INSERT INTO MRR_DATA
SELECT
    date(MAX(MONTHLY), '+1 months')  as MONTHLY
  , 0 as NEW_MRR
  , 0 as EXPANSION_MRR
  , 0 as DOWNGRADE_MRR
  , 0 as CHURN_MRR
FROM
    MRR_DATA
;
SELECT
      MONTHLY  as YM
  ,   sum(NEW_MRR) over(order by MONTHLY asc)
    + sum(EXPANSION_MRR) over(order by MONTHLY asc)
    - sum(DOWNGRADE_MRR) over(order by MONTHLY asc)
    - sum(CHURN_MRR) over(order by MONTHLY asc)
    as MRR
FROM
    MRR_DATA
ORDER BY
    YM asc
;