Beancount really is wonderful. I use it for my personal finances, but I also moved my local hackerspace (Hackerspace.Gent) to use it to keep track of everybody's bar accounts. The backend uses beancount as a library to manage stock and balances, so that the data has a single point of truth in the (public) ledger. We can then always run easy analysis using the command line tools to see how much profit we made from events, which categories of things sell well, etc. Further, the metadata support allows us to keep certain preferences (like who the members are, how they prefer their name displayed, etc) all in one place.

If anybody is interested, the code is open source:

Backend: https://github.com/0x20/backtab

Frontend: https://github.com/0x20/tab-ui

I'm not going to explicitly link to the data but it shouldn't be hard to find if you want to see it