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Why do you need to do that...

https://www.postgresql.org/docs/9.0/sql-notify.html

Should be okay for 99% of needs no?

That sounds like you'd need to manually enumerate all possible queries you'd want to listen to and have all writers do the work of deciding which channels to update.

The idea of simply being able to listen to a query without any additional work sounds like it could be really attractive in certain situations.

"The idea of simply being able to listen to a query without any additional work sounds like it could be really attractive in certain situations."

Sounds a lot like RethinkDB changefeeds https://rethinkdb.com/docs/changefeeds/ maybe check that out first :^)

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