Well, it has the same issues as COMMENT ON DATABASE, which we support, though crudely.
Perhaps we should think about creating a shared version of pg_description so we could have more reasonable support for comments on shared objects. I'm not in a hurry for this but it would be a reasonable TODO item.
Just add a comment text column to the databases, users, groups and tablespaces tables. Then special case them in obj_description.
Chris
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