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retro: tick postgres tuning item #427

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Merged
espadonne merged 1 commit into from
Sep 3, 2026
Merged

retro: tick postgres tuning item #427

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13 changes: 12 additions & 1 deletion docs/internal/retro/2026-09-02-availability-sitrep.md
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Expand Up @@ -388,7 +388,18 @@ deploy/audit/check-droplet-drift.sh # runs locally, ssh's to the box
Then confirm the gauge is live:
`curl -fsS 127.0.0.1:8080/metrics | grep shithub_backup_last_success`.

### 7. Apply `postgresql.conf.j2` and enable `pg_stat_statements`
### 7. Apply `postgresql.conf.j2` and enable `pg_stat_statements` — DONE 2026-09-03

Done at 05:17–05:19 UTC inside the quiet window, by hand (no Ansible on
the operator machine): snapshot at `postgresql.conf.pre-tune`, six
settings edited (`shared_buffers=256MB`, `work_mem=4MB`,
`effective_cache_size=1GB`, `maintenance_work_mem=64MB`,
`max_connections=60`, `shared_preload_libraries='pg_stat_statements'`),
Postgres restarted (healthy in 8.5 s; web and worker bounced with it),
`CREATE EXTENSION pg_stat_statements` applied. Verified via
`pg_settings`. The first `traffic:purge` had already completed at
05:15:21 (18 s; paths 1.26M→716k, uniques 1.34M→769k). No OOM
overnight.

Needs a **Postgres restart**, inside the 05:15–06:00 UTC quiet
window, never via a blind `make deploy`. The full procedure with
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