dmb.gnu open error fixed

app_utils/conf.py

@@ -15,7 +15,7 @@ class PersistentSettings(BaseModel):
     """
 
     def __init__(self, **data: Any):
-        with shelve.open("config.db") as db:
+        with shelve.open("config.db", flag="n", protocol=2) as db:
             super().__init__(**db.get("settings", default={}), **data)
 
     def update(self, **data: Any) -> None: