fix: remaining ruff linting errors in services tests

- Remove unused os imports in conftest.py and test_ingest.py
- Remove unused Tag import in test_asset_management.py
- Remove unused ensure_tags_exist import in test_ingest.py
- Fix unused info2 variable in test_asset_management.py

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests-unit/assets_test/services/conftest.py

@@ -1,4 +1,3 @@
-import os
 import tempfile
 from pathlib import Path
 from unittest.mock import patch

tests-unit/assets_test/services/test_asset_management.py

@@ -2,7 +2,7 @@
 import pytest
 from sqlalchemy.orm import Session
 
-from app.assets.database.models import Asset, AssetInfo, Tag
+from app.assets.database.models import Asset, AssetInfo
 from app.assets.database.queries import ensure_tags_exist, add_tags_to_asset_info
 from app.assets.helpers import utcnow
 from app.assets.services import (
@@ -179,7 +179,7 @@ class TestDeleteAssetReference:
     def test_keeps_asset_if_other_infos_exist(self, mock_create_session, session: Session):
         asset = _make_asset(session)
         info1 = _make_asset_info(session, asset, name="info1")
-        info2 = _make_asset_info(session, asset, name="info2")
+        _make_asset_info(session, asset, name="info2")  # Second info keeps asset alive
         asset_id = asset.id
         session.commit()
 

tests-unit/assets_test/services/test_ingest.py

@@ -1,12 +1,11 @@
 """Tests for ingest services."""
-import os
 from pathlib import Path
 
 import pytest
 from sqlalchemy.orm import Session
 
 from app.assets.database.models import Asset, AssetCacheState, AssetInfo, Tag
-from app.assets.database.queries import ensure_tags_exist, get_asset_tags
+from app.assets.database.queries import get_asset_tags
 from app.assets.services import ingest_file_from_path, register_existing_asset
 
 

tests-unit/assets_test/services/test_tagging.py

@@ -2,7 +2,7 @@
 import pytest
 from sqlalchemy.orm import Session
 
-from app.assets.database.models import Asset, AssetInfo, Tag
+from app.assets.database.models import Asset, AssetInfo
 from app.assets.database.queries import ensure_tags_exist, add_tags_to_asset_info
 from app.assets.helpers import utcnow
 from app.assets.services import apply_tags, remove_tags, list_tags