/stock-html/services/scheduler.py
index 01061aa..c14ef69 100644
--- a/stock-html/services/scheduler.py
+++ b/stock-html/services/scheduler.py
@@ -514,19 +514,22 @@ def job_morning_trade():
     for user in users:
         user_id = user['user_id']
         # 尝试使用智能引擎
+        smart_conn = None
         try:
             from services.smart_trade_engine import execute_smart_trade
             from db import get_db, put_db
-            conn = get_db()
-            if conn:
-                result = execute_smart_trade(conn, user_id, scan_date=None)
-                put_db(conn)
+            smart_conn = get_db()
+            if smart_conn:
+                result = execute_smart_trade(smart_conn, user_id, scan_date=None)
                 if result.get('success'):
                     print(f"[定时任务] 用户{user_id} 智能引擎执行成功 "
                           f"(算法:{result.get('algo','?')}, 信号:{result.get('signals',0)})")
                     continue
         except Exception as e:
             print(f"[定时任务] 用户{user_id} 智能引擎异常，降级到旧引擎: {e}")
+        finally:
+            if smart_conn:
+                put_db(smart_conn)
 
         # 降级：使用旧引擎
         trade_quantity = user.get('trade_quantity') or 1000
@@ -553,18 +556,21 @@ def job_afternoon_trade():
     for user in users:
         user_id = user['user_id']
         # 尝试使用智能引擎
+        smart_conn = None
         try:
             from services.smart_trade_engine import execute_smart_trade
             from db import get_db, put_db
-            conn = get_db()
-            if conn:
-                result = execute_smart_trade(conn, user_id, scan_date=today)
-                put_db(conn)
+            smart_conn = get_db()
+            if smart_conn:
+                result = execute_smart_trade(smart_conn, user_id, scan_date=today)
                 if result.get('success'):
                     print(f"[定时任务] 用户{user_id} 午后智能引擎执行成功")
                     continue
         except Exception as e:
             print(f"[定时任务] 用户{user_id} 智能引擎异常，降级: {e}")
+        finally:
+            if smart_conn:
+                put_db(smart_conn)
         trade_quantity = user.get('trade_quantity') or 1000
         execute_auto_trade_for_user(user_id, trade_quantity, scan_date=today)