权利金折 U 优先用开仓 budget_usdt，避免随币价浮动。

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

lib/options/options_db.py

@@ -148,6 +148,27 @@ def sum_open_premium_paid(conn: sqlite3.Connection, inst_id: str) -> float | Non
     return round(float(row["total"] or 0), 8)
 
 
+def sum_open_budget_usdt(conn: sqlite3.Connection, inst_id: str) -> float | None:
+    """同合约 open 腿开仓预算/兑换占用 USDT 合计(权利金折 U 展示用,不随币价变)."""
+    inst = (inst_id or "").strip()
+    if not inst:
+        return None
+    row = conn.execute(
+        """
+        SELECT SUM(budget_usdt) AS total, COUNT(*) AS n
+        FROM options_trades
+        WHERE inst_id = ? AND status = 'open' AND budget_usdt IS NOT NULL
+        """,
+        (inst,),
+    ).fetchone()
+    if not row or int(row["n"] or 0) < 1:
+        return None
+    try:
+        return round(float(row["total"] or 0), 4)
+    except (TypeError, ValueError):
+        return None
+
+
 def sum_open_sheets(conn: sqlite3.Connection, inst_id: str) -> int | None:
     """同合约所有 open 腿张数合计."""
     inst = (inst_id or "").strip()