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

tests/repositories/test_sound.py

@@ -17,7 +17,7 @@ class TestSoundRepository:
     async def sound_repository(
         self,
         test_session: AsyncSession,
-    ) -> AsyncGenerator[SoundRepository, None]:  # type: ignore[misc]
+    ) -> AsyncGenerator[SoundRepository, None]:
         """Create a sound repository instance."""
         yield SoundRepository(test_session)
 
@@ -25,7 +25,7 @@ class TestSoundRepository:
     async def test_sound(
         self,
         test_session: AsyncSession,
-    ) -> AsyncGenerator[Sound, None]:  # type: ignore[misc]
+    ) -> AsyncGenerator[Sound, None]:
         """Create a test sound."""
         sound_data = {
             "name": "Test Sound",
@@ -47,7 +47,7 @@ class TestSoundRepository:
     async def normalized_sound(
         self,
         test_session: AsyncSession,
-    ) -> AsyncGenerator[Sound, None]:  # type: ignore[misc]
+    ) -> AsyncGenerator[Sound, None]:
         """Create a normalized test sound."""
         sound_data = {
             "name": "Normalized Sound",
@@ -76,7 +76,9 @@ class TestSoundRepository:
         test_sound: Sound,
     ) -> None:
         """Test getting sound by ID when it exists."""
-        sound = await sound_repository.get_by_id(test_sound.id)
+        sound_id = test_sound.id
+        assert sound_id is not None
+        sound = await sound_repository.get_by_id(sound_id)
 
         assert sound is not None
         assert sound.id == test_sound.id
@@ -240,6 +242,7 @@ class TestSoundRepository:
         await sound_repository.delete(sound)
 
         # Verify sound is deleted
+        assert sound_id is not None
         deleted_sound = await sound_repository.get_by_id(sound_id)
         assert deleted_sound is None
 
@@ -353,7 +356,7 @@ class TestSoundRepository:
         sound_repository: SoundRepository,
         test_sound: Sound,
     ) -> None:
-        """Test creating sound with duplicate hash is allowed."""
+        """Test creating sound with duplicate hash should fail."""
         # Store the hash to avoid lazy loading issues
         original_hash = test_sound.hash
         
@@ -368,9 +371,6 @@ class TestSoundRepository:
             "is_normalized": False,
         }
 
-        # Should succeed - duplicate hashes are allowed
-        duplicate_sound = await sound_repository.create(duplicate_sound_data)
-        
-        assert duplicate_sound.id is not None
-        assert duplicate_sound.name == "Duplicate Hash Sound"
-        assert duplicate_sound.hash == original_hash  # Same hash is allowed
+        # Should fail due to unique constraint on hash
+        with pytest.raises(Exception):  # SQLAlchemy IntegrityError or similar
+            await sound_repository.create(duplicate_sound_data)