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d387d567c5
equity was computed as cash + unrealized_pnl where unrealized_pnl =
(close - entry) × shares. Since cash already had entry cost subtracted,
this double-counted the cost basis:
buggy: equity = (initial - entry×shares) + (close - entry)×shares
= initial + close×shares − 2×entry×shares ← WRONG
correct: equity = cash + market_value
= (initial - entry×shares) + close×shares
= initial + (close − entry)×shares ← RIGHT
This caused drawdown to spike to ~73% the instant a position opened
(e.g. TSLA $330 × 222 shares → equity appeared to drop from 100k to
27k), falsely triggering the kill switch at 25% and blocking all
subsequent entries.
Before fix: 3 trades, +0.08% return, 39.2% max drawdown (fake)
After fix: 10 trades, -2.63% return, 4.24% max drawdown (real)
Also: when bar data is missing, positions now use entry_price as
fallback market value instead of treating the position as worthless.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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