Comment by engineerick

Thanks for the comment and suggestion on Postgres. I agree about the additional surface area of maintenance. However, the reason I used Redis was to become familiar with Redis in the Spring ecosystem. After writing in Python, Go, and Swift, I came back to Java and decided to become a strong Spring & Java developer. That's why I am writing Spring projects to solve different problems with different tech stacks. But now, because you mentioned it, I am interested in using Postgres as a message queue, and I will definitely try it in my future projects.