refactor: recycle db connection to avoid "the connection is closed" exception.

Author: liqiang-fit2cloud

apps/maxkb/conf.py

@@ -59,9 +59,12 @@ def get_db_setting(self) -> dict:
             "USER": self.get('DB_USER'),
             "PASSWORD": self.get('DB_PASSWORD'),
             "ENGINE": self.get('DB_ENGINE'),
+            "CONN_MAX_AGE": 0,
             "POOL_OPTIONS": {
                 "POOL_SIZE": 20,
-                "MAX_OVERFLOW": int(self.get('DB_MAX_OVERFLOW'))
+                "MAX_OVERFLOW": int(self.get('DB_MAX_OVERFLOW')),
+                'RECYCLE': 1800,
+                'TIMEOUT': 30
             }
         }