feat(selfhost): add Postgres observability dashboards

[JSONbored]

Summary

Part of #2011. This adds the Postgres observability slice for self-host operators: exporter wiring, Prometheus scrape jobs, Grafana panels, alerts, backup freshness metrics, and operations docs.

What changed

• Added a Postgres exporter sidecar for Postgres-backed self-host deployments.
• Added a read-only backup freshness exporter for the retained backup volume.
• Added Prometheus scrape jobs for Postgres internals and backup freshness.
• Added Grafana panels for connection count/state, lock waits, slow transactions, deadlocks, database/table growth, dead tuples, autovacuum activity, and backup age/file counts.
• Added Prometheus alerts for connection pressure, lock waits, slow transactions, deadlocks, rapid DB growth, dead tuple pressure, missing backups, and stale backups.
• Updated self-host operations docs with the Postgres observability commands and routine checks.

Why

After the SQLite-to-Postgres cutover work, operators need first-class visibility into whether Postgres is healthy or becoming the next queue bottleneck. This makes the default self-host observability stack show the database pressure signals directly instead of requiring manual container inspection.

Validation

• npx vitest run test/unit/selfhost-backup-metrics-script.test.ts test/unit/selfhost-observability-config.test.ts test/unit/selfhost-grafana-dashboard.test.ts
• npx vitest run test/unit/selfhost-backup-metrics-script.test.ts test/unit/selfhost-observability-config.test.ts test/unit/selfhost-grafana-dashboard.test.ts test/unit/codecov-policy.test.ts
• npm run ui:lint
• npm run ui:typecheck
• npm run typecheck
• docker compose --profile postgres --profile observability --profile backup config
• npm run test:ci
• npm audit --audit-level=moderate

Notes

The Postgres exporter is scoped to the Postgres profiles, so SQLite-only observability installs do not start it against a missing database. Backup freshness metrics are opt-in with the backup profile.

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	gittensory-ui	5ed3d54	Commit Preview URL Branch Preview URL	Jul 01 2026, 09:17 AM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.71%. Comparing base (704cebc) to head (5ed3d54).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2115   +/-   ##
=======================================
  Coverage   95.71%   95.71%           
=======================================
  Files         222      222           
  Lines       24620    24620           
  Branches     8936     8936           
=======================================
  Hits        23565    23565           
  Misses        432      432           
  Partials      623      623           

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.