update

backend/app/services/price_monitor_service.py

@@ -15,8 +15,22 @@ class PriceMonitorService:
     # Binance API
     BASE_URL = "https://api.binance.com"
 
+    _instance = None
+    _initialized = False
+
+    def __new__(cls):
+        """单例模式 - 确保只有一个实例"""
+        if cls._instance is None:
+            cls._instance = super().__new__(cls)
+        return cls._instance
+
     def __init__(self):
         """初始化价格监控服务"""
+        # 防止重复初始化
+        if PriceMonitorService._initialized:
+            return
+
+        PriceMonitorService._initialized = True
         self.settings = get_settings()
         self.running = False
         self.subscribed_symbols: Set[str] = set()
@@ -32,7 +46,7 @@ class PriceMonitorService:
     def start(self):
         """启动价格轮询"""
         if self.running:
-            logger.warning("价格监控服务已在运行")
+            logger.debug("价格监控服务已在运行")
             return
 
         self.running = True
@@ -51,6 +65,8 @@ class PriceMonitorService:
                         break
                     time.sleep(0.1)
 
+        # 防止重复创建线程
+        if self._poll_thread is None or not self._poll_thread.is_alive():
             self._poll_thread = threading.Thread(target=_poll_loop, daemon=True)
             self._poll_thread.start()