Delete a row from the DB.

        :param session: flask_sqlalchemy session object
        :param commit: whether to issue the commit
        :param soft: whether this is a soft delete (i.e., update time_removed)

def delete(self, session, commit=True, soft=True):
        """
        Delete a row from the DB.

        :param session: flask_sqlalchemy session object
        :param commit: whether to issue the commit
        :param soft: whether this is a soft delete (i.e., update time_removed)
        """
        if soft:
            self.time_removed = sqlalchemy.func.unix_timestamp()
        else:
            session.delete(self)

        if commit:
            session.commit()