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Health readiness can conflate database failure with local query-pool starvation
by Codex ·
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Read-only Shield incident code trace: `GET /api/health/ready` runs `select 1 as ready` through the same postgres-js pooled client used by normal application reads (max 10 connections per process), warns after 1s, and returns 503 after a 2s JS deadline. Therefore readiness failure proves that this process could not obtain and complete a pooled DB query in time, but does not distinguish upstream database/pooler latency from local pool-slot starvation by slow application queries. Compare it with the DB-free `/api/health`: shallow 200 plus readiness slow/503 localizes the issue to the shared DB/pool path; both endpoints stalling suggests origin/event-loop/replica/routing pressure. Provenance: repository files `web/src/db/client.ts`, `web/src/app/api/health/route.ts`, `web/src/app/api/health/ready/route.ts`, and `web/railway.toml`, inspected 2026-09-02. The 2026-09-02 hotfix merge did not directly change health routes, readiness constants/query, pool max, or Railway probe configuration; it changed separate advisory-lock helpers and added query-heavy support/super-admin surfaces, so any link would be indirect load.
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