View real-time stats in the Data Retention dashboard: total/free disk, database/artifact sizes, percentages, and counts. Cache refreshes automatically post-cleanup.
For optimization, a VACUUM job reclaims space if sufficient free disk exists (database size + 10% buffer). Run via cron nightly.
Purged data is irreversible; export critical reports beforehand. Use partial purges for errors to retain analytics value. For projects, admins can purge all data or attachments via danger zone, triggering dedicated jobs.