Ignoring the tests, the first change was adding a single parent id column and the second "more complex" refactoring added few more hash columns to the table (af

Ignoring the tests, the first change was adding a single parent id column and the second "more complex" refactoring added few more hash columns to the table (after you've specified that you wanted them, i.e. not an open-ended question) Its a very impressive model, but I think we have different views on what is complex.