Function reject_one_shot 

pub fn reject_one_shot(
    be: &mut impl SessionBackend,
    client_id: &str,
    mid: u64,
) -> Result<SqlTxnOutput, SessionError>

Process a client mutation as an explicit no-op: apply no user statements, but advance its LMID in the same captured commit. Replays absorb and gaps reject through the same admission function as execute_one_shot and interactive session begin.