TVPro diagnostic ingest
  POST /ingest            (X-TVPro-Key)
  GET  /health            liveness + disk usage
  GET  /devices?days=7    per-device rollup
  GET  /recent?minutes=60&device=&cat=&level=&contains=&limit=200
  GET  /summary?days=7    per-version rollup
  GET  /dl?day=&dev=      raw ndjson.gz