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A feed file is not a catalog until it passes the gate. This design quarantines a failed file and waits on a Step Functions task token before release. The large-file cutover is 100 MB, a design choice, not a service limit.
Assume 8 state transitions and 200 approved signups in a month: 1,600 transitions. Step Functions Standard includes 4,000 free transitions a month in US East (N. Virginia) at $0.000025 after that. The workflow marks READY only after the health check.
Delete is a late state. A legal hold stops the machine in HELD. One Scheduler invocation on the retention date sits inside the 14 million free EventBridge Scheduler invocations a month. The first write revokes access. It does not delete objects.
For a mid-market retailer (~2.4M SKUs, checkout p95 1.9s → 420ms), DynamoDB cart + Step Functions checkout + conditional inventory cuts held 2.1k checkout RPS — after a cache-as-inventory mistake oversold 380 units in 12 minutes.
For a .NET monolith (~220 endpoints, ~$28k/mo EC2), strangling 14 endpoints to Lambda cut p95 on those routes 1.4s → 210ms — an early LMI move on spiky traffic wasted ~$3.2k in idle capacity provider hours.
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