There's many many ways to make a message queue these days - all the main SQL databases can act as a queue - everything from Postgres to MS SQL server to MySQL t

There's many many ways to make a message queue these days - all the main SQL databases can act as a queue - everything from Postgres to MS SQL server to MySQL to Oracle to sqlite to the custom applications like Kafka and for the most part they are all more or less valid - it's not all about Postgres. Take the approach that appeals to you and feel happy about it without big open source telling you "you're holding it wrong!"