set autocommit=0;
use accounting;

ALTER TABLE accounting.malicious_calls DROP COLUMN source;

SELECT id into @vp_id FROM provisioning.voip_preferences where attribute = 'identifier';
DELETE FROM provisioning.voip_dom_preferences WHERE attribute_id = @vp_id;
DELETE FROM provisioning.voip_peer_preferences WHERE attribute_id = @vp_id;
DELETE FROM provisioning.voip_preferences WHERE attribute = 'identifier';

commit;