if the information required to create the iiif manifest is not yet contained in the index, the job is returned to the queue

To prevent a high load from this enqueue/dequeue process (every second or less), we increase the wait time (30s, 90s, 180s, 300s, 3600s, 3600s, 7200s)

If the job cannot be completed after 8 restarts, it will not be added to the queue again and the failed job will be logged.