Yes, this is a killer feature. There are many instances of what are essentially application side caches that try (and often fail) to do this; its non-trivial to

Yes, this is a killer feature. There are many instances of what are essentially application side caches that try (and often fail) to do this; its non-trivial to do right, and I am greatly looking forwards to it. In particular, an event-sourced world becomes much easier to implement and maintain with the DB handling all the incremental magic.