**ROOT CAUSE:** placeExitOrders() calculated position size using TP/SL prices instead of entry price
**Problem:**
- TP1 order size: 85 / TP1_price (00.746) = 2.914 SOL
- Actual position: 80 / entry_price (99.946) = 3.901 SOL
- TP1 should close: 3.901 * 75% = 2.926 SOL
- But it only closed: 2.914 SOL = 74.7% ❌ WRONG!
**Result:** TP1 closed ~25% instead of 75%, no runner left
**Fix:**
- Changed usdToBase() to use entryPrice for ALL size calculations
- Added entryPrice param to PlaceExitOrdersOptions interface
- Updated all API routes to pass entryPrice
**Testing:** Next trade will have correctly sized TP/SL orders
- New endpoint: /api/trading/scale-position to add to existing positions
- Calculates new average entry price after adding more size
- Cancels old TP/SL orders and places new ones at updated levels
- Telegram command: /scale [percent] (default 50%)
- Example: /scale 100 doubles your position
- Automatically adjusts Position Manager tracking with new values
- Cleaned up stale duplicate trade from database
