added image_name to PlateOrder model

sse/services.py

@@ -82,6 +82,43 @@ def cleanup_all_connections():
     logger.info("所有SSE连接已清理")
 
 
+def shutdown_merchant_connections(merchant_id):
+    """
+    关闭指定商户的所有连接
+    
+    参数:
+    - merchant_id: 商户ID
+    
+    返回:
+    - int: 关闭的连接数
+    """
+    if merchant_id not in _connections:
+        return 0
+    
+    connections = _connections[merchant_id]
+    count = len(connections)
+    
+    # 向每个连接发送关闭信号
+    for conn_queue in list(connections):
+        try:
+            conn_queue.put_nowait({
+                'type': 'server_shutdown',
+                'message': 'Server shutting down your connections, please reconnect later'
+            })
+        except queue.Full:
+            # 队列满了，跳过
+            pass
+        except Exception:
+            # 其他异常，也跳过
+            pass
+    
+    # 删除所有连接
+    del _connections[merchant_id]
+    
+    logger.info(f"关闭商户 {merchant_id} 的 {count} 个 SSE 连接")
+    return count
+
+
 def push_sse_event_to_all(event_data: dict):
     """
     向所有连接的客户端广播一个 SSE 事件（同步队列版本）