[Cards] Change all instances of uuid to key

test/conftest.py

@@ -99,7 +99,7 @@ def test_group(db_session):
 @pytest.fixture
 def test_card(db_session, test_group):
     """Create a test card."""
-    card = Card(uuid="test-uuid-123", group_id=test_group.id)
+    card = Card(key="test-key-123", group_id=test_group.id)
     db_session.add(card)
     db_session.commit()
     db_session.refresh(card)