-record(repl,
        {
          last_received_lsn :: integer() | undefined,
          last_flushed_lsn :: integer() | undefined,
          last_applied_lsn :: integer() | undefined,
          feedback_required :: boolean() | undefined,
          cbmodule :: module() | undefined,
          cbstate :: any() | undefined,
          receiver :: pid() | undefined,
          align_lsn :: boolean() | undefined
        }).