Recently I've tried to revive one of my old, interesting and - at least, for me - pretty clear question from closure. After editing the post and casting a reopen vote, unfortunately it seems I've hit a wall.
Vérace initially misunderstood the question:
Maybe you might want to search for a script to truncate all tables? This would be difficult to write on your own - it has to be done in the correct order - i.e. in grandchildren -> parents -> grandparent order, otherwise the truncates will fail. Not sure about
PROCEDUREs - but it might be a start. You will, of course, have to reload your entire database. If you can clarify this, I will vote to reopen.
...but offered a reopen vote after another clarification. I made it, but unfortunately it was left unreacted.
The most useful comment arrived from Colin 't Hart:
Depending on how many objects you have, a complete wipe and reinstall is probably going to be faster and give you a cleaner starting point. If you want to do this more than once, suggest you take a backup of the empty database. A file system copy or tar file taken while the instance is shutdown would be perfect for this sort of thing.
He even answered my question in a comment, demonstrating by his own actions that it is not unclear any more. And then, even he clicked "leave closed".
I suspect, maybe some other inherent problem is still there with this question, but somehow it wasn't clearly communicated until now.