These are somewhat obscure PostgreSQL SQL commands: https://www.postgresql.org/docs/15/sql-listen.html https://www.postgresql.org/docs/15/sql-listen.html http

These are somewhat obscure PostgreSQL SQL commands: https://www.postgresql.org/docs/15/sql-listen.html https://www.postgresql.org/docs/15/sql-listen.html https://www.postgresql.org/docs/15/sql-notify.html https://www.postgresql.org/docs/15/sql-notify.html I think they have been around for ages, but handling the LISTEN responses may need special client library support.