数据库管理器单例模式

plugins/stats_collector/main.py

@@ -51,7 +51,7 @@ class StatsCollectorPlugin(PluginInterface):
         }
 
         self.event_manager = EventManager.get_instance()
-        self.db_manager = DBConnectionManager()
+        self.db_manager = DBConnectionManager.get_instance()
         self.stats_db = StatsDBOperator(self.db_manager)
 
     def initialize(self, config: Dict[str, Any]) -> bool:

plugins/stats_dashboard/dashboard_server.py

@@ -21,7 +21,7 @@ class DashboardServer:
         self.logger = logging.getLogger("DashboardServer")
     
         # 修正：使用单例模式获取数据库连接
-        self.db_manager = DBConnectionManager()
+        self.db_manager = DBConnectionManager.get_instance()
         self.stats_db = StatsDBOperator(self.db_manager)
         self.app = self._create_app()
         self._stop_event = threading.Event()