You can only recover a deleted workflow project if the deletion was made via the TD Console. Unfortunately, if you delete a workflow project via the TD Toolbelt, it is unrecoverable.
TD Toolbelt (The Toolbelt is required to recover a deleted workflow project.)
- Create a workflow project using the same name as the deleted workflow project using TD Toolbelt.
$ td wf init <project name> - Upload the new project to Treasure Data using TD Toolbelt.
$ cd <project name>
$ td wf push <project name> - Check the project revision on the revision history on TD Console.
- Download the Project from TD Toolbelt by specifying the revision.
$ td wf download <project name> -r <revision id> - Upload the downloaded project to Treasure Data.
$ cd <download project>
$ td wf push <project name>