If you want more data that what you can probably get from Google Sheets easily, an alternative could be modifying this script to make it output a Beancount[0]-formatted ledger text file. The format is pretty readable plain-text (and so you could store it on Git to track changes easily) and you can generate nice reports out of it with the Beancount CLIs and a web interface with Fava[1]. Also adds another additional level of self-hosted :)

Also Beancount has some nice support for implementing importer scripts inside it if need be, although I haven't played with those yet.

[0] http://furius.ca/beancount/ [1] https://beancount.github.io/fava/