I tested starting spicedb with this args

--datastore-conn-uri="postgres://postgres:password@localhost:5432/spicedb?sslmode=disable&plan_cache_mode=ffff

. It gave me this error.

Server error (FATAL: invalid value for parameter \"plan_cache_mode\": \"ffff\" (SQLSTATE 22024

But when i pass it with valid value like this.

--datastore-conn-uri="postgres://postgres:password@localhost:5432/spicedb?sslmode=disable&plan_cache_mode=force_custom_plan`?

Spicedb starts without complaining. I'm guessing pgx took the settings.