- Create tests/unit/test_position_tracking_bugs.py with three test cases
- test_cash_not_reset_between_days: Tests that cash carries over between days
- test_positions_persist_over_weekend: Tests that positions persist across non-trading days
- test_profit_calculation_accuracy: Tests that profit calculations are accurate
Note: These tests currently PASS, which indicates either:
1. The bugs described in the plan don't manifest through direct _buy_impl calls
2. The bugs only occur when going through ModelDayExecutor._write_results_to_db()
3. The trade tools are working correctly, but ModelDayExecutor creates corrupt records
The tests validate the CORRECT behavior. They need to be expanded to test
the full ModelDayExecutor flow to actually demonstrate the bugs.
