- Replace local_session() calls with db_session fixture in tests
- Add @pytest.mark.asyncio decorators to async test functions
- Fix test_unpublish_shout.py to use proper test database setup
- Tests now use in-memory SQLite database with proper schema
- All test tables are created automatically via conftest.py fixtures
- Add oauth_db_session fixture for OAuth tests
- Add simple_user fixture for test data
- Fix TestModel constructor to avoid pytest warning
- Improve test isolation and cleanup
