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I built a TradingView-style backtester with AI. Here is the stack and the build prompt. I wanted a replay and backtesting workflow I could customize, so I built one with AI coding tools. The starting stack: - TradingView Lightweight Charts for the chart UI - Public APIs for live data and Databento for futures history - Python/FastAPI and DuckDB for a local implementation - A replay engine that hides future candles and steps forward one bar at a time I put together a 4:30 tutorial showing the stack, my replay workflow, analytics and how I describe strategy rules to Claude. The full build prompt is in the video description: https://youtu.be/_J51OuwtPWw