Can't be done (apart from database restore and/or partial restore and table hacking...)
Raised https://jira.atlassian.com/browse/GHS-6163 to implement deletions as soft delete.
There is a series of steps that involves
which is not supported, and most likely is going to disrupt other users. In short, you can't do it for the same reasons you weren't able to restore the whole database...
...It's true that there are projects in Jira; but they are merely a way to cut off issues, to tell them apart from other sections of work and to apply rules that are specific to that team (the schemes)....
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