Comment by hommes-r

Here I feel that having the right tools is going to prevent this kind of drift from happening.

Double entry bookkeeping to make sure the mutations are sound and solving the floating point error by this simple trick: https://news.ycombinator.com/item?id=21687430.

All major fintech's use these two tricks to prevent them from fundamentally screwing up. Believe me I worked at a really big one ;)