BabakEA/ai-based-etl ? reverse-engineered prompt

Build me a small web app that helps with AI based ETL for documents and CSV data.

I want to upload a raw CSV and a target template CSV, then have the app analyze the differences, suggest the needed transformations, and show the result in a simple dashboard. It should also expose an API so I can send the files to an endpoint and get back the analysis as JSON. Use OpenAI for the intelligence part, and make it easy to enter an API key when running locally.

Please make it feel like a proof of concept that works end to end, with a clean local page on port 9009, some basic cost or token usage feedback if possible, and a simple interface that is easy to demo. If you need to, look up current docs online for whatever OpenAI or Python libraries make this easiest.