On page 526 you are showing a CreateAuction request. This command and the events generated after that command completely skip the Domain model. If the Business wants to know the creator and any change to the auction details (in eBay you can make changes to the auction until the bid starts) should there be a CreateAuction and UpdateAction commands and the logging of the events too? What I meant by logging is that storing those commands and events in the events store.

If it helps, you can see the full code for that example on github https://github.com/elbandit/PPPDDD/b...ion/Auction.cs.

To answer your question, yes I would definitely store events in the event store that the business needs to be aware of. So if there is an UpdateAuction command, then you would store an event indicating what happened - e.g. AuctionUpdated - in the event store.