diff --git a/backend/commerce/integrations/moysklad.py b/backend/commerce/integrations/moysklad.py
index abcb1e05..cef1a681 100644
--- a/backend/commerce/integrations/moysklad.py
+++ b/backend/commerce/integrations/moysklad.py
@@ -136,7 +136,11 @@ class MoySkladClient:
                     "MoySklad GET transient failure %s; retrying in %.1f seconds",
                     type(exc).__name__,
                     retry_delay,
-                    extra={**log_context, "retry_in_seconds": retry_delay},
+                    extra={
+                        **log_context,
+                        "event": "commerce.moysklad.get_retry",
+                        "retry_in_seconds": retry_delay,
+                    },
                 )
                 time.sleep(retry_delay)
             except httpx.HTTPStatusError as exc:
@@ -149,6 +153,7 @@ class MoySkladClient:
                         "MoySklad HTTP %s; retrying GET",
                         exc.response.status_code,
                         extra={
+                            "event": "commerce.moysklad.get_retry",
                             "endpoint": endpoint,
                             "attempt": attempt,
                             "request_offset": (params or {}).get("offset"),
diff --git a/backend/tests/api/v1/communications/test_change_role_improved.py b/backend/tests/api/v1/communications/test_change_role_improved.py
index 094b3e9d..a5f3b292 100644
--- a/backend/tests/api/v1/communications/test_change_role_improved.py
+++ b/backend/tests/api/v1/communications/test_change_role_improved.py
@@ -8,7 +8,7 @@
 """
 
 import pytest
-from communications.models import Chat, ChatMembership, Message
+from communications.models import Chat, ChatMembership
 from django.contrib.auth import get_user_model
 from rest_framework import status
 from rest_framework.test import APIClient
@@ -19,7 +19,7 @@ pytestmark = pytest.mark.django_db
 
 class TestChangeRoleImproved:
     """Улучшенные тесты изменения ролей с проверкой через GET запрос"""
-    
+
     @pytest.fixture
     def owner(self, db):
         return User.objects.create_user(
@@ -28,9 +28,10 @@ class TestChangeRoleImproved:
             first_name="Owner",
             last_name="Test",
             phone_number="+79001234567",
+            is_active=True,
             send_activation_email=False,
         )
-    
+
     @pytest.fixture
     def member_user(self, db):
         return User.objects.create_user(
@@ -39,94 +40,84 @@ class TestChangeRoleImproved:
             first_name="Member",
             last_name="Test",
             phone_number="+79001234568",
+            is_active=True,
             send_activation_email=False,
         )
-    
+
     @pytest.fixture
     def test_chat(self, owner, member_user):
-        chat = Chat.objects.create(
-            type="group",
-            name="Test Chat",
-            created_by=owner
-        )
+        chat = Chat.objects.create(type="group", name="Test Chat", created_by=owner)
         chat.participants.add(owner, member_user)
-        
+
         ChatMembership.objects.create(
-            chat=chat,
-            user=member_user,
-            role='member',
-            invited_by=owner
+            chat=chat, user=member_user, role="member", invited_by=owner
         )
-        
+
         return chat
-    
+
     @pytest.fixture
     def owner_client(self, owner):
         client = APIClient()
         client.force_authenticate(user=owner)
         return client
-    
+
     def test_change_role_and_verify_via_api(self, owner_client, test_chat, member_user):
         """
         Тест: изменить роль, дождаться ответа, проверить через GET
         """
         # Шаг 1: Изменяем роль через POST
         change_url = f"/api/v1/communications/chats/{test_chat.id}/change-role/"
-        response = owner_client.post(change_url, {
-            'user_id': member_user.id,
-            'role': 'admin'
-        })
-        
+        response = owner_client.post(
+            change_url, {"user_id": member_user.id, "role": "admin"}
+        )
+
         # Шаг 2: Проверяем успешный ответ
         assert response.status_code == status.HTTP_200_OK
         data = response.json()
-        assert data['ok'] is True
-        assert data['membership']['role'] == 'admin'
-        
+        assert data["ok"] is True
+        assert data["membership"]["role"] == "admin"
+
         # Шаг 3: Получаем чат через GET и проверяем роль
         chat_url = f"/api/v1/communications/chats/{test_chat.id}/"
         get_response = owner_client.get(chat_url)
-        
+
         assert get_response.status_code == status.HTTP_200_OK
         chat_data = get_response.json()
-        
+
         # Шаг 4: Находим участника и проверяем роль
         member_membership = next(
-            (m for m in chat_data['memberships'] if m['user'] == member_user.id),
-            None
+            (m for m in chat_data["memberships"] if m["user"] == member_user.id), None
         )
-        
+
         assert member_membership is not None, "Участник не найден"
-        assert member_membership['role'] == 'admin'
-        assert member_membership['can_send_messages'] is True
-        assert member_membership['can_add_members'] is True
-    
+        assert member_membership["role"] == "admin"
+        assert member_membership["can_send_messages"] is True
+        assert member_membership["can_add_members"] is True
+
     def test_member_to_guest_role_change(self, owner_client, test_chat, member_user):
         """
         Тест: изменение member → guest с проверкой через API
         """
         # Шаг 1: Изменяем роль
         change_url = f"/api/v1/communications/chats/{test_chat.id}/change-role/"
-        response = owner_client.post(change_url, {
-            'user_id': member_user.id,
-            'role': 'guest'
-        })
-        
+        response = owner_client.post(
+            change_url, {"user_id": member_user.id, "role": "guest"}
+        )
+
         # Шаг 2: Проверяем ответ
         assert response.status_code == status.HTTP_200_OK
-        
+
         # Шаг 3: Проверяем через GET
         chat_url = f"/api/v1/communications/chats/{test_chat.id}/"
         get_response = owner_client.get(chat_url)
-        
+
         chat_data = get_response.json()
         member_membership = next(
-            (m for m in chat_data['memberships'] if m['user'] == member_user.id),
-            None
+            (m for m in chat_data["memberships"] if m["user"] == member_user.id), None
         )
-        
+
         # Шаг 4: Проверяем что стал гостем (только чтение)
-        assert member_membership['role'] == 'guest'
-        assert member_membership['can_send_messages'] is False
-        assert member_membership['can_add_members'] is False
-        assert member_membership['can_remove_members'] is False
+        assert member_membership["role"] == "guest"
+        assert member_membership["can_send_messages"] is False
+        assert member_membership["can_add_members"] is False
+        assert member_membership["can_remove_members"] is False
diff --git a/backend/tests/api/v1/employees/test_department_calendar.py b/backend/tests/api/v1/employees/test_department_calendar.py
index 40c0b5c6..079844cf 100644
--- a/backend/tests/api/v1/employees/test_department_calendar.py
+++ b/backend/tests/api/v1/employees/test_department_calendar.py
@@ -206,9 +206,7 @@ def test_department_calendar_event_permissions_for_non_member_and_member(
     )
     assert forbidden_response.status_code == status.HTTP_403_FORBIDDEN
 
