this is basically supabase. their entire stack (and product) can be hosted as a series of something like 10+ docker containers:

https://supabase.com/docs/guides/self-hosting/docker

however, like always, 'complexity has to live somewhere'. I doubt even Opus 4.5 could handle this. as soon as you get into database records themselves, context is going to blow up and you're going to have a bad time