diff --git a/pyproject.toml b/pyproject.toml
index cd614cd..826eb2d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,6 +30,9 @@ dev = [
 [tool.pyright]
 typeCheckingMode = "standard"
 
+[tool.isort]
+line_length = 110
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
diff --git a/src/trudex/application/__main__.py b/src/trudex/application/__main__.py
index 0b0b213..45d3fa9 100644
--- a/src/trudex/application/__main__.py
+++ b/src/trudex/application/__main__.py
@@ -9,42 +9,26 @@ from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from dishka import make_async_container
 from dishka.integrations.aiogram import setup_dishka
 
-from trudex.application.bot.admin_dialogs.broadcast import \
-    broadcast_dialog as admin_broadcast_dialog
-from trudex.application.bot.admin_dialogs.create_test import \
-    admin_create_test_dialog
-from trudex.application.bot.admin_dialogs.groups import \
-    groups_dialog as admin_groups_dialog
+from trudex.application.bot.admin_dialogs.broadcast import broadcast_dialog as admin_broadcast_dialog
+from trudex.application.bot.admin_dialogs.create_test import admin_create_test_dialog
+from trudex.application.bot.admin_dialogs.groups import groups_dialog as admin_groups_dialog
 from trudex.application.bot.admin_dialogs.main_menu import admin_menu_dialog
-from trudex.application.bot.admin_dialogs.templates import \
-    templates_dialog as admin_templates_dialog
-from trudex.application.bot.admin_dialogs.tests import \
-    tests_dialog as admin_tests_dialog
-from trudex.application.bot.admin_dialogs.users import \
-    users_dialog as admin_users_dialog
-from trudex.application.bot.creator_dialogs.broadcast import \
-    broadcast_dialog as creator_broadcast_dialog
-from trudex.application.bot.creator_dialogs.create_test import \
-    create_test_dialog
-from trudex.application.bot.creator_dialogs.groups import \
-    groups_dialog as creator_groups_dialog
-from trudex.application.bot.creator_dialogs.main_menu import \
-    creator_menu_dialog
-from trudex.application.bot.creator_dialogs.templates import \
-    templates_dialog as creator_templates_dialog
-from trudex.application.bot.creator_dialogs.tests import \
-    tests_dialog as creator_tests_dialog
-from trudex.application.bot.creator_dialogs.users import \
-    users_dialog as creator_users_dialog
+from trudex.application.bot.admin_dialogs.templates import templates_dialog as admin_templates_dialog
+from trudex.application.bot.admin_dialogs.tests import tests_dialog as admin_tests_dialog
+from trudex.application.bot.admin_dialogs.users import users_dialog as admin_users_dialog
+from trudex.application.bot.creator_dialogs.broadcast import broadcast_dialog as creator_broadcast_dialog
+from trudex.application.bot.creator_dialogs.create_test import create_test_dialog
+from trudex.application.bot.creator_dialogs.groups import groups_dialog as creator_groups_dialog
+from trudex.application.bot.creator_dialogs.main_menu import creator_menu_dialog
+from trudex.application.bot.creator_dialogs.templates import templates_dialog as creator_templates_dialog
+from trudex.application.bot.creator_dialogs.tests import tests_dialog as creator_tests_dialog
+from trudex.application.bot.creator_dialogs.users import users_dialog as creator_users_dialog
 from trudex.application.bot.handlers import router
-from trudex.application.bot.middlewares.reject_not_admin import \
-    RejectNotAdminMiddleware
-from trudex.application.bot.middlewares.reject_not_creator import \
-    RejectNotCreatorMiddleware
+from trudex.application.bot.middlewares.reject_not_admin import RejectNotAdminMiddleware
+from trudex.application.bot.middlewares.reject_not_creator import RejectNotCreatorMiddleware
 from trudex.application.bot.user_dialogs.deeplink import deeplink_dialog
 from trudex.application.bot.user_dialogs.main_menu import user_menu_dialog
-from trudex.application.bot.user_dialogs.registration import \
-    registration_dialog
+from trudex.application.bot.user_dialogs.registration import registration_dialog
 from trudex.application.bot.user_dialogs.take_test import take_test_dialog
 from trudex.infrastructure.database.repo.user import UserRepository
 from trudex.infrastructure.di import DatabaseProvider, SchedulerProvider
@@ -99,8 +83,6 @@ async def main() -> None:
     )
     setup_dialogs(dp)
     setup_dishka(container, dp, auto_inject=True)
-
-    bott = await container.get(Bot)
     
     async with container() as request_container:
         user_repo = await request_container.get(UserRepository)
diff --git a/src/trudex/application/bot/admin_dialogs/broadcast.py b/src/trudex/application/bot/admin_dialogs/broadcast.py
index 7f49806..44a82ba 100644
--- a/src/trudex/application/bot/admin_dialogs/broadcast.py
+++ b/src/trudex/application/bot/admin_dialogs/broadcast.py
@@ -6,8 +6,7 @@ from aiogram_dialog.widgets.text import Const
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.admin_dialogs.states import (AdminBroadcastSG,
-                                                         AdminMenuSG)
+from trudex.application.bot.admin_dialogs.states import AdminBroadcastSG, AdminMenuSG
 from trudex.infrastructure.database.dao.user import UserDAO
 from trudex.infrastructure.utils.broadcast import broadcast_message
 
