(I work at Retool.) We offer a self-hosted version of Retool if you're interested: https://retool.com/self-hosted/ The self-hosted option is also free for teams of up to 5 people under our new free plan.
(I work at Retool.) Appreciate the feedback! We are re-recording this video in the next few months. I'll make sure that we use better query names (and other best practices) in that video.