first commit

app/bot/middlewares/database.py

@@ -0,0 +1,28 @@
+from typing import Any, Awaitable, Callable
+
+from aiogram import BaseMiddleware
+from aiogram.types import TelegramObject
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
+
+
+class DbSessionMiddleware(BaseMiddleware):
+    """Opens one SQLAlchemy async session per update; commits on success."""
+
+    def __init__(self, session_factory: async_sessionmaker[AsyncSession]) -> None:
+        self._session_factory = session_factory
+
+    async def __call__(
+        self,
+        handler: Callable[[TelegramObject, dict[str, Any]], Awaitable[Any]],
+        event: TelegramObject,
+        data: dict[str, Any],
+    ) -> Any:
+        async with self._session_factory() as session:
+            data["session"] = session
+            try:
+                result = await handler(event, data)
+                await session.commit()
+                return result
+            except Exception:
+                await session.rollback()
+                raise