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…lity - Fear & Greed: alternative.me -> CMC F&G -> composite from market data - Coins: CoinMarketCap -> CoinGecko fallback (same data shape) - Markets: CoinGecko -> overview built from cached CMC coins - Last-good data is kept (no TTL) and persisted to server/.cache for warm starts - Retry with backoff for CoinGecko/CMC/alternative.me (no retry on 4xx) - /api/cmc/live serves cached list instead of 502 when live update fails - Rate limiter now only applies to /api routes, not static assets - /api/health reports per-dataset availability, source, age and last error - CSP: unsafe-inline scripts only for legacy public/ frontend - Fix pre-existing lint errors in client (usePolling, CoinDetail, main.tsx) - Add vitest suite (35 tests) and GitHub Actions CI (typecheck, tests, lint, build) Co-authored-by: Sebastian <devbadya@users.noreply.github.com>
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Problem
Markets, Coins und Fear & Greed fielen zeitweise aus: Wenn eine externe API (CoinGecko, CoinMarketCap, Alternative.me) nicht antwortete, lief der Cache-TTL ab und die Endpoints lieferten 503. Nach jedem Neustart/Deploy war der Cache zudem komplett leer.
Lösung
Automatische API-Fallbacks:
Letzte gute Daten bleiben erhalten:
server/.cache/: nach Neustart/Deploy sind sofort Daten da (Warm-Start).Härtung (Quick Wins):
/api-Routen, nicht mehr auf statische Assets./api/healthzeigt pro Datensatz: verfügbar, Quelle, Alter, letzter Fehler (ok/degraded/starting).unsafe-inline-Scripts nur noch für das Legacy-Frontend (public/), nicht für den React-Build.Tests & CI:
usePolling,CoinDetail,main.tsx),npm auditauf 0 Findings.Verifiziert
/api/healthweist Quelle und letzten Fehler pro Datensatz aus.