diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 656f23a..891cb73 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -1874,6 +1874,38 @@ trade.realizedPnL += actualRealizedPnL  // NOT: result.realizedPnL from SDK
     - **Drift documentation:** Account leverage must be set in UI, is persistent on-chain setting
     - **Lesson:** On-chain account settings cannot be changed via API - always verify account state matches bot assumptions before production trading
 
+44. **Breakeven SL using database entry price instead of Drift's actual entry (Fixed Nov 16, 2025):**
+    - **Symptom:** After TP1 hits, SL moved to "breakeven" but at wrong price - SHORT with $139.07 entry gets SL at $139.18 ($0.11 loss if hit)
+    - **Root Cause:** Position Manager used `trade.entryPrice` from database, which can differ from Drift's actual fill price by $0.10-0.15
+    - **Price discrepancy sources:**
+      * Database stores initial expected price
+      * Drift fills at market price (slippage)
+      * Orphaned position restorations use stale database price (see Common Pitfall #33)
+      * Oracle price delays during execution
+    - **Real incident (Nov 16, 01:37 CET):**
+      * User screenshot: Entry $139.07, SL $139.18, Current $138.58
+      * Database: entryPrice=$139.18291
+      * Drift UI: Entry Price=$139.07  
+      * Discrepancy: $0.11 (would lose money if SL hit on "breakeven")
+    - **Impact:** Breakeven SL not truly breakeven - gives back profit or locks in unnecessary loss
+    - **Fix:** Query Drift SDK for actual entry price when setting breakeven SL
+    ```typescript
+    // In lib/trading/position-manager.ts (line ~511):
+    // BEFORE:
+    trade.stopLossPrice = trade.entryPrice // Uses database value
+    
+    // AFTER:
+    const actualEntryPrice = position.entryPrice || trade.entryPrice
+    console.log(`📊 Breakeven calculation: DB entry=$${trade.entryPrice.toFixed(4)}, Drift entry=$${actualEntryPrice.toFixed(4)}`)
+    trade.stopLossPrice = actualEntryPrice // Uses Drift's on-chain calculated price
+    ```
+    - **Drift SDK accuracy:** `position.entryPrice` calculated from on-chain data (quoteAssetAmount / baseAssetAmount) = authoritative
+    - **Fallback:** If position.entryPrice unavailable, falls back to database entry (rare edge case)
+    - **Logging:** Now shows both DB and Drift entry prices for verification
+    - **Related issues:** Common Pitfall #33 (orphaned position restoration with wrong entry)
+    - **Git commit:** 528a0f4 "fix: Use Drift's actual entry price for breakeven SL"
+    - **Lesson:** For critical price calculations (breakeven, TP, SL), always prefer on-chain data over cached database values
+
 ## File Conventions
 
 - **API routes:** `app/api/[feature]/[action]/route.ts` (Next.js 15 App Router)