MAINT: Add todo for more query tests

test/test_transaction.cpp

@@ -531,4 +531,7 @@ TEST(test_transaction, test_query) {
             new_entity.GetId());
 }
 
+// TODO(fspreck) Add tests for unique queries, count queries, and mixed
+// transactions (FIND + RetrieveById, COUNT + RetrieveById).
+
 } // namespace caosdb::transaction