With DateTable as(
SELECT min(MRR_DATA.MONTHLY) AS YM,
0 AS MRR
FROM MRR_DATA
UNION ALL
SELECT
    date
    (
        datetime
        (
            (
              YM
            ),'+1 months'
        )
    ),
    MRR + (SELECT NEW_MRR + EXPANSION_MRR - DOWNGRADE_MRR - CHURN_MRR FROM MRR_DATA WHERE YM = MONTHLY)

FROM
    DateTable
WHERE
    YM
    BETWEEN
    (
        SELECT min(MRR_DATA.MONTHLY) FROM MRR_DATA
    )
    AND
    (
        SELECT date(max(MRR_DATA.MONTHLY)) FROM MRR_DATA
    )

)

SELECT *
FROM DateTable