Hi! Thanks for the library!

I have some interesting bug with overriden SQLAlchemyBaseAccessTokenTable.
For my implementation it was necessary to overwrite the name of the User table, so my code looks like

class JWTToken(SQLAlchemyBaseAccessTokenTable[int], Base):
    ...
    user_id: Mapped[int] = mapped_column(
        Integer,
        ForeignKey("app_users_user.id", ondelete="cascade"),
        nullable=False,
    )

Note that I use the SQLAlchemyBaseAccessTokenTable[int] inheritance, not SQLAlchemyBaseAccessTokenTableUUID

on app startup i see this warning

/usr/lib/python3.11/inspect.py:573: SAWarning: Unmanaged access of declarative attribute user_id from non-mapped class SQLAlchemyBaseAccessTokenTableUUID

Obviosly this warning is not expected.

Configuration

• Python version : 3.11
• FastAPI version : 0.115.6
• FastAPI Users version : 14.0.0

Suggestions

Neither SQLAlchemyBaseAccessTokenTable nor SQLAlchemyBaseAccessTokenTableUUID has sqlalchemy declarative meta cofigured, they are just mixins.
I don't really know why declared_attr decorator is used, but if it is possible it can be replaced by plain mapped attr like:

class SQLAlchemyBaseAccessTokenTable(Generic[ID]):
    """Base SQLAlchemy access token table definition."""

    __tablename__ = "accesstoken"
    __user_tablename_id__ = 'user.id'

    if TYPE_CHECKING:  # pragma: no cover
        token: str
        created_at: datetime
        user_id: ID
    else:
        token: Mapped[str] = mapped_column(String(length=43), primary_key=True)
        created_at: Mapped[datetime] = mapped_column(
            TIMESTAMPAware(timezone=True), index=True, nullable=False, default=now_utc
        )
        user_id: Mapped[ID] = mapped_column(
            ForeignKey(__user_tablename_id__, ondelete="cascade"),
            nullable=False
        )

also hardcoded user tablename can be replaced by the class attr, f.e. __user__tablename__ (or __user_tablename_id__ for direct fk link) so it would be easier to configure inherited classes