Most par2 sets describe readable uploads whose files are never hashed, so they were never complete and kept forever (19 GB). Candidates added to a release after it settled were never marked ready (93,642 since 2026-10-13); the batch store and merge mark them now, migration 5100 repairs the waiting ones (LOG.md 2026-10-20 (87)). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>