func AddSimple(q Queue, tx *reform.TX,
	jobType, relatedType, relatedID, creator string) error {
	return AddWithData(q, tx,
		jobType, relatedType, relatedID, creator, &struct{}{})
}
func AddSimple(q Queue, tx *reform.TX,
	jobType, relatedType, relatedID, creator string) error {
	return AddWithData(q, tx,
		jobType, relatedType, relatedID, creator, &struct{}{})
}
// AddSimple is convenience method to add a job.