Describe the bug
We have observed some cases of item UUIDs occurring multiple times in the workspace item table. This causes for failures in the backend when we’re trying to retrieve the workspace item bound to a certain item as the backend doesn’t ever support retrieving two workspace items for one item.

To Reproduce
Calling WorkspaceItemServiceImpl#create two times (or more) in succession for the same WorkflowItem results in multiple entries in the table referring to the same Item.

Expected behavior
The above steps should result in exactly one extra entry in the table, and an exception thrown on the second and subsequent attempts.

Related work
Pull request