diff --git a/src/trudex/application/bot/admin_dialogs/create_test.py b/src/trudex/application/bot/admin_dialogs/create_test.py
index cee34c2..006e48a 100644
--- a/src/trudex/application/bot/admin_dialogs/create_test.py
+++ b/src/trudex/application/bot/admin_dialogs/create_test.py
@@ -3,14 +3,12 @@ from datetime import date, datetime, time
 from aiogram.types import CallbackQuery, ContentType, Message
 from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.widgets.input import MessageInput
-from aiogram_dialog.widgets.kbd import (Button, Calendar, Cancel, Column, Row,
-                                        ScrollingGroup, Select)
+from aiogram_dialog.widgets.kbd import Button, Calendar, Cancel, Column, Row, ScrollingGroup, Select
 from aiogram_dialog.widgets.text import Const, Format
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.admin_dialogs.states import (AdminCreateTestSG,
-                                                         AdminTestsSG)
+from trudex.application.bot.admin_dialogs.states import AdminCreateTestSG, AdminTestsSG
 from trudex.infrastructure.database.dao.group import GroupDAO
 from trudex.infrastructure.database.dao.option import OptionDAO
 from trudex.infrastructure.database.dao.question import QuestionDAO
diff --git a/src/trudex/application/bot/admin_dialogs/groups.py b/src/trudex/application/bot/admin_dialogs/groups.py
index 75bab05..8b80665 100644
--- a/src/trudex/application/bot/admin_dialogs/groups.py
+++ b/src/trudex/application/bot/admin_dialogs/groups.py
@@ -1,14 +1,12 @@
 from aiogram.types import CallbackQuery, Message
 from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.widgets.input import MessageInput
-from aiogram_dialog.widgets.kbd import (Button, Column, Row, ScrollingGroup,
-                                        Select)
+from aiogram_dialog.widgets.kbd import Button, Column, Row, ScrollingGroup, Select
 from aiogram_dialog.widgets.text import Const, Format
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.admin_dialogs.states import (AdminGroupsSG,
-                                                         AdminMenuSG)
+from trudex.application.bot.admin_dialogs.states import AdminGroupsSG, AdminMenuSG
 from trudex.infrastructure.database.dao.group import GroupDAO
 
 
diff --git a/src/trudex/application/bot/admin_dialogs/main_menu.py b/src/trudex/application/bot/admin_dialogs/main_menu.py
index 33d9d36..c59ad27 100644
--- a/src/trudex/application/bot/admin_dialogs/main_menu.py
+++ b/src/trudex/application/bot/admin_dialogs/main_menu.py
@@ -3,12 +3,8 @@ from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.widgets.kbd import Button, Column
 from aiogram_dialog.widgets.text import Const
 
-from trudex.application.bot.admin_dialogs.states import (AdminBroadcastSG,
-                                                         AdminGroupsSG,
-                                                         AdminMenuSG,
-                                                         AdminTemplatesSG,
-                                                         AdminTestsSG,
-                                                         AdminUsersSG)
+from trudex.application.bot.admin_dialogs.states import (AdminBroadcastSG, AdminGroupsSG, AdminMenuSG,
+                                                         AdminTemplatesSG, AdminTestsSG, AdminUsersSG)
 
 
 async def on_tests_clicked(_callback: CallbackQuery, _button: Button, manager: DialogManager) -> None:
diff --git a/src/trudex/application/bot/admin_dialogs/templates.py b/src/trudex/application/bot/admin_dialogs/templates.py
index 8529035..80329aa 100644
--- a/src/trudex/application/bot/admin_dialogs/templates.py
+++ b/src/trudex/application/bot/admin_dialogs/templates.py
@@ -10,13 +10,13 @@ from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
 from trudex.application.bot.admin_dialogs.states import AdminMenuSG, AdminTemplatesSG, AdminTestsSG
+from trudex.domain.schemas import QuestionType
 from trudex.domain.test_parser import ParsedTest, TestParser
 from trudex.infrastructure.database.dao.option import OptionDAO
 from trudex.infrastructure.database.dao.question import QuestionDAO
 from trudex.infrastructure.database.dao.test import TestDAO
 from trudex.infrastructure.database.repo.test import TestRepository
 
-
 TEMPLATES_INFO = (
     "<b>📦 Шаблоны тестов</b>\n\n"
     "Шаблоны позволяют экспортировать и импортировать тесты в формате JSON.\n\n"
@@ -227,7 +227,7 @@ async def on_test_selected_for_export(
             "question_type": question.question_type,
         }
         
-        if question.question_type == "input":
+        if question.question_type == QuestionType.INPUT:
             correct_options = [o for o in options if o.is_correct]
             if correct_options:
                 question_data["correct_answer"] = correct_options[0].text
diff --git a/src/trudex/application/bot/admin_dialogs/tests.py b/src/trudex/application/bot/admin_dialogs/tests.py
index 7bfbe80..6cd66ab 100644
--- a/src/trudex/application/bot/admin_dialogs/tests.py
+++ b/src/trudex/application/bot/admin_dialogs/tests.py
@@ -6,15 +6,12 @@ from aiogram import Bot
 from aiogram.types import BufferedInputFile, CallbackQuery, Message
 from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.widgets.input import MessageInput
-from aiogram_dialog.widgets.kbd import (Button, Calendar, Column,
-                                        ScrollingGroup, Select)
+from aiogram_dialog.widgets.kbd import Button, Calendar, Column, ScrollingGroup, Select
 from aiogram_dialog.widgets.text import Const, Format
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.admin_dialogs.states import (AdminMenuSG,
-                                                         AdminTestsSG,
-                                                         AdminCreateTestSG)
+from trudex.application.bot.admin_dialogs.states import AdminCreateTestSG, AdminMenuSG, AdminTestsSG
 from trudex.infrastructure.database.dao.group import GroupDAO
 from trudex.infrastructure.database.dao.test import TestDAO
 from trudex.infrastructure.database.repo.test import TestRepository
diff --git a/src/trudex/application/bot/admin_dialogs/users.py b/src/trudex/application/bot/admin_dialogs/users.py
index 34a08b6..55cba6b 100644
--- a/src/trudex/application/bot/admin_dialogs/users.py
+++ b/src/trudex/application/bot/admin_dialogs/users.py
@@ -1,14 +1,12 @@
 from aiogram.types import CallbackQuery, Message
 from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.widgets.input import MessageInput
-from aiogram_dialog.widgets.kbd import (Button, Column, ScrollingGroup, Select,
-                                        SwitchTo)
+from aiogram_dialog.widgets.kbd import Button, Column, ScrollingGroup, Select, SwitchTo
 from aiogram_dialog.widgets.text import Const, Format
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.admin_dialogs.states import (AdminMenuSG,
-                                                         AdminUsersSG)
+from trudex.application.bot.admin_dialogs.states import AdminMenuSG, AdminUsersSG
 from trudex.infrastructure.database.dao.user import UserDAO
 
