WITH RECURSIVE rslt(YM, MRR) AS (
    SELECT MIN(MONTHLY), 0 FROM MRR_DATA
    UNION ALL
    SELECT DATE(YM, '+1 month'), MRR + (
        SELECT NEW_MRR + EXPANSION_MRR - DOWNGRADE_MRR - CHURN_MRR 
        FROM MRR_DATA 
        WHERE MONTHLY = rslt.YM
    )
    FROM rslt 
    WHERE YM < DATE((SELECT MAX(MONTHLY) FROM MRR_DATA), '+1 month')
)
SELECT * FROM rslt
ORDER BY YM ASC;