fix: 修复session维护过程的bug

main.py

@@ -53,5 +53,11 @@ if __name__ == '__main__':
         try:
             time.sleep(86400)
         except KeyboardInterrupt:
+            try:
+                for session in pkg.openai.session.sessions:
+                    pkg.openai.session.sessions[session].persistence()
+            except Exception as e:
+                if not isinstance(e, KeyboardInterrupt):
+                    raise e
             print("程序退出")
             break

pkg/database/manager.py

@@ -35,8 +35,8 @@ class DatabaseManager:
 
     def heartbeat(self):
         while True:
-            self.conn.ping(reconnect=True)
             time.sleep(30)
+            self.conn.ping(reconnect=True)
 
     def reconnect(self):
         self.conn = pymysql.connect(host=self.host, port=self.port, user=self.user, password=self.password,