 
diff --git a/src/trudex/application/bot/creator_dialogs/broadcast.py b/src/trudex/application/bot/creator_dialogs/broadcast.py
index 52878fc..ba534fd 100644
--- a/src/trudex/application/bot/creator_dialogs/broadcast.py
+++ b/src/trudex/application/bot/creator_dialogs/broadcast.py
@@ -6,8 +6,7 @@ from aiogram_dialog.widgets.text import Const
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.creator_dialogs.states import (CreatorBroadcastSG,
-                                                           CreatorMenuSG)
+from trudex.application.bot.creator_dialogs.states import CreatorBroadcastSG, CreatorMenuSG
 from trudex.infrastructure.database.dao.user import UserDAO
 from trudex.infrastructure.utils.broadcast import broadcast_message
 
diff --git a/src/trudex/application/bot/creator_dialogs/create_test.py b/src/trudex/application/bot/creator_dialogs/create_test.py
index 513a21c..22ce7cb 100644
--- a/src/trudex/application/bot/creator_dialogs/create_test.py
+++ b/src/trudex/application/bot/creator_dialogs/create_test.py
@@ -3,14 +3,12 @@ from datetime import date, datetime, time
 from aiogram.types import CallbackQuery, ContentType, Message
 from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.widgets.input import MessageInput
-from aiogram_dialog.widgets.kbd import (Button, Calendar, Cancel, Column, Row,
-                                        ScrollingGroup, Select)
+from aiogram_dialog.widgets.kbd import Button, Calendar, Cancel, Column, Row, ScrollingGroup, Select
 from aiogram_dialog.widgets.text import Const, Format
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.creator_dialogs.states import (CreateTestSG,
-                                                           CreatorTestsSG)
+from trudex.application.bot.creator_dialogs.states import CreateTestSG, CreatorTestsSG
 from trudex.infrastructure.database.dao.group import GroupDAO
 from trudex.infrastructure.database.dao.option import OptionDAO
 from trudex.infrastructure.database.dao.question import QuestionDAO
diff --git a/src/trudex/application/bot/creator_dialogs/groups.py b/src/trudex/application/bot/creator_dialogs/groups.py
index a5565bd..b8ff31c 100644
--- a/src/trudex/application/bot/creator_dialogs/groups.py
+++ b/src/trudex/application/bot/creator_dialogs/groups.py
@@ -1,14 +1,12 @@
 from aiogram.types import CallbackQuery, Message
 from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.widgets.input import MessageInput
-from aiogram_dialog.widgets.kbd import (Button, Column, Row, ScrollingGroup,
-                                        Select)
+from aiogram_dialog.widgets.kbd import Button, Column, Row, ScrollingGroup, Select
 from aiogram_dialog.widgets.text import Const, Format
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.creator_dialogs.states import (CreatorGroupsSG,
-                                                           CreatorMenuSG)
+from trudex.application.bot.creator_dialogs.states import CreatorGroupsSG, CreatorMenuSG
 from trudex.infrastructure.database.dao.group import GroupDAO
 
 
diff --git a/src/trudex/application/bot/creator_dialogs/main_menu.py b/src/trudex/application/bot/creator_dialogs/main_menu.py
index a37ebbf..b77a873 100644
--- a/src/trudex/application/bot/creator_dialogs/main_menu.py
+++ b/src/trudex/application/bot/creator_dialogs/main_menu.py
@@ -3,12 +3,8 @@ from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.widgets.kbd import Button, Column
 from aiogram_dialog.widgets.text import Const
 
-from trudex.application.bot.creator_dialogs.states import (CreatorBroadcastSG,
-                                                           CreatorGroupsSG,
-                                                           CreatorMenuSG,
-                                                           CreatorTemplatesSG,
-                                                           CreatorTestsSG,
-                                                           CreatorUsersSG)
+from trudex.application.bot.creator_dialogs.states import (CreatorBroadcastSG, CreatorGroupsSG, CreatorMenuSG,
+                                                           CreatorTemplatesSG, CreatorTestsSG, CreatorUsersSG)
 
 
 async def on_tests_clicked(_callback: CallbackQuery, _button: Button, manager: DialogManager) -> None:
diff --git a/src/trudex/application/bot/creator_dialogs/templates.py b/src/trudex/application/bot/creator_dialogs/templates.py
index 396c774..9a12de9 100644
--- a/src/trudex/application/bot/creator_dialogs/templates.py
+++ b/src/trudex/application/bot/creator_dialogs/templates.py
@@ -10,13 +10,13 @@ from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
 from trudex.application.bot.creator_dialogs.states import CreatorMenuSG, CreatorTemplatesSG, CreatorTestsSG
+from trudex.domain.schemas import QuestionType
 from trudex.domain.test_parser import ParsedTest, TestParser
 from trudex.infrastructure.database.dao.option import OptionDAO
 from trudex.infrastructure.database.dao.question import QuestionDAO
 from trudex.infrastructure.database.dao.test import TestDAO
 from trudex.infrastructure.database.repo.test import TestRepository
 
-
 TEMPLATES_INFO = (
     "<b>📦 Шаблоны тестов</b>\n\n"
     "Шаблоны позволяют экспортировать и импортировать тесты в формате JSON.\n\n"
@@ -227,7 +227,7 @@ async def on_test_selected_for_export(
             "question_type": question.question_type,
         }
         
