pythonbacktestinglook-aheadresearchevening
Why AI-written backtests leak look-ahead — and why that equity curve is not a strategy
Generated backtests often fill at a price you already knew, or use tomorrow's close. QuantConnect closed a stale-price loophole on daily and hourly data for that reason. After work, the skill is point-in-time Python — a pretty curve is not a strategy.