Insert a record identifier.

        :param val: The `recid` column value to insert.

def insert(cls, val):
        """Insert a record identifier.

        :param val: The `recid` column value to insert.
        """
        with db.session.begin_nested():
            obj = cls(recid=val)
            db.session.add(obj)
            cls._set_sequence(cls.max())