Comment by rwmj

I did read a very technical report about this which obviously now I can't find :-( My takeaways were: (1) They didn't bother with double-entry bookkeeping. (2) It was a distributed system which no one fully understood and was not based on any normal distributed system principles. (3) Developers made ad hoc changes to the code and even database to temporarily patch things up, even going so far as to hard-code database ids into special cases throughout the code.

Edit: I think this one: https://www.judiciary.uk/wp-content/uploads/2019/12/bates-v-... Also related article: https://www.benthamsgaze.org/2021/07/15/what-went-wrong-with...