fix: tighten max-hold session countdown

tests/unit/test_paper_trade_service.py

@@ -105,6 +105,50 @@ async def test_list_open_counts_post_entry_sessions_for_max_hold(session):
     assert row["sessions_remaining"] == 2
 
 
+async def test_list_open_exposes_past_max_hold_after_policy_is_shortened(session):
+    await svc.set_exit_policy(session, mode="time", hold_days=2)
+    ticker_id = await _seed(session, "OVERDUE", close=110.0)
+    trade = await svc.create_trade(
+        session,
+        1,
+        symbol="OVERDUE",
+        direction="long",
+        entry_price=100.0,
+        shares=10,
+        stop_loss=95.0,
+        target=120.0,
+    )
+    today = _today()
+    trade.opened_at = datetime.combine(
+        today - timedelta(days=5), datetime.min.time(), tzinfo=timezone.utc
+    )
+    session.add_all([
+        OHLCVRecord(
+            ticker_id=ticker_id,
+            date=today - timedelta(days=4),
+            open=101,
+            high=102,
+            low=100,
+            close=101,
+            volume=1,
+        ),
+        OHLCVRecord(
+            ticker_id=ticker_id,
+            date=today - timedelta(days=2),
+            open=102,
+            high=103,
+            low=101,
+            close=102,
+            volume=1,
+        ),
+    ])
+    await session.commit()
+
+    row = (await svc.list_trades(session, 1, status="open"))[0]
+    assert row["sessions_held"] == 3
+    assert row["sessions_remaining"] == -1
+
+
 async def test_list_open_omits_countdown_without_max_hold_policy(session):
     await svc.set_exit_policy(session, mode="trailing")
     await _seed(session, "NOHOLD", close=110.0)