An event of a change carries the record, the version it follows and the event as its message id; the last version sent per
record is a key of the state sent; at start the events of the operations after it are sent again under the same ids, so a
stop between an operation and its event loses none and a second start sends none.
Issue 1966.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
