I'm glad you like it!

As for Flask vs FastAPI - I think there's a constant tension between "novel" and "tried-and-true" solutions. Even in case of my project, we were considering Flask because it's a staple. But now, two project later, FastAPI became our go-to technology for handling APIs.

By the way, thanks for your insights about GraphQL! I haven't done much of it, but I'm definitely going to explore the topic.