ALTER TABLE user_preferences ADD COLUMN set_date_new integer DEFAULT 0 NOT NULL;
UPDATE user_preferences SET set_date_new = set_date;
ALTER TABLE user_preferences DROP COLUMN set_date;
ALTER TABLE user_preferences RENAME COLUMN set_date_new TO set_date;
ALTER TABLE user_preferences ADD COLUMN set_date_new integer DEFAULT 0 NOT NULL;
UPDATE user_preferences SET set_date_new = set_date;
ALTER TABLE user_preferences DROP COLUMN set_date;
ALTER TABLE user_preferences RENAME COLUMN set_date_new TO set_date;