Shared clusters use uuid-ossp for uuid generation, while this covers projects where older kinds of uuids are being used this leaves out custom ID's like nanoids or UUIDv7. Normally one would add such ID via an CREATE FUNCTION statement like https://gist.github.com/kjmph/5bd772b2c2df145aa645b837da7eca74 but those statements are forbidden on shared instances.

Support for custom ID's could be added by easing the CREATE FUNCTION filter and allowing IMMUTABLE STRICT LEAKPROOF functions