GP asked how this system deals with Kafka's at least once semantics. Pointing out that Kafka has at least once semantics is redundant. What GP was asking: what

GP asked how this system deals with Kafka's at least once semantics. Pointing out that Kafka has at least once semantics is redundant. What GP was asking: what happens if Kafka delivers the "item added" event twice, but the "item deleted" event only once? Do you end up with an invalid/unrecoverable state?