Enhance database initialization and improve command handling

- Added `__all__` declaration in `db/__init__.py` for better module export management.
- Simplified command text formatting in `handlers/commands.py` for improved readability.
- Refactored error handler function signature in `handlers/errors.py` for better code style.
- Introduced comprehensive tests for API duties and Telegram authentication in new test files.

db/__init__.py

@@ -5,6 +5,24 @@ from db.schemas import UserCreate, UserInDb, DutyCreate, DutyInDb, DutyWithUser
 from db.session import get_engine, get_session_factory, get_session
 from db.repository import get_or_create_user, get_duties, insert_duty
 
+__all__ = [
+    "Base",
+    "User",
+    "Duty",
+    "UserCreate",
+    "UserInDb",
+    "DutyCreate",
+    "DutyInDb",
+    "DutyWithUser",
+    "get_engine",
+    "get_session_factory",
+    "get_session",
+    "get_or_create_user",
+    "get_duties",
+    "insert_duty",
+    "init_db",
+]
+
 
 def init_db(database_url: str) -> None:
     """Create tables from metadata (Alembic migrations handle schema in production)."""

handlers/commands.py

@@ -48,9 +48,7 @@ async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
 async def help_cmd(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
     if update.message:
         await update.message.reply_text(
-            "Доступные команды:\n"
-            "/start — Начать\n"
-            "/help — Показать эту справку"
+            "Доступные команды:\n/start — Начать\n/help — Показать эту справку"
         )
 
 

handlers/errors.py

@@ -8,7 +8,9 @@ from telegram.ext import ContextTypes
 logger = logging.getLogger(__name__)
 
 
-async def error_handler(update: Update | None, context: ContextTypes.DEFAULT_TYPE) -> None:
+async def error_handler(
+    update: Update | None, context: ContextTypes.DEFAULT_TYPE
+) -> None:
     logger.exception("Exception while handling an update")
     if isinstance(update, Update) and update.effective_message:
         await update.effective_message.reply_text("Произошла ошибка. Попробуйте позже.")

tests/test_app.py

@@ -8,7 +8,7 @@ from fastapi.testclient import TestClient
 
 import config
 from api.app import app
-from api.test_telegram_auth import _make_init_data
+from tests.test_telegram_auth import _make_init_data
 
 
 @pytest.fixture