Every edit to a dataset or Evaluator config is saved as a new version - diffed against what changed ("Updated acceptance criteria, questions"), shown newest-first with a v{N} badge, browsable from a Version history panel in the edit dialog. Click Apply this version to pull an older version’s fields back into the form (you still have to hit Save to actually restore it - this doesn’t overwrite anything on its own), or Delete to remove a specific version from the log. The very first save is always recorded too ("Created"), so a freshly-made dataset never shows an empty history. A no-op save (open the dialog, change nothing, hit Save) doesn’t create a new version - only genuine field changes do.
