FastAPI Request/Response Logging for AI Feature Attribution: Tracking Which Claude Call Cost Which Tenant

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FastAPI Request/Response Logging for AI Feature Attribution: Tracking Which Claude Call Cost Which Tenant When your SaaS starts charging tenants for AI features, you enter a new debugging hell. A customer emails: "Why did my bill jump $340 last Tuesday?" You grep your logs. You find 50 Claude API calls that day. But which endpoint triggered them? Which user?

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