-- 回滚：无法恢复原有值，仅将已清洗为 NULL 的记录恢复为 NOT NULL 约束允许的最小值
UPDATE tb_package_usage
SET activated_at = '1970-01-01 00:00:00',
    expires_at = '1970-01-01 00:00:00'
WHERE status = 0
  AND activated_at IS NULL;