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The Change message triggers the Annotations worker, which runs asynchronously with respect to the Client's request. It checks that the etag in the message matches the one in the repository service, to prevent against acting on "stale" Change messages. If the etags match, it runs a diff between the true state of the Evaluation's submission annotations (stored in the SubmissionStatus tables) and the state within the annotation query tables. Any differences are corrected in a single transaction.
