dalsi pokusy

backend/tests/test_planning_dispatch_milp.py

@@ -2198,6 +2198,44 @@ class SitePowerCapTests(unittest.TestCase):
 class PlannerArbitrageImprovementsTests(unittest.TestCase):
     """Regrese: záporný buy, peak sell před sell<0, večerní export cap."""
 
+    def test_pre_neg_peak_ignores_earlier_day_in_horizon(self) -> None:
+        """Horizont přes půlnoc: peak je na dni záporného sell, ne včerejší večer."""
+        base = datetime(2026, 5, 22, 18, 0, tzinfo=timezone.utc)
+        slots = [
+            PlanningSlot(
+                interval_start=base,
+                buy_price=4.0,
+                sell_price=4.6,
+                pv_a_forecast_w=0,
+                pv_b_forecast_w=0,
+                load_baseline_w=1000,
+                ev1_connected=False,
+                ev2_connected=False,
+            ),
+            PlanningSlot(
+                interval_start=base + timedelta(hours=12),
+                buy_price=4.0,
+                sell_price=3.06,
+                pv_a_forecast_w=3000,
+                pv_b_forecast_w=0,
+                load_baseline_w=1000,
+                ev1_connected=False,
+                ev2_connected=False,
+            ),
+            PlanningSlot(
+                interval_start=base + timedelta(hours=12, minutes=45),
+                buy_price=0.5,
+                sell_price=-0.1,
+                pv_a_forecast_w=5000,
+                pv_b_forecast_w=0,
+                load_baseline_w=1000,
+                ev1_connected=False,
+                ev2_connected=False,
+            ),
+        ]
+        first_neg = 2
+        self.assertEqual(_pre_neg_peak_sell_idx(slots, first_neg), 1)
+
     def test_pre_neg_peak_idx_is_highest_positive_sell(self) -> None:
         base = datetime(2026, 5, 23, 4, 0, tzinfo=timezone.utc)
         slots = [