next fix

backend/tests/test_planning_dispatch_milp.py

@@ -519,6 +519,94 @@ class PlanningDispatchMilpTests(unittest.TestCase):
         # A zároveň nesmí být baterie ve výboji (dump musí proběhnout předtím).
         self.assertGreaterEqual(results[1].battery_setpoint_w, 0)
 
+    def test_anchor_hits_floor_before_first_negative_sell(self) -> None:
+        """
+        Pokud se v horizontu objeví první sell<0 a současně existuje planner floor (relaxace),
+        solver má skončit už v předchozím slotu u planner floor (cca 5 %), ne na ~15 %.
+        """
+        base = datetime(2026, 4, 3, 6, 0, tzinfo=timezone.utc)
+        # Slot 0-1: sell >= 0; slot 2: první sell < 0; slot 3: extrémně záporný buy (motivace k bufferu).
+        slots = [
+            PlanningSlot(
+                interval_start=base,
+                buy_price=3.0,
+                sell_price=1.0,
+                pv_a_forecast_w=0,
+                pv_b_forecast_w=0,
+                load_baseline_w=0,
+                ev1_connected=False,
+                ev2_connected=False,
+                allow_charge=True,
+                allow_discharge_export=True,
+            ),
+            PlanningSlot(
+                interval_start=base + timedelta(minutes=15),
+                buy_price=3.0,
+                sell_price=0.5,
+                pv_a_forecast_w=0,
+                pv_b_forecast_w=0,
+                load_baseline_w=0,
+                ev1_connected=False,
+                ev2_connected=False,
+                allow_charge=True,
+                allow_discharge_export=True,
+            ),
+            PlanningSlot(
+                interval_start=base + timedelta(minutes=30),
+                buy_price=3.0,
+                sell_price=-0.2,
+                pv_a_forecast_w=0,
+                pv_b_forecast_w=0,
+                load_baseline_w=0,
+                ev1_connected=False,
+                ev2_connected=False,
+                allow_charge=True,
+                allow_discharge_export=True,
+            ),
+            PlanningSlot(
+                interval_start=base + timedelta(minutes=45),
+                buy_price=-20.0,
+                sell_price=-1.0,
+                pv_a_forecast_w=0,
+                pv_b_forecast_w=0,
+                load_baseline_w=0,
+                ev1_connected=False,
+                ev2_connected=False,
+                allow_charge=True,
+                allow_discharge_export=True,
+            ),
+        ]
+        battery = _battery(uc_wh=20_000.0, min_pct=10.0, arb_pct=20.0)
+        battery.planner_extreme_buy_threshold_czk_kwh = -2.0
+        battery.planner_discharge_floor_percent = 5.0
+        battery.max_charge_power_w = 50_000
+        battery.max_discharge_power_w = 50_000
+        hp = SimpleNamespace(rated_heating_power_w=0, tuv_min_temp_c=45.0, tuv_target_temp_c=55.0)
+        grid = SimpleNamespace(max_import_power_w=50_000, max_export_power_w=50_000)
+        vehicles = [
+            SimpleNamespace(max_charge_power_w=0, battery_capacity_kwh=1.0, default_target_soc_pct=80.0),
+            SimpleNamespace(max_charge_power_w=0, battery_capacity_kwh=1.0, default_target_soc_pct=80.0),
+        ]
+        soc0 = 0.9 * battery.usable_capacity_wh
+        results, _ms = solve_dispatch(
+            slots,
+            battery,
+            hp,
+            grid,
+            [None, None],
+            vehicles,
+            soc0,
+            50.0,
+            tuv_delta_stats=None,
+            operating_mode="AUTO",
+        )
+        # Slot index 1 je poslední před prvním sell<0 (index 2).
+        self.assertLessEqual(
+            results[1].battery_soc_target,
+            6.0,
+            msg="anchor should drive SoC close to planner floor before first negative sell",
+        )
+
     def test_grid_import_soft_cap_penalizes_breaker_overdraw(self) -> None:
         """
         Soft cap: solver může nominálně překročit breaker, ale jen pokud se to vyplatí.