Unused tables with disabled autovacuum block entire database at wraparound

Unused or abandoned test tables with autovacuum disabled can have oldest unfrozen transaction ID in database. Transaction IDs advance globally but freezing is per-table. Single forgotten table triggers database-wide wraparound protection.

Audit all tables for autovacuum configuration, especially test/abandoned tables. Check age(relfrozenxid) across all tables including unused ones. Drop genuinely unused tables. Never disable autovacuum on any table without time-bound re-enablement plan.