-- 011_ip_rib_perf_tuning.sql
-- Runtime performance tuning for ip_rib, derived from the 2026-05-19 ingestion
-- stress-test session. Idempotent.
--
-- Background: psql-app's unicast_prefix drain rate caps at a few-hundred msg/s
-- under continuous Postgres maintenance (autovacuum on ip_rib +
-- update_global_ip_rib() / update_chg_stats() / update_peer_rib_counts()
-- crons) competing for ip_rib disk I/O. Two levers applied here:
--
-- 1) Per-table autovacuum on ip_rib: lower scale_factor so autovacuum runs
--    more often on smaller chunks instead of one long disk-storm per cycle
--    (cost_limit kept high so each run finishes fast -- short intense
--    bursts let the consumer run flat out between them).
--
-- 2) Drop four unused/redundant ip_rib indexes (every INSERT updates every
--    index; these had 0 scans across ~2h of fleet convergence + storms +
--    operator activity). 9 -> 5 indexes; ~3.4 GB freed.
--      - ip_rib_hash_id_idx           (907 MB, btree hash_id; the composite
--                                      pkey is (peer_hash_id, hash_id) so a
--                                      hash_id-alone index has no caller)
--      - ip_rib_base_attr_hash_id_idx (558 MB, no reverse-join caller)
--      - ip_rib_prefix_idx            (1538 MB, GiST prefix inet_ops; only
--                                      used by ad-hoc prefix-containment
--                                      queries -- recreate if needed)
--      - ip_rib_origin_as_idx         (364 MB, btree origin_as; the composite
--                                      (peer_hash_id, origin_as) handles
--                                      most ASN queries)
--
-- Recovery for dropped indexes (no downtime):
--   CREATE INDEX CONCURRENTLY ip_rib_prefix_idx ON ip_rib USING gist (prefix inet_ops);
--   CREATE INDEX CONCURRENTLY ip_rib_origin_as_idx ON ip_rib (origin_as);
--   ... etc.

ALTER TABLE ip_rib SET (
    autovacuum_vacuum_scale_factor  = 0.02,
    autovacuum_analyze_scale_factor = 0.02
);

DROP INDEX IF EXISTS ip_rib_hash_id_idx;
DROP INDEX IF EXISTS ip_rib_base_attr_hash_id_idx;
DROP INDEX IF EXISTS ip_rib_prefix_idx;
DROP INDEX IF EXISTS ip_rib_origin_as_idx;