Hi Snow,

I would reconsider deleting import set records immediately. Many a times those are required for troubleshooting purpose.

https://<instance_name>/nav_to.do?uri=sysauto_script.do?sys_id=a060c407c0a8006f0067fef2befb357d

If I have to experiment, i would to that in my personal instance by checking how script include ImportSetCleaner works.

Based on that, I would consider to configure a schedule job which runs for specific import set table on daily basis.