* Support all currencies, handle outside DB
* Remove currencies from seed
* Fix account balance namespace
* Set default currency on authentication
* Cache currency instances
* Implement multi-currency syncs with tests
* Series fallback, passing tests
* Fix conflicts
* Make value group concrete class that works with currency values
* Fix migration conflict
* Update tests to expect multi-currency results
* Update account list to use group method
* Namespace updates
* Fetch unknown exchange rates from API
* Fix date range bug
* Ensure demo data works without external API
* Enforce cascades only at DB level
* Rename account balance field for clarity
`original_balance` and `original_currency` may infer that these values are "original" to the account. In reality, they represent the "current" balance and currency on the account.
* Prepare fixture data for account sync testing
* Update to new field
* Fix conflicts
* Remove local schema change
