Set purge / aging properties:
If you want the system to automatically purge aged unreferenced items without you clicking through the UI, consider setting below properties
wt.fv.purgeUnreferencedFvItemsInterval (days between purges; default 1)
wt.fv.purgeUnreferencedFvItemsOlderThan (age threshold in days; default 30)
wt.fv.purgeUnreferencedMORItemsOlderThan (age for MasteredOnReplicaItems; default 30, min 2)
wt.fv.purgeUnreferencedFilesOlderThan (age threshold for physical files when “Remove Unreferenced Files” is run)
Validate on a test server first and make sure the sync is working smooth