WITH
    preparedData as (
        SELECT
            p.userID,
      p.productID,
      pr.productValue,
            paymentAmount,
            paymentPeriod,
            paymentDateTime,
            DATE_TRUNC(DATETIME(paymentDateTime), MONTH) as prepaidPeriodStart,
      DATE_TRUNC(DATE_ADD(DATETIME(paymentDateTime), INTERVAL paymentPeriod MONTH), MONTH) as prepaidPeriodEnd,
      DATE_TRUNC(DATE_ADD(DATETIME(paymentDateTime), INTERVAL paymentPeriod MONTH), DAY) as prepaidPeriodEndDay,
            DATE_ADD(DATETIME(paymentDateTime), INTERVAL paymentPeriod MONTH) as prepaidPeriodEndDateTime
        FROM
            `uptimerobot-001.ur.payments` p

    LEFT JOIN
    `uptimerobot-001.ur.products` pr

      ON p.productID = pr.productID

        LEFT JOIN   (
            SELECT
                userID,
                MAX(paymentDateTime) lastPaymentDateTime
            FROM
                `uptimerobot-001.ur.payments`

            WHERE
                paymentStatus = 1
                AND paymentPeriod IN (1,12)
                AND userID IS NOT NULL
            GROUP BY
                userID
            ) lp
            ON p.userID =lp.userID AND p.paymentDateTime = lp.lastPaymentDateTime

        WHERE
            paymentStatus = 1
            AND paymentPeriod IN (1,12)
            AND p.userID IS NOT NULL
            AND lp.lastPaymentDateTime IS NOT NULL
    ),
    calendar as (
        SELECT
        DATE_TRUNC(DATETIME(paymentDateTime), DAY) as reportingYearMonthDay
        FROM `uptimerobot-001.ur.payments`
        GROUP BY
            reportingYearMonthDay
    )

  SELECT
        reportingYearMonthDay,
        COUNT(DISTINCT userID) churnedCustomers,
        (CASE
            WHEN DATE_ADD(reportingYearMonthDay, INTERVAL 17 DAY) >= CURRENT_DATE THEN 1
            WHEN DATE_ADD(reportingYearMonthDay, INTERVAL 17 DAY) < CURRENT_DATE THEN 0
        ELSE 99999999999999
        END) isGracePeriod

  FROM
    preparedData pd

    LEFT JOIN calendar cal
        ON pd.prepaidPeriodEndDateTime > reportingYearMonthDay AND pd.prepaidPeriodEndDay < DATE_ADD(cal.reportingYearMonthDay, INTERVAL 1 DAY)

    GROUP BY
        reportingYearMonthDay

    ORDER BY
        reportingYearMonthDay DESC