Postgres isn't 100% set up to let fully untrusted clients do stuff. For example, right now there is no access control around listen/notify. You'd have to do s

Postgres isn't 100% set up to let fully untrusted clients do stuff. For example, right now there is no access control around listen/notify. You'd have to do some baseline query pre-processing to be completely secure, which could be a non-trivial task depending on just what you want to let clients do. I've done it in read-only internal business apps though, it's great.