Allow to configure conn_max_age

aleksis/apps/untis/settings.py

@@ -9,6 +9,7 @@ if _settings.get("untis.database.enabled"):
             "PASSWORD": _settings.get("untis.database.password", None),
             "HOST": _settings.get("untis.database.host", "127.0.0.1"),
             "PORT": _settings.get("untis.database.port", 3306),
+            "CONN_MAX_AGE": _settings.get("untis.database.conn_max_age", 0),
             "OPTIONS": _settings.get("untis.database.options", {}),
         }
     }