The /1/ subfolder is the `step`. See `admin.revision_info`. The numbering of the scripts within the folder is so that, if there are multiple scripts required for a single `step`, they can be executed in sequence--so the numeric `01-blah.sql` matters. Separate scripts should be created for separate changes to the database (for example, unrelated or partially unrelated changes to the schema or data should be place in separate scripts and given an appropriate name).