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",