## Summary
- backfill Coinbase portfolio balances for 12 previous months plus today
- retry missing historical backfill on later syncs
- add Coinbase candle pricing with USD fallback and mark Coinbase
accounts as investments
## Tests
- php artisan test --compact
tests/Feature/OpenBanking/CoinbaseBalanceSyncTest.php
tests/Feature/OpenBanking/AccountMappingTest.php
tests/Feature/OpenBanking/CoinbaseControllerTest.php