I would absolutely love to be able to query this month's budget for a given category. For example, being able to ask the API for my "Food" budget for the month and have a response that details what my budget _is_ for the month, and what I've spent against that budget for the month. Basically I want the data available here: https://my.lunchmoney.app/budget/2021/01?category=138420 via the API!

Useful for users building out their own native apps for Lunch Money. We don't want to always be relying on a singular developer token!

Right now, only POST transactions updates the account balance. If we're updating a single transaction, it doesn't update the account balance accordingly.

Return more descriptive error messages so users can figure out what's going wrong

It would be useful to be able to grab a year's worth of recurring transactions instead of month by month.