-    forbidden_delete = api_client.delete(
-        f"/api/v1/schedule/events/{member_event.id}/"
-    )
+    forbidden_delete = api_client.delete(f"/api/v1/schedule/events/{member_event.id}/")
     assert forbidden_delete.status_code == status.HTTP_403_FORBIDDEN
 
 
@@ -293,9 +291,7 @@ def test_department_calendar_participants_include_avatar_and_email(
         "calendar_id"
     ]
 
-    response = api_client.get(
-        f"/api/v1/schedule/calendars/{calendar_id}/participants/"
-    )
+    response = api_client.get(f"/api/v1/schedule/calendars/{calendar_id}/participants/")
 
     assert response.status_code == status.HTTP_200_OK
     assert len(response.data) == 1
@@ -307,7 +303,7 @@ def test_department_calendar_participants_include_avatar_and_email(
     assert participant["user"]["last_name"] == "User"
 
 
-def test_department_calendar_occurrences_allow_outsider_but_keep_permissions(
+def test_department_calendar_occurrences_hide_events_from_outsider(
     api_client: APIClient,
 ):
     head = make_user("head@example.com")
@@ -344,9 +340,19 @@ def test_department_calendar_occurrences_allow_outsider_but_keep_permissions(
         },
     )
 
+    assert response.status_code == status.HTTP_200_OK
+    assert response.data == []
+
+    api_client.force_authenticate(user=member)
+    response = api_client.get(
+        "/api/v1/schedule/events/occurrences/",
+        {
+            "calendar": calendar_id,
+            "start": (start - timedelta(minutes=5)).isoformat(),
+            "end": (start + timedelta(hours=2)).isoformat(),
+        },
+    )
+
     assert response.status_code == status.HTTP_200_OK
     assert len(response.data) == 1
-    occurrence = response.data[0]
-    assert occurrence["event_id"] == member_event.id
-    assert occurrence["can_edit"] is False
-    assert occurrence["can_delete"] is False
+    assert response.data[0]["event_id"] == member_event.id
diff --git a/backend/tests/api/v1/procurement/test_equipment.py b/backend/tests/api/v1/procurement/test_equipment.py
index 5b5c9e60..2f7f4acd 100644
--- a/backend/tests/api/v1/procurement/test_equipment.py
+++ b/backend/tests/api/v1/procurement/test_equipment.py
@@ -28,10 +28,7 @@ def api_client():
 @pytest.fixture
 def department(db):
     """Тестовый отдел."""
-    return Department.objects.create(
-        name="IT отдел",
-        description="Отдел IT"
-    )
+    return Department.objects.create(name="IT отдел", description="Отдел IT")
 
