Any graphql library would work. I like async-graphql except compilation is a bear due to all the macros. We wired LISTEN up to subscriptions using tokio mpmc channels. It was a great moment of "fearless concurrency", it all just worked.

I like 'async-graphql'. I tried 'juniper' but, at the time, it didn't have as many features. That may have changed over the last year or so since I looked at it.