Add OKX trading-account USDC auto-swap and lock exit target while in position.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/api/sim.py

@@ -115,6 +115,13 @@ async def sim_open_group(
     if not rs.ok:
         raise HTTPException(status_code=409, detail=rs.detail)
 
+    try:
+        from ..strategy.auto_usdc import ensure_okx_trading_usdc
+
+        ensure_okx_trading_usdc(db)
+    except Exception:
+        pass
+
     try:
         from ..strategy.open_capacity import assess_open_capacity