HTTP, appended directly

Do the Vercel setup first.

The route appends each request body as one commit. It is the shortest path, but each request is a commit: keep it to a few requests a minute per table. At one request per second, the store's requests alone cost about $3 a day, and commits, which happen one at a time, begin to wait on each other. A request body can be up to 4.5 MB.

Try it:

curl -X POST $URL/api/readings -H "authorization: Bearer $INGEST_TOKEN" -H "idempotency-key: gateway-1-000001" \
  -H "content-type: application/json" \
  -d '[{"time": "2026-01-05T10:00:00Z", "device_id": "pump-1", "temp": 61.2, "humidity": 40}]'

Send the same Idempotency-Key when retrying a request; a new batch gets a new key.