Client site status

How it works

1. Cron trigger. Cloudflare runs the Worker's scheduled() handler every 5 minutes.
2. Checks. All sites are requested in parallel with a 10-second timeout. The response time is the time to the first response headers, and the body is never downloaded.
3. Storage. Results go into D1 (Cloudflare's SQLite) in a single batch, and rows older than 30 days are pruned in the same batch.
4. API. /api/status aggregates uptime and medians, and is cached at the edge for 60 seconds.
5. UI. This board is a Svelte island that polls the API once a minute.

The list of sites comes from the same markdown files that generate the case studies, so adding a project adds it to monitoring.