I manage all of my finances with Beancount (https://github.com/beancount/beancount). It has a native document store and I primarily use it to archive all of my statements to share with my accountants via Fava (https://github.com/beancount/fava). It’s not pretty, but it’s all in one (local) git repo.

Language models are great at turning those statements into Beancount postings and fixing errors, but the local ones not so much yet.