 
 @pytest.fixture
@@ -46,9 +43,7 @@ def user(db, department):
         send_activation_email=False,
     )
     EmployeeDepartment.objects.create(
-        employee=user,
-        department=department,
-        is_active=True
+        employee=user, department=department, is_active=True
     )
     return user
 
@@ -71,9 +66,7 @@ def staff_user(db):
 def category(db):
     """Категория оборудования."""
     return EquipmentCategory.objects.create(
-        name="Ноутбуки",
-        description="Портативные компьютеры",
-        icon="bi-laptop"
+        name="Ноутбуки", description="Портативные компьютеры", icon="bi-laptop"
     )
 
 
@@ -106,33 +99,29 @@ class TestEquipmentList:
 
     def test_list_unauthorized(self, api_client):
         """Неавторизованный доступ запрещен."""
-        url = reverse('api:v1:procurement:equipment-list')
+        url = reverse("api:v1:procurement:equipment-list")
         response = api_client.get(url)
         assert response.status_code == status.HTTP_401_UNAUTHORIZED
 
-    def test_list_equipment(
-        self, api_client, user, equipment
-    ):
+    def test_list_equipment(self, api_client, user, equipment):
         """Получение списка оборудования."""
         api_client.force_authenticate(user=user)
-        url = reverse('api:v1:procurement:equipment-list')
+        url = reverse("api:v1:procurement:equipment-list")
         response = api_client.get(url)
-        
+
         assert response.status_code == status.HTTP_200_OK
-        results = response.data['results']
+        results = response.data["results"]
         assert len(results) >= 1
-        
+
         # Проверяем структуру
         item = results[0]
-        assert 'inventory_number' in item
-        assert 'name' in item
-        assert 'status' in item
-        assert 'category_name' in item
-        assert 'department_name' in item
+        assert "inventory_number" in item
+        assert "name" in item
+        assert "status" in item
+        assert "category_name" in item
+        assert "department_name" in item
 
-    def test_filter_by_status(
-        self, api_client, user, category, department, equipment
-    ):
+    def test_filter_by_status(self, api_client, user, category, department, equipment):
         """Фильтр по статусу."""
         # Создаем оборудование с разными статусами
         Equipment.objects.create(
@@ -144,23 +133,22 @@ class TestEquipmentList:
             purchase_date=date.today(),
             purchase_cost=Decimal("20000.00"),
         )
-        
+
         api_client.force_authenticate(user=user)
-        url = reverse('api:v1:procurement:equipment-list')
-        
+        url = reverse("api:v1:procurement:equipment-list")
+
         # Фильтр AVAILABLE
-        response = api_client.get(url, {'status': EquipmentStatus.AVAILABLE})
+        response = api_client.get(url, {"status": EquipmentStatus.AVAILABLE})
         assert response.status_code == status.HTTP_200_OK
-        results = response.data['results']
-        assert all(r['status'] == EquipmentStatus.AVAILABLE for r in results)
+        results = response.data["results"]
+        assert all(r["status"] == EquipmentStatus.AVAILABLE for r in results)
 
     def test_filter_by_department(
         self, api_client, user, db, category, department, equipment
     ):
         """Фильтр по отделу."""
         other_dept = Department.objects.create(
-            name="HR отдел",
-            description="Другой отдел"
+            name="HR отдел", description="Другой отдел"
         )
         Equipment.objects.create(
             name="Принтер",
@@ -171,26 +159,24 @@ class TestEquipmentList:
             purchase_date=date.today(),
             purchase_cost=Decimal("15000.00"),
         )
-        
-        api_client.force_authenticate(user=user)
-        url = reverse('api:v1:procurement:equipment-list')
-        
-        response = api_client.get(url, {'department': department.id})
-        assert response.status_code == status.HTTP_200_OK
-        results = response.data['results']
-        # Все должны быть из нужного отдела
-        assert all(r['department'] == department.id for r in results)
 
-    def test_search_equipment(
-        self, api_client, user, equipment
-    ):
+        api_client.force_authenticate(user=user)
+        url = reverse("api:v1:procurement:equipment-list")
+
+        response = api_client.get(url, {"department": department.id})
+        assert response.status_code == status.HTTP_200_OK
+        results = response.data["results"]
+        # Все должны быть из нужного отдела
+        assert all(r["department"] == department.id for r in results)
+
+    def test_search_equipment(self, api_client, user, equipment):
         """Поиск оборудования."""
         api_client.force_authenticate(user=user)
-        url = reverse('api:v1:procurement:equipment-list')
-        
-        response = api_client.get(url, {'search': 'latitude'})
+        url = reverse("api:v1:procurement:equipment-list")
+
+        response = api_client.get(url, {"search": "latitude"})
         assert response.status_code == status.HTTP_200_OK
-        assert len(response.data['results']) >= 1
+        assert len(response.data["results"]) >= 1
 
