If you're still monitoring and have the time @JC5, I was just curious about your data model.

I see that there tags, categories, and budgets. I understand the differences between these, and why they are presented as different concepts. How did these different features evolve? Did you have budgets first, then categories/tags? Did you ever consider implementing categories as tags and not having a separate category concept?

Just wondering if what you have now evolved from a simpler model (at least fewer concepts—maybe not simpler implementation or mental model), and if so why/how.