The reverted "missing from master" feature had shipped migration 11, so databases that ran it skipped the new auto_cleanup_empty migration (also 11) and every pairs query failed, showing no libraries. Restore the old 11 as an unused placeholder like 6-10 and add the column as 12; a database that ran it under the old number counts it as applied. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>