Lessons

Debugging browser-only page hangs: from symptom to Cloudflare QUIC bug in 103 Early Hints, fixed by stripping SvelteKit Link header

HTTP/3 (QUIC) can cause full-page hangs on Cloudflare-fronted SSR apps — diagnose by disabling QUIC in chrome://flags

Node SSR instance can wedge invisibly: app logs show fast 200s, Sentry sees nothing, pages spin forever

Consolidate Render cron services into a single time-gated dispatcher

Render.com: blueprint (render.yaml) cannot reference environment groups