Set is_activated_on_begins to True in tax update task

tests/test_models/test_reservation_unit_pricing_updates.py

@@ -35,7 +35,9 @@ def test_reservation_unit__update_pricings__tax_percentage__no_future_pricing():
     future_pricings = ReservationUnitPricing.objects.filter(begins=TAX_CHANGE_DATE)
     assert future_pricings.count() == 1  # New pricing should be created for the change date
 
-    assert future_pricings.first().tax_percentage.value == FUTURE_TAX
+    future_pricing = future_pricings.first()
+    assert future_pricing.is_activated_on_begins is True
+    assert future_pricing.tax_percentage.value == FUTURE_TAX
     assert active_pricing.tax_percentage.value == CURRENT_TAX  # Active pricing should not be changed
 
     assert SentryLogger.log_message.call_count == 1

tilavarauspalvelu/tasks.py

@@ -317,6 +317,7 @@ def update_reservation_unit_pricings_tax_percentage(
                 lowest_price=pricing.lowest_price,
                 highest_price=pricing.highest_price,
                 reservation_unit=pricing.reservation_unit,
+                is_activated_on_begins=True,
             ).save()
 
     # Log any unhandled future pricings