Clear trade history when resetting sim equity.

Deleting groups/fills/residuals and resetting strategy counters keeps funds reset a clean slate.

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

backend/app/sim/ledger.py

@@ -64,12 +64,42 @@ class Ledger:
                 pass
         return equity
 
+    def clear_trade_history(self) -> None:
+        """清空交易记录与持仓痕迹（组/成交/残留/账本流水），仓位置 flat。"""
+        now = int(time.time() * 1000)
+        with self.db._lock:
+            self.db._conn.execute("DELETE FROM fills")
+            self.db._conn.execute("DELETE FROM residual_options")
+            self.db._conn.execute("DELETE FROM groups")
+            self.db._conn.execute("DELETE FROM ledger_entries")
+            self.db._conn.execute(
+                """UPDATE positions SET
+                    group_id=NULL, perp_side=NULL, perp_qty_eth=0, perp_entry_px=NULL,
+                    option_inst_id=NULL, option_side=NULL, option_qty_eth=0,
+                    option_qty_contracts=0, option_entry_px=NULL, entry_index_px=NULL,
+                    initial_premium=0, exit_target_usdt=NULL, status='flat'
+                    WHERE id=1"""
+            )
+            self.db._conn.execute(
+                """UPDATE strategy_state SET
+                    rounds_done=0, window_key=NULL, rest_until_ms=NULL,
+                    last_error=NULL, phase=CASE WHEN running=1 THEN phase ELSE 'idle' END,
+                    updated_at_ms=?
+                    WHERE id=1""",
+                (now,),
+            )
+            self.db._conn.execute(
+                "DELETE FROM settings WHERE key=?", ("risk_last_k",)
+            )
+            self.db._conn.commit()
+
     def reset_equity(self, amount: float, *, note: str = "重置模拟资金") -> float:
-        """将权益与可用资金重置为 amount（reserved 清零）。须在无持仓时调用。"""
+        """将权益与可用资金重置为 amount（reserved 清零），并清空交易记录。须在无持仓时调用。"""
         now = int(time.time() * 1000)
         amt = float(amount)
         if amt < 0:
             raise ValueError("模拟资金不能为负")
+        self.clear_trade_history()
         with self.db._lock:
             self.db._conn.execute(
                 "UPDATE ledger_meta SET equity=?, available=?, reserved=0, updated_at_ms=? WHERE id=1",

backend/tests/test_reset_equity_clears_trades.py

@@ -0,0 +1,62 @@
+"""模拟资金重置时同步清空交易记录。"""
+
+from __future__ import annotations
+
+from app.models.db import Database
+from app.sim.ledger import Ledger
+
+
+def test_reset_equity_clears_trade_history(tmp_path, monkeypatch) -> None:
+    monkeypatch.setenv("MODE", "SIM")
+    db = Database(tmp_path / "reset.db")
+    with db._lock:
+        db._conn.execute(
+            """INSERT INTO groups(group_id, status, open_at_ms, close_at_ms, realized_pnl)
+               VALUES ('G1','closed',1,2,-5.0)"""
+        )
+        db._conn.execute(
+            """INSERT INTO fills(group_id, leg, action, side, inst_id, qty_eth,
+               fill_px, fee, slip, notional, ts_ms)
+               VALUES ('G1','perp','open','long','ETH-SWAP',1,2000,0.1,0,2000,1)"""
+        )
+        db._conn.execute(
+            """INSERT INTO residual_options(
+                 group_id, option_inst_id, option_side, option_qty_eth,
+                 option_entry_px, status, created_at_ms
+               ) VALUES ('G1','OPT','call',2,10,'pending',1)"""
+        )
+        db._conn.execute(
+            """INSERT INTO ledger_entries(group_id, kind, amount, balance_after, note, ts_ms)
+               VALUES ('G1','pnl',-5,9995,'t',2)"""
+        )
+        db._conn.execute(
+            """UPDATE strategy_state SET rounds_done=3, window_key='w', rest_until_ms=99
+               WHERE id=1"""
+        )
+        db._conn.commit()
+    db.set_setting("risk_last_k", "1.5")
+
+    Ledger(db).reset_equity(12000.0, note="test reset")
+
+    assert db.fetchone("SELECT COUNT(*) AS c FROM groups")["c"] == 0
+    assert db.fetchone("SELECT COUNT(*) AS c FROM fills")["c"] == 0
+    assert db.fetchone("SELECT COUNT(*) AS c FROM residual_options")["c"] == 0
+    entries = db.fetchall("SELECT kind, amount FROM ledger_entries")
+    assert len(entries) == 1
+    assert entries[0]["kind"] == "reset"
+    assert float(entries[0]["amount"]) == 12000.0
+    pos = db.fetchone("SELECT status, group_id FROM positions WHERE id=1")
+    assert pos["status"] == "flat"
+    assert pos["group_id"] is None
+    st = db.fetchone(
+        "SELECT rounds_done, window_key, rest_until_ms FROM strategy_state WHERE id=1"
+    )
+    assert int(st["rounds_done"]) == 0
+    assert st["window_key"] is None
+    assert st["rest_until_ms"] is None
+    assert db.get_setting("risk_last_k") is None
+    led = db.fetchone("SELECT equity, available, reserved FROM ledger_meta WHERE id=1")
+    assert float(led["equity"]) == 12000.0
+    assert float(led["available"]) == 12000.0
+    assert float(led["reserved"]) == 0.0
+    db.close()

frontend/src/pages/Settings.tsx

@@ -419,7 +419,7 @@ export default function SettingsPage() {
       setStratOk(
         isLive
           ? "策略参数已保存（实盘模式不改模拟资金）"
-          : "策略参数已保存（切换交易所/改模拟资金需无持仓；切换后会重连行情）",
+          : "策略参数已保存（改模拟资金会重置权益并清空交易记录，须无持仓；切换交易所后会重连行情）",
       );
     } catch (ex) {
       setErr(ex instanceof Error ? ex.message : String(ex));
@@ -1405,7 +1405,7 @@ export default function SettingsPage() {
                     <li>交易所：有持仓时不可切换。切换后套用该所合约并重连行情。</li>
                     {mode !== "LIVE" ? (
                       <li>
-                        模拟资金：仅 SIM 显示。保存后重置权益（须无持仓）。默认
+                        模拟资金：仅 SIM 显示。保存且金额变更后重置权益，并清空交易记录（须无持仓）。默认
                         10000。
                       </li>
                     ) : null}