-        if question.question_type == "input":
+        if question.question_type == QuestionType.INPUT:
             correct_options = [o for o in options if o.is_correct]
             if correct_options:
                 question_data["correct_answer"] = correct_options[0].text
diff --git a/src/trudex/application/bot/creator_dialogs/tests.py b/src/trudex/application/bot/creator_dialogs/tests.py
index 42969ab..6cd9ba4 100644
--- a/src/trudex/application/bot/creator_dialogs/tests.py
+++ b/src/trudex/application/bot/creator_dialogs/tests.py
@@ -8,16 +8,13 @@ from aiogram.types import BufferedInputFile, CallbackQuery, Message
 from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.api.entities import MediaAttachment
 from aiogram_dialog.widgets.input import MessageInput
-from aiogram_dialog.widgets.kbd import (Button, Calendar, Column, Row,
-                                        ScrollingGroup, Select)
+from aiogram_dialog.widgets.kbd import Button, Calendar, Column, Row, ScrollingGroup, Select
 from aiogram_dialog.widgets.media import DynamicMedia
 from aiogram_dialog.widgets.text import Const, Format
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.creator_dialogs.states import (CreateTestSG,
-                                                           CreatorMenuSG,
-                                                           CreatorTestsSG)
+from trudex.application.bot.creator_dialogs.states import CreateTestSG, CreatorMenuSG, CreatorTestsSG
 from trudex.infrastructure.database.dao.group import GroupDAO
 from trudex.infrastructure.database.dao.test import TestDAO
 from trudex.infrastructure.database.repo.test import TestRepository
diff --git a/src/trudex/application/bot/creator_dialogs/users.py b/src/trudex/application/bot/creator_dialogs/users.py
index 3d5e741..294f551 100644
--- a/src/trudex/application/bot/creator_dialogs/users.py
+++ b/src/trudex/application/bot/creator_dialogs/users.py
@@ -4,14 +4,12 @@ from aiogram import Bot
 from aiogram.types import CallbackQuery, Message
 from aiogram_dialog import Dialog, DialogManager, StartMode, Window
 from aiogram_dialog.widgets.input import MessageInput
-from aiogram_dialog.widgets.kbd import (Button, Column, Row, ScrollingGroup,
-                                        Select, SwitchTo)
+from aiogram_dialog.widgets.kbd import Button, Column, Row, ScrollingGroup, Select, SwitchTo
 from aiogram_dialog.widgets.text import Const, Format
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.creator_dialogs.states import (CreatorMenuSG,
-                                                           CreatorUsersSG)
+from trudex.application.bot.creator_dialogs.states import CreatorMenuSG, CreatorUsersSG
 from trudex.infrastructure.database.dao.user import UserDAO
 from trudex.infrastructure.database.repo.user import UserRepository
 from trudex.infrastructure.utils.bot_commands import setup_bot_commands
diff --git a/src/trudex/application/bot/handlers.py b/src/trudex/application/bot/handlers.py
index 75b0570..2b4d54f 100644
--- a/src/trudex/application/bot/handlers.py
+++ b/src/trudex/application/bot/handlers.py
@@ -1,5 +1,7 @@
+import logging
+
 from aiogram import Router
-from aiogram.filters import Command, CommandStart, CommandObject
+from aiogram.filters import Command, CommandObject, CommandStart
 from aiogram.types import ErrorEvent, Message
 from aiogram_dialog import DialogManager, StartMode
 from aiogram_dialog.api.exceptions import OutdatedIntent, UnknownIntent
@@ -7,11 +9,7 @@ from dishka.integrations.aiogram import FromDishka
 
 from trudex.application.bot.admin_dialogs.states import AdminMenuSG
 from trudex.application.bot.creator_dialogs.states import CreatorMenuSG
-from trudex.application.bot.user_dialogs.states import (
-    UserDeeplinkSG,
-    UserMenuSG,
-    UserRegistrationSG,
-)
+from trudex.application.bot.user_dialogs.states import UserDeeplinkSG, UserMenuSG, UserRegistrationSG
 from trudex.infrastructure.database.dao.group import GroupDAO
 from trudex.infrastructure.database.dao.test import TestDAO
 from trudex.infrastructure.database.dao.user import UserDAO
@@ -20,6 +18,7 @@ from trudex.infrastructure.utils.test_id_to_hash import decode_id
 from trudex.infrastructure.utils.timezone import now_msk_naive
 
 router = Router()
+logger = logging.getLogger(__name__)
 
 
 async def ensure_user_registered(
@@ -115,6 +114,13 @@ async def start_with_deeplink(
     assert message.from_user is not None
     
     deeplink = command.args
+    logger.info(
+        "Deeplink start: user_id=%d, username=%s, deeplink=%s",
+        message.from_user.id,
+        message.from_user.username,
+        deeplink,
+    )
+    
     if not deeplink:
         await start_handler(message, user_dao, group_dao, dialog_manager)
         return
@@ -122,6 +128,7 @@ async def start_with_deeplink(
     try:
         test_id = decode_id(deeplink, config.security.encode_key)
     except (ValueError, IndexError):
+        logger.warning("Invalid deeplink: user_id=%d, deeplink=%s", message.from_user.id, deeplink)
         await message.answer("❌ Неверная ссылка на тест")
         await start_handler(message, user_dao, group_dao, dialog_manager)
         return
@@ -138,6 +145,12 @@ async def start_with_deeplink(
     )
     
     if not is_valid:
+        logger.info(
+            "Test validation failed: user_id=%d, test_id=%d, error=%s",
+            message.from_user.id,
+            test_id,
+            error,
+        )
         await dialog_manager.start(
             UserDeeplinkSG.test_preview,
             mode=StartMode.RESET_STACK,
@@ -145,6 +158,7 @@ async def start_with_deeplink(
         )
         return
     
+    logger.info("User starting test via deeplink: user_id=%d, test_id=%d", message.from_user.id, test_id)
     await dialog_manager.start(
         UserDeeplinkSG.test_preview,
         mode=StartMode.RESET_STACK,
@@ -159,6 +173,13 @@ async def start_handler(
     user_dao: FromDishka[UserDAO],
     group_dao: FromDishka[GroupDAO],
 ) -> None:
+    assert message.from_user is not None
+    logger.info(
+        "Start command: user_id=%d, username=%s",
+        message.from_user.id,
+        message.from_user.username,
+    )
+    
     is_registered = await ensure_user_registered(
         user_dao, group_dao, message, dialog_manager
     )
@@ -169,15 +190,22 @@ async def start_handler(
 
 @router.message(Command("admin"))
 async def admin_command(_message: Message, dialog_manager: DialogManager) -> None:
+    assert _message.from_user is not None
+    logger.info("Admin panel access: user_id=%d", _message.from_user.id)
     await dialog_manager.start(AdminMenuSG.main, mode=StartMode.RESET_STACK)
 
