Called just after an execute call was successful.
        job_result is the value returned by the callback, if any.

def job_success(self, job, queue, job_result):
        """
        Called just after an execute call was successful.
        job_result is the value returned by the callback, if any.
        """
        job.queued.delete()
        job.hmset(end=str(datetime.utcnow()), status=STATUSES.SUCCESS)
        queue.success.rpush(job.ident)
        self.log(self.job_success_message(job, queue, job_result))
        if hasattr(job, 'on_success'):
            job.on_success(queue, job_result)