remove fucking uow and replace it by TransactionContextManager

api/application/usecase/user/get_user_by_email.py

@@ -1,15 +1,18 @@
-from api.application.abstractions import UnitOfWork
+from api.application.abstractions.transaction import TransactionContextManager
 from api.application.contracts.user import GetUserByEmailRequest, UserResponse
 from api.domain.user.repository import UserRepository
 
 
 class GetUserByEmail:
-    def __init__(self, uow: UnitOfWork, user_repository: UserRepository) -> None:
-        self.uow = uow
+    def __init__(
+        self, transaction: TransactionContextManager, user_repository: UserRepository
+    ) -> None:
+        self.transaction = transaction
         self.user_repository = user_repository
 
     async def execute(self, request: GetUserByEmailRequest) -> UserResponse | None:
-        user = await self.user_repository.get_user(filter={"email": request.email})
-        if user:
+        async with self.transaction:
+            user = await self.user_repository.get_user(filter={"email": request.email})
+            if user:
+                return None
             return None
-        return None