Add dual exit modes: fixed USDT or premium multiple.

Net PnL (after estimated close fees) drives auto close; Plan/Settings expose the choice.

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

backend/app/api/settings.py

@@ -15,6 +15,9 @@ router = APIRouter(prefix="/api/settings", tags=["settings"])
 KEYS = (
     "fee_rate",
     "exit_move_pct",
+    "exit_mode",
+    "net_profit_target",
+    "premium_exit_multiple",
     "rest_seconds",
     "initial_equity",
     "leverage",
@@ -29,6 +32,9 @@ KEYS = (
 class StrategySettingsBody(BaseModel):
     fee_rate: float | None = Field(default=None, ge=0, le=0.05)
     exit_move_pct: float | None = Field(default=None, ge=0.1, le=50)
+    exit_mode: str | None = Field(default=None, pattern="^(fixed_usdt|premium_multiple)$")
+    net_profit_target: float | None = Field(default=None, ge=0.1, le=1_000_000)
+    premium_exit_multiple: float | None = Field(default=None, ge=0.1, le=100)
     rest_seconds: int | None = Field(default=None, ge=0, le=3600)
     initial_equity: float | None = Field(default=None, ge=1000)
     leverage: float | None = Field(default=None, ge=1, le=125)
@@ -42,11 +48,23 @@ class StrategySettingsBody(BaseModel):
 def _read_settings() -> dict:
     db = get_db()
     s = get_settings()
+    mode = str(db.get_setting("exit_mode", s.exit_mode) or s.exit_mode)
+    if mode not in ("fixed_usdt", "premium_multiple"):
+        mode = "fixed_usdt"
     return {
         "fee_rate": float(db.get_setting("fee_rate", str(s.fee_rate)) or s.fee_rate),
         "exit_move_pct": float(
             db.get_setting("exit_move_pct", str(s.exit_move_pct)) or s.exit_move_pct
         ),
+        "exit_mode": mode,
+        "net_profit_target": float(
+            db.get_setting("net_profit_target", str(s.net_profit_target))
+            or s.net_profit_target
+        ),
+        "premium_exit_multiple": float(
+            db.get_setting("premium_exit_multiple", str(s.premium_exit_multiple))
+            or s.premium_exit_multiple
+        ),
         "rest_seconds": int(
             float(db.get_setting("rest_seconds", str(s.rest_seconds)) or s.rest_seconds)
         ),