ALTER TABLE core_person_signup ADD COLUMN person_type TEXT NOT NULL;
ALTER TABLE core_person_signup ADD COLUMN person_id int(11) NOT NULL default 0;
-ALTER TABLE core_person_signup ADD COLUMN person_table TEXT NOT NULL default '';
+ALTER TABLE core_person_signup ADD COLUMN person_table TEXT NOT NULL;
ALTER TABLE core_person_signup ADD COLUMN inviter_id int(11) NOT NULL default 0;