Hi, I noticed that the update timestamp for history objects gets "updated" when these are deleted or purged using the cleanup_datasets.py script. When userless histories older than 30 days, for example, are deleted with this script, they cannot then be purged immediately (along with associated datasets) unless the --days 0 option is used. However, I think this would also purge histories that have been recently deleted through the web interface by a user. It seems that to prevent that happening I'd need to wait another 30 days before really freeing up disk space associated with files from the old userless histories. Perhaps I've misunderstood something about the way is supposed to work? Thanks Matt