Kurt, Thanks for your suggestions. Although I'm worried whether it'll be enough to just delete the relevant files (this was originally on SQL, the DB has since then been upgraded to HANA). There's no useful SAP documentation on this - they basically just state that uninstallation is the responsibility of the 3rd party provider of the add-on 😠 (And, of course, the SAP basis team never thought to keep any of the original documentation that came with the software...) Anyways, it's worth trying to delete the installation in the sandbox and seeing what happens.
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