When storing financial data, I'd certainly go with some kind of event sourcing: store deltas / financial transactions, not counters. The counters are just a sum

When storing financial data, I'd certainly go with some kind of event sourcing: store deltas / financial transactions, not counters. The counters are just a sum over all deltas. If performance is an issue, you can make the counters available in a second database that's only for reading, and updated from the original deltas.