On: Event Sourcing (2005)

[timClicks]

Start with very granular events. They can be aggregated later if needed, but the reverse isn't possible.

[rphln → timClicks]

Isn't it the other way around? If you have an “AB” event, it's fairly trivial to go through the log and split it into “A then B”. If you have “A then C then B” for whatever reason and then realize that you need to aggregate “A” and “B”, that is much harder.