Just a reminder for those of us who’ve been using Devonthink for thousands of years and who forget to check up on the new features which keep on being added 
I used to use the Rename > Prefix / Suffix / Regex scripts a lot, though one or two of them disappeared a while back.
Instead of seeing how they’d been replaced by new features, I’ve just been putting them back on the menu and muttering quietly.
Embarrassingly, I’ve only just noticed the Tools > Batch Process command, and it turns out that you can do most of what’s in the Rename scripts with this. Obviously, it doesn’t replaced the Rename > Regex version, but still, very useful.
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Highlight the files you want to change.
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Select ‘Change Name’ in the first dropdown, and then add the Prefix and/or Suffix you want in front/behind the blue-lozenged Name entry.
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Press Enter.
It’s taken me over two years to notice this feature.
Oops…