 
 @router.message(Command("creator"))
 async def creator_command(_message: Message, dialog_manager: DialogManager) -> None:
+    assert _message.from_user is not None
+    logger.info("Creator panel access: user_id=%d", _message.from_user.id)
     await dialog_manager.start(CreatorMenuSG.main, mode=StartMode.RESET_STACK)
 
 
 @router.error()
 async def dialog_error_handler(event: ErrorEvent, dialog_manager: DialogManager) -> None:
     if isinstance(event.exception, (UnknownIntent, OutdatedIntent)):
+        logger.debug("Dialog intent error, resetting to main menu: %s", type(event.exception).__name__)
         await dialog_manager.start(UserMenuSG.main, mode=StartMode.RESET_STACK)
+    else:
+        logger.exception("Unhandled error in dialog: %s", event.exception)
diff --git a/src/trudex/application/bot/user_dialogs/main_menu.py b/src/trudex/application/bot/user_dialogs/main_menu.py
index 21da133..1460415 100644
--- a/src/trudex/application/bot/user_dialogs/main_menu.py
+++ b/src/trudex/application/bot/user_dialogs/main_menu.py
@@ -1,6 +1,6 @@
 import asyncio
 import functools
-from datetime import timedelta
+from datetime import datetime, timedelta
 
 from aiogram import Bot
 from aiogram.types import BufferedInputFile, CallbackQuery, Message
@@ -21,7 +21,6 @@ from trudex.infrastructure.utils.config import Config
 from trudex.infrastructure.utils.qr_generator import generate_qr_bytes
 from trudex.infrastructure.utils.test_id_to_hash import encode_id
 from trudex.infrastructure.utils.timezone import now_msk, now_msk_naive, to_msk
-from datetime import datetime
 
 
 def can_edit_field(updated_at: datetime | None) -> bool:
diff --git a/src/trudex/application/bot/user_dialogs/registration.py b/src/trudex/application/bot/user_dialogs/registration.py
index 916dcca..953cf23 100644
--- a/src/trudex/application/bot/user_dialogs/registration.py
+++ b/src/trudex/application/bot/user_dialogs/registration.py
@@ -6,11 +6,7 @@ from aiogram_dialog.widgets.text import Const, Format
 from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
-from trudex.application.bot.user_dialogs.states import (
-    UserDeeplinkSG,
-    UserMenuSG,
-    UserRegistrationSG,
-)
+from trudex.application.bot.user_dialogs.states import UserDeeplinkSG, UserMenuSG, UserRegistrationSG
 from trudex.infrastructure.database.dao.group import GroupDAO
 from trudex.infrastructure.database.dao.user import UserDAO
 
diff --git a/src/trudex/application/bot/user_dialogs/take_test.py b/src/trudex/application/bot/user_dialogs/take_test.py
index 6479df6..c1b6e6f 100644
--- a/src/trudex/application/bot/user_dialogs/take_test.py
+++ b/src/trudex/application/bot/user_dialogs/take_test.py
@@ -7,9 +7,9 @@ from dishka import FromDishka
 from dishka.integrations.aiogram_dialog import inject
 
 from trudex.application.bot.user_dialogs.states import UserMenuSG, UserTestSG
+from trudex.domain.schemas import QuestionType
 from trudex.infrastructure.database.dao.test import TestDAO
 from trudex.infrastructure.database.dao.user_answer import UserAnswerDAO
-from trudex.infrastructure.database.models import QuestionType
 from trudex.infrastructure.database.repo.test import TestRepository
 from trudex.infrastructure.database.repo.test_attempt import TestAttemptRepository
 from trudex.infrastructure.utils.timezone import now_msk_naive
diff --git a/src/trudex/domain/schemas.py b/src/trudex/domain/schemas.py
index 46878d1..74db228 100644
--- a/src/trudex/domain/schemas.py
+++ b/src/trudex/domain/schemas.py
@@ -1,5 +1,12 @@
 from dataclasses import dataclass
 from datetime import datetime
+from enum import Enum
+
+
+class QuestionType(str, Enum):
+    SINGLE = "single"
+    MULTIPLE = "multiple"
+    INPUT = "input"
 
 
 @dataclass
@@ -46,7 +53,7 @@ class Question:
     test_id: int
     text: str
     position: int = 0
-    question_type: str = "single"
+    question_type: QuestionType = QuestionType.SINGLE
     tg_file_id: str | None = None
 
 
diff --git a/src/trudex/infrastructure/database/config.py b/src/trudex/infrastructure/database/config.py
index 8b3bd0f..fba9003 100644
--- a/src/trudex/infrastructure/database/config.py
+++ b/src/trudex/infrastructure/database/config.py
@@ -1,5 +1,4 @@
-from sqlalchemy.ext.asyncio import (AsyncSession, async_sessionmaker,
-                                    create_async_engine)
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
 
 
 def new_session_maker(db_url: str) -> async_sessionmaker[AsyncSession]:
diff --git a/src/trudex/infrastructure/database/dao/question.py b/src/trudex/infrastructure/database/dao/question.py
index c67a60f..ac483c9 100644
--- a/src/trudex/infrastructure/database/dao/question.py
+++ b/src/trudex/infrastructure/database/dao/question.py
@@ -2,8 +2,9 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from trudex.domain.schemas import Question as DomainQuestion
+from trudex.domain.schemas import QuestionType
 from trudex.infrastructure.database.dto.question import QuestionDTO
-from trudex.infrastructure.database.models import Question, QuestionType
+from trudex.infrastructure.database.models import Question
 
