- CRITICAL BUG: Drift SDK's position.entryPrice RECALCULATES after partial closes
- After TP1, Drift returns COST BASIS of remaining position, NOT original entry
- Example: SHORT @ 38.52 → TP1 @ 70% → Drift shows entry 40.01 (runner's basis)
- Result: Breakeven SL set .50 ABOVE actual entry = guaranteed loss if triggered
Fix:
- Always use database trade.entryPrice for breakeven calculations
- Drift's position.entryPrice = current state (runner cost basis)
- Database entryPrice = original entry (authoritative for breakeven)
- Added logging to show both values for verification
Impact:
- Every TP1 → breakeven transition was using WRONG price
- Locking in losses instead of true breakeven protection
- Financial loss bug affecting every trade with TP1
Files:
- lib/trading/position-manager.ts: Line 513 - use trade.entryPrice not position.entryPrice
- .github/copilot-instructions.md: Added Common Pitfall #43, deprecated old #44
Incident: Nov 16, 02:47 CET - SHORT entry 38.52, breakeven SL set at 40.01
Position closed by ghost detection before SL could trigger (lucky)
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