text: /* Drop foreign keys and rename existing auditing columns */
  ALTER TABLE auditing DROP CONSTRAINT fk_auditing_user;
  ALTER TABLE auditing DROP CONSTRAINT fk_auditing_message;
  ALTER TABLE auditing CHANGE COLUMN user_email username VARCHAR(100);
  ALTER TABLE auditing CHANGE COLUMN message_key_id filename VARCHAR(100);
  ALTER TABLE auditing ADD COLUMN action VARCHAR(100) NOT NULL;
  
  /* Drop message and user tables */
  DROP TABLE message;
  DROP TABLE user;