Built in public
Only what changes something for the person using the site: new circuits, new sources, new checks.
Monza, Silverstone, Spa, Mexico City, Austin, Singapore, the Hungaroring, the Red Bull Ring and Zandvoort. Every field carries its own source and date. Prices stay in the organiser's own currency — we do not convert, because the rate on the day you buy will be different anyway.
It fetches the FIA source, obeys robots.txt, and compares the content — not the bytes. On its first run the page came back with a different checksum but identical content, so nothing was rebuilt. If the meaning changes, it runs the tests, builds, publishes, and rolls itself back if the site does not answer.
The Monza outline measures 5794 m against an official 5793. Zandvoort: 4253 against 4259. Grandstand markers are not placed by hand — the browser computes each position along the real length of the path.