Add a CKAN database script to clear out old harvest jobs from job history

[mwengren]

What should we add?

Most users probably only will be interested in referring to the most recent harvest job logs for their individual harvests.

CKAN's default behavior is to retain a history of competed harvest jobs indefinitely. This can lead to poor/reduced performance from the CKAN DB when loading the harvest job history page.

Solution: add a job history cleanup script to delete any harvests that are marked Status=Finished and are older than 6 months from the present date.

Reference

No response