def METHOD_NAME(self):
    """
    Delete all Comment entries.
    :raises `~aiida.common.exceptions.IntegrityError`: if all Comments could not be deleted
    """
    session = self.backend.get_session()
    try:
        session.query(self.ENTITY_CLASS.MODEL_CLASS).delete()
        session.commit()
    except Exception as exc:
        session.rollback()
        raise exceptions.IntegrityError(f'Could not delete all Comments. Full exception: {exc}')