- Replace single unbounded DELETE FROM storage.blobs WHERE ref_count=0
with a loop of DELETE...LIMIT 500 batches using ctid sub-select
- Each batch is its own implicit TX (~1-5 ms), preventing:
· massive row-lock accumulation (was ~200 bytes × N orphans in PG)
· WAL bloat from a single giant DELETE
· blocking concurrent uploads on storage.blobs
- Blob files deleted AFTER each batch commits (crash-safe)
- tokio::task::yield_now() between batches to avoid starving uploads
Dionisio
1ad7a32a61