"""Delete one or multiple XCom entries."""
        if isinstance(xcoms, XCom):
            xcoms = [xcoms]
        for xcom in xcoms:
            if not isinstance(xcom, XCom):
                raise TypeError(f"Expected XCom; received {xcom.__class__.__name__}")
            session.delete(xcom)
        session.commit()
    @overload
    @classmethod
    def clear(