Hi Rob, thank you for that. I hadn't thought of modelling a CQRS system like that, it's a really nice solution that solves a lot of problems. There's a lot of food for thought above and I appreciate you taking the time to lay it all out for me, and those reading.
The problem that I have is the statement that events, and I then assume that you mean commands also, are not necessarily immutable. Events happen in past tense. They are by definition immutable. A command is issued, whether or not anything happens because of it is irrelevant. The command was issued. Immutable.
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