Simon Willison's github would be a great place to get started imo -

https://github.com/simonw/datasette https://github.com/simonw/sqlite-utils

So, his code might not be a good place to find best patterns (for ex, I don't think they are fully typed), but his repos are very pragmatic, and his development process is super insightful (well documented PRs for personal repos!). Best part, he blogs about every non-trivial update, so you get all the context!