 
 # ==============================================================================
@@ -206,44 +192,44 @@ class TestEquipmentCreate:
     ):
         """Создание оборудования staff пользователем."""
         api_client.force_authenticate(user=staff_user)
-        url = reverse('api:v1:procurement:equipment-list')
-        
+        url = reverse("api:v1:procurement:equipment-list")
+
         data = {
-            'name': 'Монитор LG 27"',
-            'inventory_number': 'INV-2026-100',
-            'serial_number': 'LG987654321',
-            'category': category.id,
-            'status': EquipmentStatus.AVAILABLE,
-            'department': department.id,
-            'location': 'Склад',
-            'purchase_date': '2026-02-01',
-            'warranty_until': '2029-02-01',
-            'purchase_cost': '25000.00',
-            'notes': 'Для офиса',
+            "name": 'Монитор LG 27"',
+            "inventory_number": "INV-2026-100",
+            "serial_number": "LG987654321",
+            "category": category.id,
+            "status": EquipmentStatus.AVAILABLE,
+            "department": department.id,
+            "location": "Склад",
+            "purchase_date": "2026-02-01",
+            "warranty_until": "2029-02-01",
+            "purchase_cost": "25000.00",
+            "notes": "Для офиса",
         }
-        
-        response = api_client.post(url, data, format='json')
+
+        response = api_client.post(url, data, format="json")
         assert response.status_code == status.HTTP_201_CREATED
-        assert response.data['name'] == 'Монитор LG 27"'
-        assert response.data['inventory_number'].startswith('INV-')
+        assert response.data["name"] == 'Монитор LG 27"'
+        assert response.data["inventory_number"].startswith("INV-")
 
     def test_create_equipment_regular_user_forbidden(
         self, api_client, user, category, department
     ):
         """Обычный пользователь не может создавать оборудование."""
         api_client.force_authenticate(user=user)
-        url = reverse('api:v1:procurement:equipment-list')
-        
+        url = reverse("api:v1:procurement:equipment-list")
+
         data = {
-            'name': 'Тестовое оборудование',
-            'inventory_number': 'INV-2026-999',
-            'category': category.id,
-            'department': department.id,
-            'purchase_date': '2026-02-01',
-            'purchase_cost': '10000.00',
+            "name": "Тестовое оборудование",
+            "inventory_number": "INV-2026-999",
+            "category": category.id,
+            "department": department.id,
+            "purchase_date": "2026-02-01",
+            "purchase_cost": "10000.00",
         }
-        
-        response = api_client.post(url, data, format='json')
+
+        response = api_client.post(url, data, format="json")
         assert response.status_code == status.HTTP_403_FORBIDDEN
 
     def test_create_equipment_duplicate_inventory_number(
@@ -251,20 +237,20 @@ class TestEquipmentCreate:
     ):
         """Нельзя создать с дублирующим инвентарным номером."""
         api_client.force_authenticate(user=staff_user)
-        url = reverse('api:v1:procurement:equipment-list')
-        
+        url = reverse("api:v1:procurement:equipment-list")
+
         data = {
-            'name': 'Другое оборудование',
-            'inventory_number': equipment.inventory_number,  # Дубликат!
-            'category': category.id,
-            'department': department.id,
-            'purchase_date': '2026-02-01',
-            'purchase_cost': '10000.00',
+            "name": "Другое оборудование",
+            "inventory_number": equipment.inventory_number,  # Дубликат!
+            "category": category.id,
+            "department": department.id,
+            "purchase_date": "2026-02-01",
+            "purchase_cost": "10000.00",
         }
-        
-        response = api_client.post(url, data, format='json')
+
+        response = api_client.post(url, data, format="json")
         assert response.status_code == status.HTTP_201_CREATED
-        assert response.data['inventory_number'] != equipment.inventory_number
+        assert response.data["inventory_number"] != equipment.inventory_number
 
 
 # ==============================================================================
@@ -275,27 +261,22 @@ class TestEquipmentCreate:
 class TestEquipmentDetail:
     """Тесты получения детальной информации об оборудовании."""
 
