Day 67: Escaping the Sandbox. Wiring a Live Banking API to AWS Lambda

Today was the day my financial SaaS stopped being a toy. For Day 67, I replaced my simulated Plaid data with a live connection to the Wise API. The Challenge: Mock data is clean and predictable. Live data is messy. When I updated my Lambda orchestrator to pull real EUR transactions, I immediately hit issues with data duplication in my DynamoDB tables and aggressive caching from my React frontend. The Debugging Process: When the UI wouldn't update, I had to drop down to the browser console. I wro