Hey Jonathan, so as a managed Postgres service there are a few limitations that we have to put in place.
What I’ll need to do is check in wth our Datastores team here to see what we can do here, obviously, via Docker you’d have full control of your PG instance but then you’d have to take care of backups etc
We currently aren’t able to provide the additional privileges here to allow you to modify the extension. If you’d like to do this, then we’d recommend a docker based service with a disk attached.
If you get a moment, would you be able to create a request for this in feedback.render.com? We can then prioritize this based on additional customer use cases and requests.