-    def test_retrieve_equipment(
-        self, api_client, user, equipment
-    ):
+    def test_retrieve_equipment(self, api_client, user, equipment):
         """Получение детальной информации."""
         api_client.force_authenticate(user=user)
         url = reverse(
-            'api:v1:procurement:equipment-detail',
-            kwargs={'pk': equipment.id}
+            "api:v1:procurement:equipment-detail", kwargs={"pk": equipment.id}
         )
         response = api_client.get(url)
-        
-        assert response.status_code == status.HTTP_200_OK
-        assert response.data['id'] == equipment.id
-        assert response.data['name'] == equipment.name
-        assert response.data['inventory_number'] == equipment.inventory_number
-        assert 'is_under_warranty' in response.data
-        assert response.data['is_under_warranty'] is True
 
-    def test_retrieve_with_maintenance_history(
-        self, api_client, user, equipment
-    ):
+        assert response.status_code == status.HTTP_200_OK
+        assert response.data["id"] == equipment.id
+        assert response.data["name"] == equipment.name
+        assert response.data["inventory_number"] == equipment.inventory_number
+        assert "is_under_warranty" in response.data
+        assert response.data["is_under_warranty"] is True
+
+    def test_retrieve_with_maintenance_history(self, api_client, user, equipment):
         """Детальная информация включает историю ТО."""
         # Создаем записи об обслуживании
         MaintenanceRecord.objects.create(
@@ -306,16 +287,15 @@ class TestEquipmentDetail:
             cost=Decimal("5000.00"),
             performed_by=user,
         )
-        
+
         api_client.force_authenticate(user=user)
         url = reverse(
-            'api:v1:procurement:equipment-detail',
-            kwargs={'pk': equipment.id}
+            "api:v1:procurement:equipment-detail", kwargs={"pk": equipment.id}
         )
         response = api_client.get(url)
-        
+
         assert response.status_code == status.HTTP_200_OK
-        assert response.data['maintenance_count'] >= 1
+        assert response.data["maintenance_count"] >= 1
 
 
 # ==============================================================================
@@ -326,40 +306,34 @@ class TestEquipmentDetail:
 class TestEquipmentUpdate:
     """Тесты обновления оборудования."""
 
-    def test_update_equipment_as_staff(
-        self, api_client, staff_user, equipment
-    ):
+    def test_update_equipment_as_staff(self, api_client, staff_user, equipment):
         """Обновление оборудования staff пользователем."""
         api_client.force_authenticate(user=staff_user)
         url = reverse(
-            'api:v1:procurement:equipment-detail',
-            kwargs={'pk': equipment.id}
+            "api:v1:procurement:equipment-detail", kwargs={"pk": equipment.id}
         )
-        
-        data = {
-            'location': 'Офис 4.01',
-            'notes': 'Перемещено в новый офис',
-        }
-        response = api_client.patch(url, data, format='json')
-        
-        assert response.status_code == status.HTTP_200_OK
-        assert response.data['location'] == 'Офис 4.01'
-        assert 'новый офис' in response.data['notes'].lower()
 
-    def test_update_equipment_regular_user_forbidden(
-        self, api_client, user, equipment
-    ):
+        data = {
+            "location": "Офис 4.01",
+            "notes": "Перемещено в новый офис",
+        }
+        response = api_client.patch(url, data, format="json")
+
+        assert response.status_code == status.HTTP_200_OK
+        assert response.data["location"] == "Офис 4.01"
+        assert "новый офис" in response.data["notes"].lower()
+
+    def test_update_equipment_regular_user_forbidden(self, api_client, user, equipment):
         """Ответственный пользователь может обновлять своё оборудование."""
         api_client.force_authenticate(user=user)
         url = reverse(
-            'api:v1:procurement:equipment-detail',
-            kwargs={'pk': equipment.id}
+            "api:v1:procurement:equipment-detail", kwargs={"pk": equipment.id}
         )
-        
-        data = {'location': 'Новое место'}
-        response = api_client.patch(url, data, format='json')
+
+        data = {"location": "Новое место"}
+        response = api_client.patch(url, data, format="json")
         assert response.status_code == status.HTTP_200_OK
-        assert response.data['location'] == 'Новое место'
+        assert response.data["location"] == "Новое место"
 
 
 # ==============================================================================
@@ -370,9 +344,7 @@ class TestEquipmentUpdate:
 class TestEquipmentActions:
     """Тесты специальных действий с оборудованием."""
 
-    def test_transfer_equipment(
-        self, api_client, staff_user, equipment, db
-    ):
+    def test_transfer_equipment(self, api_client, staff_user, equipment, db):
         """Передача оборудования."""
         new_user = Employee.objects.create_user(
             email="newuser@example.com",
@@ -380,28 +352,29 @@ class TestEquipmentActions:
             phone_number="+79995555555",
             first_name="Новый",
             last_name="Пользователь",
+            is_active=True,
             send_activation_email=False,
         )
-        
+
         api_client.force_authenticate(user=staff_user)
         url = reverse(
-            'api:v1:procurement:equipment-transfer',
-            kwargs={'pk': equipment.id}
+            "api:v1:procurement:equipment-transfer", kwargs={"pk": equipment.id}
         )
-        
+
         data = {
-            'to_person': new_user.id,
-            'to_location': 'Офис 2.10',
-            'reason': 'Перевод в другой отдел',
+            "to_person": new_user.id,
+            "to_location": "Офис 2.10",
+            "reason": "Перевод в другой отдел",
         }
-        response = api_client.post(url, data, format='json')
-        
+        response = api_client.post(url, data, format="json")
+
         assert response.status_code == status.HTTP_200_OK
-        
+
         # Проверяем что ответственный изменился
         equipment.refresh_from_db()
         assert equipment.responsible_person == new_user
-        assert equipment.location == 'Офис 2.10'
+        assert equipment.location == "Офис 2.10"
+
 
 # ==============================================================================
 # ТЕСТЫ КАТЕГОРИЙ
@@ -411,47 +384,41 @@ class TestEquipmentActions:
 class TestEquipmentCategories:
     """Тесты API категорий оборудования."""
 
