Delegate user persistence to UserRepository

- Add create() and update() methods to UserRepository
- Update ProfileService to use repository.update()
- Update AuthService to use repository.create()

backend/repositories/user.py

@@ -30,3 +30,31 @@ class UserRepository:
             select(User.email).where(User.id == godfather_id)
         )
         return result.scalar_one_or_none()
+
+    async def create(self, user: User) -> User:
+        """
+        Create a new user record.
+
+        Args:
+            user: User instance to persist
+
+        Returns:
+            Created User record (flushed to get ID)
+        """
+        self.db.add(user)
+        await self.db.flush()
+        return user
+
+    async def update(self, user: User) -> User:
+        """
+        Update an existing user record.
+
+        Args:
+            user: User instance to update
+
+        Returns:
+            Updated User record (refreshed from database)
+        """
+        await self.db.commit()
+        await self.db.refresh(user)
+        return user

backend/services/auth.py

@@ -72,8 +72,8 @@ class AuthService:
         if default_role:
             user.roles.append(default_role)
 
-        self.db.add(user)
-        await self.db.flush()  # Get user ID
+        # Create user (flush to get ID)
+        user = await self.user_repo.create(user)
 
         # Mark invite as spent
         invite.status = InviteStatus.SPENT

backend/services/profile.py

@@ -68,8 +68,7 @@ class ProfileService:
         user.signal = data.signal
         user.nostr_npub = data.nostr_npub
 
-        await self.db.commit()
-        await self.db.refresh(user)
+        await self.user_repo.update(user)
 
         godfather_email = await self.user_repo.get_godfather_email(user.godfather_id)