-- Step 1: generate dates using a numbers table (0 to 17 for 15 past + today + 2 future)
SELECT
    DATE(DATE_ADD(CURDATE(), INTERVAL n.n - 15 DAY)) AS jam_day,
    COALESCE(SUM(CASE WHEN a.category = 'Inbound_jam' THEN 1 ELSE 0 END), 0) AS Inbound_jam,
    COALESCE(SUM(CASE WHEN a.category = 'Sorter_jam' THEN 1 ELSE 0 END), 0) AS Sorter_jam
FROM (
    SELECT 0 AS n UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3
    UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7
    UNION ALL SELECT 8 UNION ALL SELECT 9 UNION ALL SELECT 10 UNION ALL SELECT 11
    UNION ALL SELECT 12 UNION ALL SELECT 13 UNION ALL SELECT 14 UNION ALL SELECT 15
    UNION ALL SELECT 16 UNION ALL SELECT 17
) AS n
LEFT JOIN (
    SELECT
        DATE(ae.eventtime) AS event_day,
        CASE 
            WHEN m.category IS NOT NULL THEN m.category
            ELSE 'Unknown'
        END AS category
    FROM alarm_events ae
    JOIN (
        SELECT 'UL15_1_TPE1' AS device, 'Inbound_jam' AS category UNION ALL
        SELECT 'UL14_1_TPE1', 'Inbound_jam' UNION ALL
        SELECT 'PS3_1_TPE1', 'Inbound_jam' UNION ALL
        SELECT 'PS3_1_TPE2', 'Inbound_jam' UNION ALL
        SELECT 'PS3_1_TPE3', 'Inbound_jam' UNION ALL
        SELECT 'PS3_2_TPE1', 'Inbound_jam' UNION ALL
        SELECT 'PS3_4_TPE1', 'Inbound_jam' UNION ALL
        SELECT 'PS3_8_TPE1', 'Inbound_jam' UNION ALL
        SELECT 'PS3_10_TPE1', 'Inbound_jam' UNION ALL
        SELECT 'PS3_12_TPE1', 'Sorter_jam'
    ) AS m ON ae.displaypath = m.device
    WHERE ae.eventtype = 0
      AND ae.eventtime BETWEEN DATE_SUB(CURDATE(), INTERVAL 15 DAY)
                           AND DATE_ADD(CURDATE(), INTERVAL 2 DAY)
      AND ae.displaypath NOT LIKE '%System Startup%'
      AND ae.source NOT LIKE '%System Startup%'
) AS a ON DATE(DATE_ADD(CURDATE(), INTERVAL n.n - 15 DAY)) = a.event_day
GROUP BY jam_day
ORDER BY jam_day ASC;