Global Error Handler
`app.js` includes centralized error middleware that logs URL, method, IP, and user agent metadata before returning response payloads.
Backend Documentation
Errors and Observability
Operational behavior for failures, diagnostics, and runtime visibility.
404 Handler
Non-matched routes return `Resource not found` with status code `404` via terminal middleware.
Health Endpoint
`GET /api/health` reports environment, uptime, memory usage, and Mongo connection state to support readiness checks.
Graceful Shutdown
`hooks/performance.js` handles controlled server shutdown to reduce dropped connections and abrupt termination behavior.