I've run into schema issues specifically with things like supabase: the huge benefit to supase is really fast and effortless prototyping. But after that actually maintaining your app becomes really hard and you pay the tax back over time.

In this regard, once past prototyping, i agree i've never had issues with LLMs running into schema problems, given they're doing a full feature, they're in line with how things need to change across the app.

LLMs do great at inspecting tables via Rails models and db adapters that can run sql commands to inspect all schema.