refactor: recycle db connection to avoid "the connection is closed" exception. (#3726)

Author: shaohuzhang1

apps/smartdoc/conf.py

@@ -116,7 +116,8 @@ def get_db_setting(self) -> dict:
             "POOL_OPTIONS": {
                 "POOL_SIZE": 20,
                 "MAX_OVERFLOW": int(self.get('DB_MAX_OVERFLOW')),
-                'RECYCLE': 30 * 60
+                "RECYCLE": 1800,
+                "TIMEOUT": 30
             }
         }