Cache Me If You Can

A storefront cached its 10 core product pages for 100 seconds each. Mathematically tidy, architecturally lethal. Pages that warm up together expire together, so every 100 seconds the cache blinks out at once and normal traffic turns into a synchronized mob charging the database. The Job: Keep the origin and its connection pool alive through the repeated expiries, without error or latency spiking each time the cache goes cold. Survive the every-100-second thundering herd your own cache keeps summoning.

Free to play, no account needed. A deterministic engine grades your design against this scenario's SLA - error rate, latency, and cost.