 
 class QuestionDAO:
@@ -27,14 +28,16 @@ class QuestionDAO:
         test_id: int,
         text: str,
         position: int = 0,
-        question_type: str = "single",
+        question_type: str | QuestionType = QuestionType.SINGLE,
         tg_file_id: str | None = None,
     ) -> DomainQuestion:
+        if isinstance(question_type, str):
+            question_type = QuestionType(question_type)
         question = Question(
             test_id=test_id,
             text=text,
             position=position,
-            question_type=QuestionType(question_type),
+            question_type=question_type,
             tg_file_id=tg_file_id,
         )
         self.session.add(question)
@@ -47,7 +50,7 @@ class QuestionDAO:
         question_id: int,
         text: str | None = None,
         position: int | None = None,
-        question_type: str | None = None,
+        question_type: str | QuestionType | None = None,
         tg_file_id: str | None = None,
     ) -> DomainQuestion | None:
         result = await self.session.execute(
@@ -62,7 +65,9 @@ class QuestionDAO:
         if position is not None:
             question.position = position
         if question_type is not None:
-            question.question_type = QuestionType(question_type)
+            if isinstance(question_type, str):
+                question_type = QuestionType(question_type)
+            question.question_type = question_type
         if tg_file_id is not None:
             question.tg_file_id = tg_file_id
         
diff --git a/src/trudex/infrastructure/database/dao/test.py b/src/trudex/infrastructure/database/dao/test.py
index 6e3d326..2694653 100644
--- a/src/trudex/infrastructure/database/dao/test.py
+++ b/src/trudex/infrastructure/database/dao/test.py
@@ -1,4 +1,5 @@
 from datetime import datetime
+from typing import NotRequired, TypedDict, Unpack
 
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -8,6 +9,25 @@ from trudex.infrastructure.database.dto.test import TestDTO
 from trudex.infrastructure.database.models import Test
 
 
+class _UNSET:
+    """Sentinel для различения None и "не передано"."""
+    pass
+
+
+UNSET = _UNSET()
+
+
+class TestUpdateFields(TypedDict, total=False):
+    title: str
+    description: str | None
+    for_group: int | None
+    password: str | None
+    expires_at: datetime | None
+    attempts: int | None
+    is_active: bool
+    are_results_viewable: bool
+
+
 class TestDAO:
     def __init__(self, session: AsyncSession) -> None:
         self.session: AsyncSession = session
@@ -26,6 +46,16 @@ class TestDAO:
         models = list(result.scalars().all())
         return [TestDTO(model).to_domain() for model in models]
     
+    async def get_expired_active_tests(self, now: datetime) -> list[DomainTest]:
+        result = await self.session.execute(
+            select(Test)
+            .where(Test.is_active == True)
+            .where(Test.expires_at.isnot(None))
+            .where(Test.expires_at < now)
+        )
+        models = list(result.scalars().all())
+        return [TestDTO(model).to_domain() for model in models]
+    
     async def create(
         self,
         title: str,
@@ -55,14 +85,14 @@ class TestDAO:
     async def update(
         self,
         test_id: int,
-        title: str | None = None,
-        description: str | None = None,
-        for_group: int | None = None,
-        password: str | None = None,
-        expires_at: datetime | None = None,
-        attempts: int | None = None,
-        is_active: bool | None = None,
-        are_results_viewable: bool | None = None,
+        title: str | _UNSET = UNSET,
+        description: str | None | _UNSET = UNSET,
+        for_group: int | None | _UNSET = UNSET,
+        password: str | None | _UNSET = UNSET,
+        expires_at: datetime | None | _UNSET = UNSET,
+        attempts: int | None | _UNSET = UNSET,
+        is_active: bool | _UNSET = UNSET,
+        are_results_viewable: bool | _UNSET = UNSET,
     ) -> DomainTest | None:
         result = await self.session.execute(
             select(Test).where(Test.id == test_id)
@@ -71,21 +101,21 @@ class TestDAO:
         if not test:
             return None
         
-        if title is not None:
+        if not isinstance(title, _UNSET):
             test.title = title
-        if description is not None:
+        if not isinstance(description, _UNSET):
             test.description = description
-        if for_group is not None:
+        if not isinstance(for_group, _UNSET):
             test.for_group = for_group
-        if password is not None:
+        if not isinstance(password, _UNSET):
             test.password = password
-        if expires_at is not None:
+        if not isinstance(expires_at, _UNSET):
             test.expires_at = expires_at
-        if attempts is not None:
+        if not isinstance(attempts, _UNSET):
             test.attempts = attempts
-        if is_active is not None:
+        if not isinstance(is_active, _UNSET):
             test.is_active = is_active
-        if are_results_viewable is not None:
+        if not isinstance(are_results_viewable, _UNSET):
             test.are_results_viewable = are_results_viewable
         
         await self.session.flush()
diff --git a/src/trudex/infrastructure/database/dao/user.py b/src/trudex/infrastructure/database/dao/user.py
index 712e2f9..8b88842 100644
--- a/src/trudex/infrastructure/database/dao/user.py
+++ b/src/trudex/infrastructure/database/dao/user.py
@@ -8,6 +8,14 @@ from trudex.infrastructure.database.dto.user import UserDTO
 from trudex.infrastructure.database.models import User
 
 
+class _UNSET:
+    """Sentinel для различения None и "не передано"."""
+    pass
+
+
+UNSET = _UNSET()
+
+
 class UserDAO:
     def __init__(self, session: AsyncSession) -> None:
         self.session: AsyncSession = session
@@ -53,14 +61,14 @@ class UserDAO:
     async def update(
         self,
         user_id: int,
-        username: str | None = None,
-        first_name: str | None = None,
-        last_name: str | None = None,
-        name: str | None = None,
-        group: int | None = None,
-        is_admin: bool | None = None,
-        name_updated_at: datetime | None = None,
-        group_updated_at: datetime | None = None,
+        username: str | None | _UNSET = UNSET,
+        first_name: str | _UNSET = UNSET,
+        last_name: str | None | _UNSET = UNSET,
+        name: str | None | _UNSET = UNSET,
+        group: int | None | _UNSET = UNSET,
+        is_admin: bool | _UNSET = UNSET,
+        name_updated_at: datetime | None | _UNSET = UNSET,
+        group_updated_at: datetime | None | _UNSET = UNSET,
     ) -> DomainUser | None:
         result = await self.session.execute(
             select(User).where(User.id == user_id)
@@ -69,21 +77,21 @@ class UserDAO:
         if not user:
             return None
         
