ALTER TABLE core_event_audit ADD COLUMN event_id int(11) NOT NULL DEFAULT 0;
ALTER TABLE core_event_audit ADD COLUMN name varchar(128) NOT NULL DEFAULT '';
ALTER TABLE core_event_audit ADD COLUMN old_audit_id int(11) NOT NULL DEFAULT 0;
-ALTER TABLE core_event_audit ADD COLUMN newvalue BLOB NOT NULL DEFAULT '';
+ALTER TABLE core_event_audit ADD COLUMN newvalue BLOB NOT NULL;
ALTER TABLE core_event_audit ADD INDEX lookup(event_id, name, old_audit_id);