Powerdns filters on models.Records vs Record

    # RecordSet Methods
    def update_recordset(self, context, domain, recordset):
        # Ensure records are updated
        values = {'ttl': recordset['ttl']}

        query = self.session.query(models.Records)
        query.filter_by(designate_recordset_id=recordset['id']).update(values)

        self._update_soa(domain)

    def delete_recordset(self, context, domain, recordset):
        # Ensure records are deleted
        query = self.session.query(models.Records)
        query.filter_by(designate_recordset_id=recordset['id']).delete()

        self._update_soa(domain)

This makes the update or deletion fail of a rrset.