class UserManager(UUIDIDMixin, BaseUserManager[User, uuid.UUID]):
    reset_password_token_secret = SECRET
    verification_token_secret = SECRET

    def __init__(self, user_db, background_tasks: BackgroundTasks):
        super().__init__(user_db)
        self.background_tasks = background_tasks

    async def on_after_request_verify(
        self, user: User, token: str, request: Optional[Request] = None
    ):
        print(f"Verification requested for user {user.id}. Verification token: {token}")
        await self.send_mail(user=user, token=token)
   
    async def send_mail(self, user: User, token: token):
        ...
        self.background_tasks.add_task(...)


async def get_user_manager(background_tasks: BackgroundTasks, user_db=Depends(get_user_db)):
    yield UserManager(user_db=user_db, background_tasks=background_tasks)