Sink is a URL shortener with analytics deployed on Cloudflare
According to the developer's description (Simplified Chinese), Cloudflare Workers Analytics Engine supports data written and API queries. Therefore, the developer specifically created an MVP version that supports up to 3,000,000 visited per month. Cloudflare backend is using ClickHouse, so the performance should not be a problem.
It is now open source for self-hosted deployment. The point is it runs 100% on Cloudflare.
Demo permalink
https://sink.cool
Site Token: SinkCool