Fix user-role table cleanup when user update

Author: wu-clan

backend/app/admin/crud/crud_user.py

@@ -127,6 +127,9 @@ async def update(self, db: AsyncSession, input_user: User, obj: UpdateUserParam)
         result = await db.execute(role_stmt)
         roles = result.scalars().all()
 
+        user_role_stmt = delete(user_role).where(user_role.c.user_id == input_user.id)
+        await db.execute(user_role_stmt)
+
         user_role_data = [AddUserRoleParam(user_id=input_user.id, role_id=role.id).model_dump() for role in roles]
         user_role_stmt = insert(user_role)
         await db.execute(user_role_stmt, user_role_data)