Bu5hm4nn a8e710f790 feat: use day's low price for margin call evaluation ...

- 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.

2026-04-04 23:06:15 +02:00

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