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Reason to store CI and term in backend was to make db fully independent snapshot, it was never meant to interfere with apply logic. Skip of CI was introduced for v2->v3 migration where we wanted to prevent it from decreasing when replaying wal in https://github.com/etcd-io/etcd/pull/5391. By mistake it was added to apply flow during refactor in https://github.com/etcd-io/etcd/pull/12855#commitcomment-70713670. Consistency index and term should only be negotiated and used by raft to make decisions. Their values should only driven by raft state machine and backend should only be responsible for storing them.