This looks like a pretty cool project. I would love to try it out once your servers cool down, particularly your API. I'm playing around with APIs for Harvest and Freshbooks now. Full disclosure: I created a minimalist time tracking tool for freelancers/agency folks that lowers the barrier to logging your work:
https://timestreamapp.com/
It's not for everyone, but it resonates with some folks (the minimalist UI + keyboard driven nature and available CLI).