Arvados

psql:/home/peter/work/arvados/services/api/db/structure.sql:22: ERROR:  must be owner of extension plpgsql

By now we've all gotten used to ignoring this warning, but it confuses new contributors/installers, and I don't think we are even using the "plpgsql" extension (I believe it was being used for a special case of partial indexes on name links a long time ago, which we stopped doing after #3036.) we've never really cared what the "comment on extension plpgsql" is -- it's just boilerplate that comes with rake db:structure:dump:

COMMENT ON EXTENSION plpgsql IS 'PL/pgSQL procedural language';