Fix hedge option PnL match by parsing opened_at as Asia/Shanghai.

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

tests/test_hedge_exchange_pnl.py

@@ -6,6 +6,7 @@ import unittest
 
 from lib.hedge_plan.hedge_plan_db import get_plan, init_hedge_plan_tables, insert_leg, insert_plan
 from lib.hedge_plan.hedge_plan_settle_lib import (
+    _parse_opened_ms,
     backfill_hedge_option_legs_realized_pnl,
     resolve_option_leg_realized_pnl,
 )
@@ -32,6 +33,30 @@ class HedgeExchangePnlTest(unittest.TestCase):
         self.assertEqual(src, "exchange")
         self.assertEqual(pnl, 12.0)
 
+    def test_opened_at_beijing_wall_clock_not_utc(self):
+        # 北京 09:19 开仓 → UTC 01:19; 到期结算北京 16:00:31 = UTC 08:00:31
+        open_ms = _parse_opened_ms("2026-07-20 09:19:30")
+        self.assertEqual(open_ms, 1784510370000)
+        leg = {
+            "inst_id": "ETH-USD_UM-260720-1870-C",
+            "opened_at": "2026-07-20 09:19:30",
+            "premium": 6.9,
+        }
+        hist = [
+            {
+                "instId": "ETH-USD_UM-260720-1870-C",
+                "uTime": "1784534431512",
+                "realizedPnl": "-7.1812815",
+                "pnl": "-6.9",
+                "type": "2",
+            }
+        ]
+        pnl, src = resolve_option_leg_realized_pnl(
+            leg=leg, hist_rows=hist, fallback=-6.9
+        )
+        self.assertEqual(src, "exchange")
+        self.assertAlmostEqual(pnl, -7.1813, places=4)
+
     def test_backfill_updates_plan_total(self):
         conn = sqlite3.connect(":memory:")
         conn.row_factory = sqlite3.Row