Hi!
I think it's good idea to able create subscription for database owner, but owner do not have permission on all tables
indatabase.
At the begging Stephen Frost said about table filter at subscription side.
https://www.postgresql.org/message-id/20181106215244.GH18594%40tamriel.snowman.net
I can add additional check in create subscription for database owner.
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Efimkin Evgeny