perf(api): serve stale sitemap XML while refreshing#968
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Summary
/sitemaps/:type/index.xmland/sitemaps/:type/:fileNamestale-while-revalidate/stale-if-error, and mark sitemap errorsno-storeContext
Recent prod failures on
/sitemaps/track/index.xmland track page sitemaps were cold dynamic DB reads getting canceled by Postgres hot-standby recovery conflicts (SQLSTATE 40001). The prior cache only covered page XML; index XML still had to rebuild on request. This keeps both index and page XML available from the last successful generation while refreshes happen asynchronously.Test Plan
go test ./api -run TestSitemap -count=1go test ./api -run ^$git diff --check