* Implement Synth as an exchange rate provider
* Add assertions to provider interface test
* Assert the correct provider error is raised
* Remove unnecessary parens
* feat: add crypto account type to demo data
* fix: set currency to BTC, revert schema migration change and fix tests
* fix: update dates in time_series tests
* Clean up time series models
* Add value group rollup class for summarizing hierarchical data
* Integrate new classes
* Update UI to use new patterns
* Update D3 charts to expect new data format
* Clean up account model
* More cleanup
* Money improvements
* Use new money fields
* Remove invalid fixture data to avoid orphaned accountables
* Update time series to work better with collections
* Fix tests and UI bugs
* Fix accountable type references in new account flow
* Add remaining references
* Refactor accountable type checking
* Refactor new account template to use account
* Refactor account create action
* Refactor account sidebar
