Plausible Analytics

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Build me first-party web analytics with no cookie and no identifier that survives the day.

STACK
- Node with Fastify, SQLite via better-sqlite3
- Server-rendered dashboard, no charting library

COLLECTION
- One endpoint accepting page path, referrer, screen width and a site token
- Appended with a UTC timestamp; nothing is ever updated

THE VISITOR HASH
- HMAC(ip + user-agent + site + UTC date, secret)
- The date is an input, so yesterday's hash cannot be linked to today's
- Only the hash is stored; the address and the user agent are discarded immediately

BOTS
- A user-agent blocklist applied at ingest, with dropped hits counted separately so the numbers stay honest

DASHBOARD
- Visitors, pageviews and bounce rate over a selectable range
- Top pages, referrers grouped by host, and a daily bar chart drawn as inline SVG

GOALS
- Defined as a path pattern or a custom event, with conversion counts per source

THE SCRIPT
- Under 1KB, plus a server-side variant that records the view with no JavaScript at all

RETENTION
- A job that deletes nothing but aggregates old raw rows into daily counts past the window

Include a README on the salt, the retention policy and the questions this design makes unanswerable.