feat: Add unique constraint on sound hash and update related tests

tests/repositories/test_user_oauth.py

@@ -18,7 +18,7 @@ class TestUserOauthRepository:
     async def user_oauth_repository(
         self,
         test_session: AsyncSession,
-    ) -> AsyncGenerator[UserOauthRepository, None]:  # type: ignore[misc]
+    ) -> AsyncGenerator[UserOauthRepository, None]:
         """Create a user OAuth repository instance."""
         yield UserOauthRepository(test_session)
 
@@ -28,6 +28,7 @@ class TestUserOauthRepository:
         test_user: User,
     ) -> int:
         """Get test user ID to avoid lazy loading issues."""
+        assert test_user.id is not None
         return test_user.id
 
     @pytest_asyncio.fixture
@@ -35,7 +36,7 @@ class TestUserOauthRepository:
         self,
         test_session: AsyncSession,
         test_user_id: int,
-    ) -> AsyncGenerator[UserOauth, None]:  # type: ignore[misc]
+    ) -> AsyncGenerator[UserOauth, None]:
         """Create a test OAuth record."""
         oauth_data = {
             "user_id": test_user_id,