-        if username is not None:
+        if not isinstance(username, _UNSET):
             user.username = username
-        if first_name is not None:
+        if not isinstance(first_name, _UNSET):
             user.first_name = first_name
-        if last_name is not None:
+        if not isinstance(last_name, _UNSET):
             user.last_name = last_name
-        if name is not None:
+        if not isinstance(name, _UNSET):
             user.name = name
-        if group is not None:
+        if not isinstance(group, _UNSET):
             user.group = group
-        if is_admin is not None:
+        if not isinstance(is_admin, _UNSET):
             user.is_admin = is_admin
-        if name_updated_at is not None:
+        if not isinstance(name_updated_at, _UNSET):
             user.name_updated_at = name_updated_at
-        if group_updated_at is not None:
+        if not isinstance(group_updated_at, _UNSET):
             user.group_updated_at = group_updated_at
         
         await self.session.flush()
@@ -108,9 +116,9 @@ class UserDAO:
         first_name: str,
         username: str | None = None,
         last_name: str | None = None,
-        name: str | None = None,
-        group: int | None = None,
-        is_admin: bool | None = None,
+        name: str | None | _UNSET = UNSET,
+        group: int | None | _UNSET = UNSET,
+        is_admin: bool | _UNSET = UNSET,
     ) -> DomainUser:
         result = await self.session.execute(
             select(User).where(User.id == user_id)
@@ -118,17 +126,14 @@ class UserDAO:
         user = result.scalar_one_or_none()
         
         if user:
-            if username is not None:
-                user.username = username
-            if first_name is not None:
-                user.first_name = first_name
-            if last_name is not None:
-                user.last_name = last_name
-            if name is not None:
+            user.username = username
+            user.first_name = first_name
+            user.last_name = last_name
+            if not isinstance(name, _UNSET):
                 user.name = name
-            if group is not None:
+            if not isinstance(group, _UNSET):
                 user.group = group
-            if is_admin is not None:
+            if not isinstance(is_admin, _UNSET):
                 user.is_admin = is_admin
             await self.session.flush()
             await self.session.refresh(user)
@@ -139,7 +144,7 @@ class UserDAO:
             username=username,
             first_name=first_name,
             last_name=last_name,
-            name=name,
-            group=group,
-            is_admin=is_admin or False,
+            name=name if not isinstance(name, _UNSET) else None,
+            group=group if not isinstance(group, _UNSET) else None,
+            is_admin=is_admin if not isinstance(is_admin, _UNSET) else False,
         )
diff --git a/src/trudex/infrastructure/database/dto/question.py b/src/trudex/infrastructure/database/dto/question.py
index 6490f4b..a63bbbf 100644
--- a/src/trudex/infrastructure/database/dto/question.py
+++ b/src/trudex/infrastructure/database/dto/question.py
@@ -12,6 +12,6 @@ class QuestionDTO:
             test_id=self.model.test_id,
             text=self.model.text,
             position=self.model.position,
-            question_type=self.model.question_type.value,
+            question_type=self.model.question_type,
             tg_file_id=self.model.tg_file_id,
         )
diff --git a/src/trudex/infrastructure/database/dto/test_attempt.py b/src/trudex/infrastructure/database/dto/test_attempt.py
index 9fb3255..786eb38 100644
--- a/src/trudex/infrastructure/database/dto/test_attempt.py
+++ b/src/trudex/infrastructure/database/dto/test_attempt.py
@@ -1,6 +1,5 @@
 from trudex.domain.schemas import TestAttempt as DomainTestAttempt
-from trudex.infrastructure.database.models import \
-    TestAttempt as TestAttemptModel
+from trudex.infrastructure.database.models import TestAttempt as TestAttemptModel
 
 
 class TestAttemptDTO:
diff --git a/src/trudex/infrastructure/database/models.py b/src/trudex/infrastructure/database/models.py
index 890dd7a..2d18dca 100644
--- a/src/trudex/infrastructure/database/models.py
+++ b/src/trudex/infrastructure/database/models.py
@@ -1,11 +1,11 @@
 from datetime import datetime
-from enum import Enum
 from typing import final
 
-from sqlalchemy import (BigInteger, CheckConstraint, ForeignKey, Integer,
-                        String, Text, func)
+from sqlalchemy import BigInteger, CheckConstraint, ForeignKey, Integer, String, Text, func
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
+from trudex.domain.schemas import QuestionType
+
 
 class Base(DeclarativeBase):
     pass
@@ -40,15 +40,6 @@ class Group(Base):
     __table_args__ = (
         CheckConstraint("number >= 1000 AND number <= 9999", name="check_group_number"),
     )
-    __table_args__ = (
-        CheckConstraint("number >= 1000 AND number <= 9999", name="check_group_number"),
-    )
-
-
-class QuestionType(str, Enum):
-    SINGLE = "single"
-    MULTIPLE = "multiple"
-    INPUT = "input"
 
 
 @final
diff --git a/src/trudex/infrastructure/database/repo/__init__.py b/src/trudex/infrastructure/database/repo/__init__.py
index 1f6a9b8..3d25dad 100644
--- a/src/trudex/infrastructure/database/repo/__init__.py
+++ b/src/trudex/infrastructure/database/repo/__init__.py
@@ -1,6 +1,5 @@
 from trudex.infrastructure.database.repo.test import TestRepository
-from trudex.infrastructure.database.repo.test_attempt import \
-    TestAttemptRepository
+from trudex.infrastructure.database.repo.test_attempt import TestAttemptRepository
 from trudex.infrastructure.database.repo.user import UserRepository
 
 __all__ = ["TestRepository", "TestAttemptRepository", "UserRepository"]
diff --git a/src/trudex/infrastructure/database/repo/test_attempt.py b/src/trudex/infrastructure/database/repo/test_attempt.py
index 1ec61fa..4842e4e 100644
--- a/src/trudex/infrastructure/database/repo/test_attempt.py
+++ b/src/trudex/infrastructure/database/repo/test_attempt.py
@@ -9,8 +9,7 @@ from trudex.infrastructure.database.dao.test_attempt import TestAttemptDAO
 from trudex.infrastructure.database.dao.user_answer import UserAnswerDAO
 from trudex.infrastructure.database.dto.test_attempt import TestAttemptDTO
 from trudex.infrastructure.database.dto.user_answer import UserAnswerDTO
-from trudex.infrastructure.database.models import \
-    TestAttempt as TestAttemptModel
+from trudex.infrastructure.database.models import TestAttempt as TestAttemptModel
 from trudex.infrastructure.database.models import UserAnswer as UserAnswerModel
 from trudex.infrastructure.utils.timezone import now_msk_naive
 
