a8e710f790
- Extend DailyClosePoint to include low, high, open (optional) - Update Databento source to extract OHLC data from ohlcv-1d schema - Update YFinance source to extract Low, High, Open from history - Modify backtest engine to use worst-case (low) price for margin call detection This ensures margin calls are evaluated at the day's worst price, not just the closing price, providing more realistic risk assessment.