I build a multi-currency personal-finance app. This is one of the first bugs I had to design my way out of — and it's one almost every multi-currency app I've tried still has. The symptom You spent 200 zł on groceries in March.
Source: [Dev.to](https://dev.to/sssselfmade/your-budgeting-app-is-lying-to-you-about-last-month-3kn8)