-    def test_list_categories(
-        self, api_client, user, category
-    ):
+    def test_list_categories(self, api_client, user, category):
         """Список категорий."""
         api_client.force_authenticate(user=user)
-        url = reverse('api:v1:procurement:equipmentcategory-list')
+        url = reverse("api:v1:procurement:equipmentcategory-list")
         response = api_client.get(url)
-        
+
         assert response.status_code == status.HTTP_200_OK
         assert len(response.data) >= 1
 
-    def test_create_category_as_staff(
-        self, api_client, staff_user
-    ):
+    def test_create_category_as_staff(self, api_client, staff_user):
         """Создание категории staff пользователем."""
         api_client.force_authenticate(user=staff_user)
-        url = reverse('api:v1:procurement:equipmentcategory-list')
-        
-        data = {
-            'name': 'Мониторы',
-            'description': 'Все виды мониторов',
-            'icon': 'bi-display',
-        }
-        response = api_client.post(url, data, format='json')
-        
-        assert response.status_code == status.HTTP_201_CREATED
-        assert response.data['name'] == 'Мониторы'
+        url = reverse("api:v1:procurement:equipmentcategory-list")
 
-    def test_hierarchical_categories(
-        self, api_client, staff_user, category
-    ):
+        data = {
+            "name": "Мониторы",
+            "description": "Все виды мониторов",
+            "icon": "bi-display",
+        }
+        response = api_client.post(url, data, format="json")
+
+        assert response.status_code == status.HTTP_201_CREATED
+        assert response.data["name"] == "Мониторы"
+
+    def test_hierarchical_categories(self, api_client, staff_user, category):
         """Создание подкатегории."""
         api_client.force_authenticate(user=staff_user)
-        url = reverse('api:v1:procurement:equipmentcategory-list')
-        
+        url = reverse("api:v1:procurement:equipmentcategory-list")
+
         data = {
-            'name': 'Игровые ноутбуки',
-            'parent': category.id,
-            'description': 'Высокопроизводительные ноутбуки',
+            "name": "Игровые ноутбуки",
+            "parent": category.id,
+            "description": "Высокопроизводительные ноутбуки",
         }
-        response = api_client.post(url, data, format='json')
-        
+        response = api_client.post(url, data, format="json")
+
         assert response.status_code == status.HTTP_201_CREATED
-        assert response.data['parent'] == category.id
+        assert response.data["parent"] == category.id
diff --git a/backend/tests/finance/test_payroll_admin_api.py b/backend/tests/finance/test_payroll_admin_api.py
index d8b11660..7fbc179b 100644
--- a/backend/tests/finance/test_payroll_admin_api.py
+++ b/backend/tests/finance/test_payroll_admin_api.py
@@ -31,6 +31,7 @@ from finance.models import (
     PayrollTableReviewMark,
     PayrollWorkRecord,
 )
+from finance.payroll.config import DEFAULT_CONFIG
 from requests_app.enums import RequestStatus, RequestType
 from requests_app.models import Request
 
@@ -394,9 +395,7 @@ def test_copy_input_lines_previews_scope_and_handles_existing_values(
     assert component_preview[correction_credit.pk]["line_count"] == 0
     assert component_preview[correction_credit.pk]["employee_count"] == 0
     assert component_preview[correction_credit.pk]["amount_total"] == "0.00"
-    employee_preview = {
-        item["id"]: item for item in body["employees"]
-    }
+    employee_preview = {item["id"]: item for item in body["employees"]}
     assert employee_preview[active_employee.pk]["is_active"] is True
     assert employee_preview[inactive_employee.pk]["is_active"] is False
     assert employee_preview[active_employee.pk]["existing_component_counts"] == {
@@ -425,10 +424,13 @@ def test_copy_input_lines_previews_scope_and_handles_existing_values(
         "replaced_cells": 0,
         "voided": 0,
     }
-    assert PayrollInputLine.objects.filter(
-        period=target,
-        employee=inactive_employee,
-    ).count() == 0
+    assert (
+        PayrollInputLine.objects.filter(
+            period=target,
+            employee=inactive_employee,
+        ).count()
+        == 0
+    )
 
