us-east-1

October 2025: a DNS automation script in Virginia decides the DynamoDB endpoint no longer sparks joy and quietly deletes the record. The database is fine, nobody can find it. Every lookup hangs and every SDK retries like a pigeon pecking a dead feeder. Also, your worker fleet is enthusiastically DDoSing the void. AWS says the fix is "in progress." The Job: You can't patch ten thousand SDKs and you can't touch AWS's side of the fence, so ride out the registry's dark window with error and tail latency inside the SLA, storm and all. Contain it while the cloud finds its keys.

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