fix: harden post-stop reentry lockdown

tests/unit/test_backtest_service.py

@@ -590,19 +590,47 @@ class TestSimulatePortfolio:
             None,
             "hold",
             30,
-            reentry_cooldown_days=5,
+            reentry_cooldown_sessions=5,
         )
 
         assert baseline is not None and baseline["trades"] == 2
         assert cooldown is not None and cooldown["trades"] == 1
         assert cooldown["skipped_cooldown"] == 1
-        assert cooldown["reentry_cooldown_days"] == 5
+        assert cooldown["reentry_cooldown_sessions"] == 5
+
+    def test_initial_stop_cooldown_unlocks_exactly_after_session_five(self):
+        closes = [100.0, 94.0, 96.0, 96.0, 96.0, 96.0, 97.0, 98.0]
+        prices = {"AAA": _sim_prices(self.ORD, closes)}
+        candidates = [
+            _sim_cand("AAA", self.ORD, entry=100.0, stop=95.0, target=120.0),
+            # Four completed sessions since the stop: still locked.
+            _sim_cand("AAA", self.ORD + 5, entry=96.0, stop=90.0, target=115.0),
+            # Five completed sessions since the stop: first permitted re-entry.
+            _sim_cand("AAA", self.ORD + 6, entry=97.0, stop=90.0, target=118.0),
+        ]
+
+        sim = bt._simulate_portfolio(
+            candidates,
+            prices,
+            None,
+            "hold",
+            30,
+            reentry_cooldown_sessions=5,
+            include_trades=True,
+        )
+
+        assert sim is not None
+        assert sim["trades"] == 2
+        assert sim["skipped_cooldown"] == 1
+        assert sim["trade_details"][1]["entry_date"] == date.fromordinal(
+            self.ORD + 6
+        ).isoformat()
 
     def test_production_monitor_applies_live_reentry_lockdown(self, monkeypatch):
         def fake_simulator(*_args, **kwargs):
             return {
                 "trades": 0,
-                "applied_reentry_lockdown": kwargs.get("reentry_cooldown_days", 0),
+                "applied_reentry_lockdown": kwargs.get("reentry_cooldown_sessions", 0),
             }
 
         monkeypatch.setattr(bt, "_simulate_portfolio", fake_simulator)