fixed bugs and small changes

backend/permissions.py

@@ -71,28 +71,6 @@ def whoami(room_id: int, user_id: int) -> dict:
         "is_owner": role == "owner",
     }
 
-def get_member_role(room_id, user_id):
-    member = fetch_one(
-        """
-        SELECT role
-        FROM room_members
-        WHERE room_id = ?
-        AND user_id = ?
-        """,
-        (room_id, user_id),
-    )
-
-    if member is None:
-        return None
-
-    roles = {
-        "member": 1,
-        "admin": 2,
-        "owner": 3,
-    }
-
-    return roles.get(member["role"])
-
 
 # PUBLIC
 # ├── POST /create-user