Fixed value for updated_at column

The onupdate parameter on the updated_at column can take a function that is evaluated every time the entity is updated.

This is the current code

class CreateUpdateMixin:
    created_at: Mapped[int] = mapped_column(Integer, nullable=False, server_default=text("(UNIX_TIMESTAMP())"))
    updated_at: Mapped[int] = mapped_column(
        Integer, nullable=False, server_default=text("UNIX_TIMESTAMP()"), onupdate=round(time())
    )

The time is evaluated when the server is started and then this fixed values is always set when the entity is updated. The call to time has to be wrapped inside a lambda function to evaluted it dynamically when it is requested.

class CreateUpdateMixin:
    created_at: Mapped[int] = mapped_column(Integer, nullable=False, server_default=text("(UNIX_TIMESTAMP())"))
    updated_at: Mapped[int] = mapped_column(
        Integer, nullable=False, server_default=text("UNIX_TIMESTAMP()"), onupdate=lambda: round(time())
    )