It is very useful to view and revert a historical version. As all historical versions are already available in the database.

Suggestion

• Allow designers to see previous workflow definition versions
• Allow deleting of a historical version
  => e.g. very useful if there ia historical version with hardcoded credentials.
• Allow opening a selected historical version
  => its handy to allow getting some information from previous versions, it should be clear that user has opened a historical version
• Allow reverting a selected historical version
  => Create new historical version from current draft, make the reverted version as current draft.

UI/UX Suggestions

• Please think a long and provide some suggestions as well.
• Add a tab to proces definition in side panel where these functionalities are added.
• Show the user that a historical version (not the active draft/published version) is open, e.g. by changing the bottom-down actions: Revert, Delete, Export, Import, (remove publish). Also show the version information next to the action button.