@@ -176,8 +175,7 @@ class TestAttemptRepository:
         }
     
     async def get_most_difficult_questions(self, test_id: int, limit: int = 10) -> list[tuple[int, float]]:
-        from trudex.infrastructure.database.models import \
-            Question as QuestionModel
+        from trudex.infrastructure.database.models import Question as QuestionModel
         
         result = await self.session.execute(
             select(
diff --git a/src/trudex/infrastructure/di.py b/src/trudex/infrastructure/di.py
index fa4b406..e4706d3 100644
--- a/src/trudex/infrastructure/di.py
+++ b/src/trudex/infrastructure/di.py
@@ -1,5 +1,5 @@
-from collections.abc import AsyncIterable
 import logging
+from collections.abc import AsyncIterable
 
 from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from dishka import AsyncContainer, Provider, Scope, provide
@@ -14,8 +14,7 @@ from trudex.infrastructure.database.dao.test_attempt import TestAttemptDAO
 from trudex.infrastructure.database.dao.user import UserDAO
 from trudex.infrastructure.database.dao.user_answer import UserAnswerDAO
 from trudex.infrastructure.database.repo.test import TestRepository
-from trudex.infrastructure.database.repo.test_attempt import \
-    TestAttemptRepository
+from trudex.infrastructure.database.repo.test_attempt import TestAttemptRepository
 from trudex.infrastructure.database.repo.user import UserRepository
 from trudex.infrastructure.scheduling.tasks import deactivate_expired_tests
 from trudex.infrastructure.utils.config import Config
diff --git a/src/trudex/infrastructure/scheduling/tasks.py b/src/trudex/infrastructure/scheduling/tasks.py
index 5667ccb..85f91f7 100644
--- a/src/trudex/infrastructure/scheduling/tasks.py
+++ b/src/trudex/infrastructure/scheduling/tasks.py
@@ -1,15 +1,19 @@
+import logging
+
 from dishka import AsyncContainer
 
 from trudex.infrastructure.database.dao.test import TestDAO
 from trudex.infrastructure.utils.timezone import now_msk_naive
 
+logger = logging.getLogger(__name__)
 
-async def deactivate_expired_tests(container: AsyncContainer):
+
+async def deactivate_expired_tests(container: AsyncContainer) -> None:
     async with container() as request_container:
         test_dao = await request_container.get(TestDAO)
         
-        tests = await test_dao.get_all()
+        expired_tests = await test_dao.get_expired_active_tests(now_msk_naive())
         
-        for test in tests:
-            if test.expires_at and test.expires_at < now_msk_naive() and test.is_active:
-                await test_dao.update(test.id, is_active=False)
+        for test in expired_tests:
+            await test_dao.update(test.id, is_active=False)
+            logger.info("Деактивирован истёкший тест: id=%d, title=%s", test.id, test.title)
diff --git a/src/trudex/infrastructure/utils/bot_commands.py b/src/trudex/infrastructure/utils/bot_commands.py
index 15b73ab..d017f64 100644
--- a/src/trudex/infrastructure/utils/bot_commands.py
+++ b/src/trudex/infrastructure/utils/bot_commands.py
@@ -1,6 +1,5 @@
 from aiogram import Bot
-from aiogram.types import (BotCommand, BotCommandScopeAllPrivateChats,
-                           BotCommandScopeChat)
+from aiogram.types import BotCommand, BotCommandScopeAllPrivateChats, BotCommandScopeChat
 
 from trudex.infrastructure.database.repo.user import UserRepository
 from trudex.infrastructure.utils.config import Config
diff --git a/src/trudex/infrastructure/utils/broadcast.py b/src/trudex/infrastructure/utils/broadcast.py
index 06612aa..a30c35f 100644
--- a/src/trudex/infrastructure/utils/broadcast.py
+++ b/src/trudex/infrastructure/utils/broadcast.py
@@ -1,4 +1,5 @@
 import asyncio
+import logging
 from dataclasses import dataclass
 
 from aiogram import Bot
@@ -6,6 +7,8 @@ from aiogram.exceptions import TelegramBadRequest, TelegramForbiddenError
 
 from trudex.infrastructure.database.dao.user import UserDAO
 
+logger = logging.getLogger(__name__)
+
 
 @dataclass
 class BroadcastStats:
@@ -19,17 +22,20 @@ async def broadcast_message(bot: Bot, message_id: int, chat_id: int, user_dao: U
     success = 0
     failed = 0
     
+    logger.info("Starting broadcast: message_id=%d, total_users=%d", message_id, len(users))
+    
     for user in users:
         try:
             await bot.copy_message(chat_id=user.id, from_chat_id=chat_id, message_id=message_id)
             success += 1
         except TelegramForbiddenError:
+            logger.debug("Broadcast failed (forbidden): user_id=%d", user.id)
             failed += 1
-        except TelegramBadRequest:
-            failed += 1
-        except Exception:
+        except TelegramBadRequest as e:
+            logger.debug("Broadcast failed (bad request): user_id=%d, error=%s", user.id, e)
             failed += 1
         
         await asyncio.sleep(0.1)
     
+    logger.info("Broadcast completed: success=%d, failed=%d, total=%d", success, failed, len(users))
     return BroadcastStats(success=success, failed=failed, total=len(users))
diff --git a/src/trudex/infrastructure/utils/test_id_to_hash.py b/src/trudex/infrastructure/utils/test_id_to_hash.py
index 2d9b035..d5322a0 100644
--- a/src/trudex/infrastructure/utils/test_id_to_hash.py
+++ b/src/trudex/infrastructure/utils/test_id_to_hash.py
@@ -1,8 +1,7 @@
-import hmac
 import hashlib
+import hmac
 import string
 
-
 ALPHABET = string.ascii_letters
 
 def _feistel_round(val: int, key: bytes, rounds: int) -> int: