[CaptainZapp]

> I think Horizon was anything but simple.

Yes, you're probably right. But this is the part that really bugs me :

"The inquiry heard that in 2008, a glitch in a system called CABSProcess, which automatically summarises a post office’s transactions at around 7pm daily, resulted in users working at the same time having balancing issues."

This, for an accounting system is just fucking inexcusable!

I worked on a huge accounting project for a financial institution processing 2M account bookings per day (at that time, it's a lot more now). A lot of effort was put into the audit log (every booking was written to an append only log) and into the reconciliation process. When it was 20 Rappen off there was digging until the inconsistency was found.

That transactions are not completely isolated when that CABSProcess kicked in is just completely and uttelry inexcusable.