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

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

backend/app/strategy/exits.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import time
 from dataclasses import dataclass
+from typing import Any
 
 EXIT_MODE_FIXED = "fixed_usdt"
 EXIT_MODE_PREMIUM = "premium_multiple"
@@ -29,6 +30,62 @@ def resolve_exit_target(
     return float(net_profit_target), EXIT_MODE_FIXED
 
 
+def lock_trade_exit_target(
+    db: Any,
+    *,
+    group_id: str,
+    initial_premium: float,
+) -> float:
+    """
+    开仓成交后锁定本组成交出场目标到 groups/positions。
+    持仓期间盯盘与展示均用该值，不再跟随时价重算以损定仓/出场。
+    """
+    from ..config import get_settings
+    from ..sim.ledger import Ledger
+
+    s = get_settings()
+    ledger = Ledger(db)
+    exit_mode = ledger.get_setting_str("exit_mode", s.exit_mode) or EXIT_MODE_FIXED
+    net_target = float(
+        ledger.get_setting_float("net_profit_target", s.net_profit_target)
+        or s.net_profit_target
+    )
+    prem_mult = float(
+        ledger.get_setting_float("premium_exit_multiple", s.premium_exit_multiple)
+        or s.premium_exit_multiple
+    )
+    target, _mode = resolve_exit_target(
+        exit_mode=str(exit_mode),
+        net_profit_target=net_target,
+        premium_exit_multiple=prem_mult,
+        initial_premium=float(initial_premium or 0),
+    )
+    target = float(target)
+    db.execute(
+        "UPDATE groups SET exit_target_usdt=? WHERE group_id=?",
+        (target, group_id),
+    )
+    db.execute(
+        "UPDATE positions SET exit_target_usdt=? WHERE id=1",
+        (target,),
+    )
+    return target
+
+
+def read_locked_exit_target(pos: dict[str, Any] | None) -> float | None:
+    """持仓行上的锁定目标；无则 None（旧仓回退设置值）。"""
+    if not pos:
+        return None
+    v = pos.get("exit_target_usdt")
+    if v is None or v == "":
+        return None
+    try:
+        f = float(v)
+    except (TypeError, ValueError):
+        return None
+    return f if f > 0 else None
+
+
 def check_expiry_close(
     *,
     expiry_ms: int | None,
@@ -50,14 +107,19 @@ def check_exits(
     net_profit_target: float,
     premium_exit_multiple: float,
     initial_premium: float,
+    locked_exit_target: float | None = None,
 ) -> ExitDecision:
-    """净盈利（预估全平后）≥ 所选模式目标则全平。"""
-    target, mode = resolve_exit_target(
-        exit_mode=exit_mode,
-        net_profit_target=net_profit_target,
-        premium_exit_multiple=premium_exit_multiple,
-        initial_premium=initial_premium,
-    )
+    """净盈利（预估全平后）≥ 所选模式目标则全平。持仓锁定目标优先。"""
+    if locked_exit_target is not None and float(locked_exit_target) > 0:
+        target = float(locked_exit_target)
+        mode = EXIT_MODE_FIXED
+    else:
+        target, mode = resolve_exit_target(
+            exit_mode=exit_mode,
+            net_profit_target=net_profit_target,
+            premium_exit_multiple=premium_exit_multiple,
+            initial_premium=initial_premium,
+        )
     if target > 0 and net_pnl + 1e-9 >= target:
         reason = "premium_multiple" if mode == EXIT_MODE_PREMIUM else "fixed_usdt"
         return ExitDecision(True, reason, target)