# 2026-04-17 — Service health checks and dynamic Apps page

**Timestamp:** 2026-04-17T00:00:00Z

## Summary

Added a background health-check system to the backend that polls each registered feature service every 30 seconds. The Apps page now renders dynamically based on live service status — showing "Unavailable" when a service is registered but its container is unreachable.

## Files Added / Modified / Deleted

### Added
- `backend/app/services/__init__.py` — package init
- `backend/app/services/service_health.py` — service registry, background polling loop (`POLL_INTERVAL=30s`), `get_all_statuses()` read API
- `backend/app/routers/services.py` — `GET /api/services` endpoint (requires auth)

### Modified
- `backend/app/core/config.py` — added `DOC_SERVICE_URL` setting (default `http://doc-service:8001`)
- `backend/app/main.py` — added FastAPI `lifespan` context manager: registers services, runs initial health check, starts background polling loop; mounts `/api/services` router
- `frontend/src/api/client.ts` — added `ServiceStatus` interface and `getServices()` API function
- `frontend/src/pages/AppsPage.tsx` — replaced hardcoded `APPS` array with dynamic query to `GET /api/services`; adds "Unavailable" state with dimmed card and explanation text
- `backend/STATUS.md` — documented `/api/services` endpoint and health-check architecture
- `frontend/STATUS.md` — documented dynamic Apps page behaviour