Not selfhosted/FOSS but I just checked one that I knew about from android and they do have a desktop version, maybe this is what you are looking for? Memento database. Source: about 1 year ago

I don't know if this is quite what you're looking for or not, but there's a program I use called Memento Database (https://mementodatabase.com/) that would probably work great for that. You could make a database with an entry for each person, and a tags field where you could tag them with various attributes, and then you can search for any tag or combination of tags. I do pay for their pro version (which includes... Source: about 2 years ago

The only decent app I ever found was not FOSS (Memento). I ended up using notebooks for each room (category) in Joplin. Source: about 2 years ago

I put together a little database for all this using Memento Database on my phone. Source: over 2 years ago

You might want to check out Momento Database. Not the most straightforward thing to learn, but once you have it set up it is easy to use. Lots of templates already built for project management, and you can attach files in various ways. Source: over 2 years ago

However! A determined user can still do something like load the app on a phone in an Android or iOS simulator, then watch all outgoing API calls and basically reverse-engineer how things work. This is how Teller wrote their system -- they loaded up bank apps onto a simulator and basically reverse-engineered the API for the various banks. Source: over 1 year ago

I haven’t used it and I couldn’t find their pricing, but there is also Teller. https://teller.io. Source: almost 2 years ago

Have you considered integration with a free api to import transactions? Source: over 2 years ago

Congrats on the launch! I'm the CEO and co-founder of https://teller.io that uses private mobile banking APIs to provide access to bank accounts too, and you're right it's the way to go. We don't think regulation or OAuth based APIs will ever yield an improvement on this approach (explained why here - https://blog.teller.io/2021/06/21/our-mission.html) You're going to quickly find out that these API endpoints are... - Source: Hacker News / over 2 years ago

I’d also check out https://teller.io as well. Source: over 2 years ago