     replacement_key = uuid.uuid4()
     replaced = client.post(
@@ -861,9 +863,7 @@ def test_workspace_contract_is_minimal_and_redacts_money_without_view_all(
     assert inactive_employee.pk not in {item["id"] for item in body["employees"]}
     assert inactive_employee.pk in {item["id"] for item in body["rate_employees"]}
     assert hidden_employee.pk not in {item["id"] for item in body["employees"]}
-    assert hidden_employee.pk not in {
-        item["id"] for item in body["rate_employees"]
-    }
+    assert hidden_employee.pk not in {item["id"] for item in body["rate_employees"]}
 
 
 def test_workspace_readiness_identifies_affected_employees_and_draft_counts(
@@ -1018,9 +1018,7 @@ def test_period_table_lists_all_employees_and_requires_view_all(
     assert response.status_code == 200, response.content
     assert_no_store(response)
     body = response.json()
-    assert hidden_employee.pk not in {
-        item["employee"]["id"] for item in body["rows"]
-    }
+    assert hidden_employee.pk not in {item["employee"]["id"] for item in body["rows"]}
     assert body["period_id"] == period.pk
     assert body["calculation_rules"]["point_policy"] == "proportional_with_excess"
     assert body["calculation_rules"]["money_quantum"] == "0.01"
@@ -1051,9 +1049,7 @@ def test_period_table_lists_all_employees_and_requires_view_all(
     assert row["opening_balance"] == "0"
     assert row["closing_balance"] == "0.00"
     assert row["totals_preliminary"] is True
-    assert all(
-        item["employee_id"] != employee.pk for item in body["carryovers"]
-    )
+    assert all(item["employee_id"] != employee.pk for item in body["carryovers"])
     assert body["summary"]["preliminary_count"] == body["summary"]["employee_count"]
     missing_row = next(
         item for item in body["rows"] if item["employee"]["id"] == missing_employee.pk
@@ -1179,17 +1175,23 @@ def test_period_table_review_marks_are_personal_and_idempotent(
         assert response.status_code == 200, response.content
         assert response.json() == {"employee_ids": [employee.pk]}
 
-    assert PayrollTableReviewMark.objects.filter(
-        period=period,
-        reviewer=first_reviewer,
-        employee=employee,
-    ).count() == 1
+    assert (
+        PayrollTableReviewMark.objects.filter(
+            period=period,
+            reviewer=first_reviewer,
+            employee=employee,
+        ).count()
+        == 1
+    )
     assert first_client.get(api_url("admin-period-table", pk=period.pk)).json()[
         "review_mark_employee_ids"
     ] == [employee.pk]
-    assert auth_client_factory(second_reviewer).get(
-        api_url("admin-period-table", pk=period.pk)
-    ).json()["review_mark_employee_ids"] == []
+    assert (
+        auth_client_factory(second_reviewer)
+        .get(api_url("admin-period-table", pk=period.pk))
+        .json()["review_mark_employee_ids"]
+        == []
+    )
 
     cleared = first_client.delete(url)
     assert cleared.status_code == 200, cleared.content
@@ -2148,7 +2150,8 @@ def test_workspace_blocks_period_outside_ruleset_effective_dates(
         "code": "RULESET_NOT_EFFECTIVE",
         "message": (
             "Для выбранного периода нет действующих правил расчёта. "
-            "Набор eusrr-standard, версия 2026.08.1, применяется с 01.07.2026. "
+            f"Набор eusrr-standard, версия {DEFAULT_CONFIG['RULESET_VERSION']}, "
+            "применяется с 01.07.2026. "
             "Измените период или подключите историческую версию правил."
         ),
         "details": {
@@ -2158,7 +2161,7 @@ def test_workspace_blocks_period_outside_ruleset_effective_dates(
             },
             "ruleset": {
                 "id": "eusrr-standard",
-                "version": "2026.08.1",
+                "version": DEFAULT_CONFIG["RULESET_VERSION"],
                 "effective_from": "2026-07-01",
             },
         },
@@ -3285,7 +3288,9 @@ def test_staff_admin_completes_entire_payroll_workflow_with_one_command(
         for row in table_after_confirmation.json()["rows"]
         if row["employee"]["id"] == employee.pk
     )
-    assert confirmed_row["payment_confirmation"]["confirmed_by"]["id"] == administrator.pk
+    assert (
+        confirmed_row["payment_confirmation"]["confirmed_by"]["id"] == administrator.pk
+    )
 
