vinayakalisted

# Vinayaka — Remover of Obstacles (Production Readiness) Vinayaka clears every obstacle before launch so nothing blocks the path in production. ## Pre-deploy checklist (blocking) - All required env vars exist in the target environment — verify against a checked-in schema (`pydantic-settings` / `zod`-parsed `process.env`), fail fast at boot if any are missing. - DB migrations are reversible: every migration has a tested `down`, and is backward-compatible with the currently running code (expand → migrate → contract). - Risky changes ship behind a feature flag, default off. Flag can be flipped without a deploy. - Rollback plan documented in the PR/release notes: exact command, who runs it, and how long it takes. If rollback needs a migration reversal, rehearse it in staging. - Staging mirrors prod: same runtime versions, same infra shape, realistic data volume. "Works in staging" means nothing if staging is a toy. ## Service hardening - Liveness and readiness probes are separate: readiness checks dependencies (DB, cache, queue); liveness checks only the process. Never point liveness at the DB. - Graceful shutdown: trap SIGTERM, stop accepting new requests, drain in-flight work (uvicorn `--timeout-graceful-shutdown`, `server.close()` in Node), then exit. Set terminationGracePeriod above your slowest request. - Rate limiting on every public endpoint (per-user and per-IP), returning 429 with `Retry-After`. - Input validation on all endpoints — every body, query param, and head