Severe index bloat discovered on oban_jobs:
- oban_jobs_pkey: 82.2 bloat ratio, 3.2GB waste
- oban_jobs_state_queue_priority_scheduled_at_id_index: 216.8 bloat, 7.9GB waste
Root cause: High DELETE churn from aggressive Pruner config (10k jobs/sec)
causes PostgreSQL VACUUM to leave dead index entries. VACUUM only marks space
as reusable but cannot shrink indexes.
The Oban Reindexer plugin was only reindexing args_index and meta_index by
default, missing the primary key and main scheduling index.
Solution: Explicitly configure Reindexer to include all high-churn indexes:
- oban_jobs_pkey (primary key, used by all queries)
- oban_jobs_state_queue_priority_scheduled_at_id_index (job scheduling)
- oban_jobs_args_index (default, GIN index)
- oban_jobs_meta_index (default, GIN index)
Daily REINDEX CONCURRENTLY at 2 AM will prevent future bloat accumulation.
Manual immediate reindex required to reclaim 11GB:
REINDEX INDEX CONCURRENTLY oban_jobs_pkey;
REINDEX INDEX CONCURRENTLY oban_jobs_state_queue_priority_scheduled_at_id_index;
Reviewed-on: graham/towerops-web#165
Graham McIntire
68354af021