     revoked = administrator_client.post(
         api_url(
diff --git a/backend/tests/finance/test_payroll_services.py b/backend/tests/finance/test_payroll_services.py
index a61eef09..1838e56f 100644
--- a/backend/tests/finance/test_payroll_services.py
+++ b/backend/tests/finance/test_payroll_services.py
@@ -32,6 +32,7 @@ from finance.models import (
     PayrollWorkRecord,
 )
 from finance.payroll.exceptions import PayrollOperationError, PayrollPermissionDenied
+from finance.payroll.config import DEFAULT_CONFIG
 from finance.payroll.services import (
     acknowledge_statement,
     approve_input_line,
@@ -230,7 +231,9 @@ def test_only_manual_corrections_move_between_periods_and_can_be_settled(
         (june_payment, approve_input_line),
         (june_correction, approve_input_line),
     ):
-        approve(instance.pk, actor=approver, expected_lock_version=instance.lock_version)
+        approve(
+            instance.pk, actor=approver, expected_lock_version=instance.lock_version
+        )
 
     june_run = calculate_period(june_period.pk, actor=operator)
     june_statement = june_run.statements.get(employee=employee)
@@ -277,7 +280,9 @@ def test_only_manual_corrections_move_between_periods_and_can_be_settled(
         (july_payment, approve_input_line),
         (july_correction, approve_input_line),
     ):
-        approve(instance.pk, actor=approver, expected_lock_version=instance.lock_version)
+        approve(
+            instance.pk, actor=approver, expected_lock_version=instance.lock_version
+        )
 
     july_run = calculate_period(july_period.pk, actor=operator)
     july_statement = july_run.statements.get(employee=employee)
@@ -326,7 +331,9 @@ def test_only_manual_corrections_move_between_periods_and_can_be_settled(
         (august_payment, approve_input_line),
         (august_correction, approve_input_line),
     ):
-        approve(instance.pk, actor=approver, expected_lock_version=instance.lock_version)
+        approve(
+            instance.pk, actor=approver, expected_lock_version=instance.lock_version
+        )
 
     august_run = calculate_period(august_period.pk, actor=operator)
     august_statement = august_run.statements.get(employee=employee)
@@ -740,7 +747,8 @@ def test_ruleset_not_effective_keeps_domain_code_and_localized_message(
     assert error.value.code == "RULESET_NOT_EFFECTIVE"
     assert error.value.message == (
         "Для выбранного периода нет действующих правил расчёта. "
-        "Набор eusrr-standard, версия 2026.08.1, применяется с 01.07.2026. "
+        f"Набор eusrr-standard, версия {DEFAULT_CONFIG['RULESET_VERSION']}, "
+        "применяется с 01.07.2026. "
         "Измените период или подключите историческую версию правил."
     )
     assert error.value.details["employee_id"] == payroll_users["employee"].pk
@@ -750,7 +758,7 @@ def test_ruleset_not_effective_keeps_domain_code_and_localized_message(
     }
     assert error.value.details["ruleset"] == {
         "id": "eusrr-standard",
-        "version": "2026.08.1",
+        "version": DEFAULT_CONFIG["RULESET_VERSION"],
         "effective_from": "2026-07-01",
     }
     assert {issue["code"] for issue in error.value.details["issues"]} == {
diff --git a/backend/tests/procurement/test_expected_delivery_dates_migration.py b/backend/tests/procurement/test_expected_delivery_dates_migration.py
index c8967fe2..41e51b32 100644
--- a/backend/tests/procurement/test_expected_delivery_dates_migration.py
+++ b/backend/tests/procurement/test_expected_delivery_dates_migration.py
@@ -11,6 +11,9 @@ pytestmark = pytest.mark.django_db(transaction=True)
 def _migrate_to(target):
     executor = MigrationExecutor(connection)
     executor.loader.build_graph()
+    target_apps = {app_label for app_label, _ in target}
+    if "employees" not in target_apps:
+        target = [*target, *executor.loader.graph.leaf_nodes("employees")]
     executor.migrate(target)
     return executor.loader.project_state(target).apps
 
diff --git a/backend/tests/scheduling/test_calendar_binding_migration.py b/backend/tests/scheduling/test_calendar_binding_migration.py
index 4838fd2d..ff777437 100644
--- a/backend/tests/scheduling/test_calendar_binding_migration.py
+++ b/backend/tests/scheduling/test_calendar_binding_migration.py
@@ -39,12 +39,17 @@ def test_migration_0002_backfills_department_binding_by_slug():
             slug=f"department-{department.id}",
         )
 
-        _migrate_to([("scheduling", "0002_calendarbinding")])
-
-        from scheduling.models import CalendarBinding
+        new_apps = _migrate_to(
+            [
+                ("employees", "0047_alter_departmentpermission_code"),
+                ("schedule", "0015_rename_indexes"),
+                ("scheduling", "0002_calendarbinding"),
+            ]
+        )
+        CalendarBinding = new_apps.get_model("scheduling", "CalendarBinding")
 
         binding = CalendarBinding.objects.get(calendar_id=calendar.id)
-        assert binding.type == CalendarBinding.BindingType.DEPARTMENT
+        assert binding.type == "department"
         assert binding.context_object_id == department.id
         assert binding.context_content_type.app_label == "employees"
         assert binding.context_content_type.model == "department"