Erwin Brandstetter wrote:

- Trying to add a comment to UNIQUE CONSTRAINT fails altogether.

Actually, it doesn't fail to write. It just doesn't show up anywhere in pgadmin afterwards.

psql doesn't seem to have a meta-command to retrieve comments on constraints. But checking by OID with "obj_description" reveals it:
   SELECT obj_description(2666870, 'pg_constraint');


Regards
Erwin

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
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