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Since commit 3a9b18b309, roles with privileges of pg_signal_backend cannot signal autovacuum workers. Many users treated the ability to signal autovacuum workers as a feature instead of a bug, so we are reintroducing it via a new predefined role. Having privileges of this new role, named pg_signal_autovacuum_worker, only permits signaling autovacuum workers. It does not permit signaling other types of superuser backends. Bumps catversion. Author: Kirill Reshke Reviewed-by: Anthony Leung, Michael Paquier, Andrey Borodin Discussion: https://postgr.es/m/CALdSSPhC4GGmbnugHfB9G0%3DfAxjCSug_-rmL9oUh0LTxsyBfsg%40mail.gmail.com