Add basic Card type

from sqlalchemy.orm import Mapped, mapped_column

from poolpay.model.Retrievable import Retrievable

class Card(Retrievable):

    """

    A card, most likely a pool card. It has an id (which is read from the card), and belongs to a person.

    """

    __tablename__ = "card"

    id: Mapped[int] = mapped_column(primary_key=True)

    @property

    def primary_key(self) -> int:

        return self.id