Snow Summary share card

PNG of a mountain's Snow Summary laid out to share: a 4:5 post or a 9:16 story, in the map reel's type over the resort's hero photo. It prints the totals for the past 10 days, 48H, 24H, the next 7 days and the next 14 days, the past ten days and the coming fortnight as bars in the snow map's key, and the resort's link (snowsure.ai/resorts/{slug}). The card the My Mountains share button shares, on the website and in the app. An unknown resort is a 404.

Auth: none.

Caching: Cache-Control: public, max-age=1800, s-maxage=1800, stale-while-revalidate=3600, no-transform. The resort snapshot it draws refreshes hourly; half an hour keeps a snow day current. Never immutable, so browsers, social scrapers and the CDN fetch a fresh render once the window passes. A changing query parameter (e.g. &d=2026-09-15) still forces a fresh render; unknown parameters are ignored.