-- 设备在线状态仅由 Redis 在线集合和心跳维护；执行前确认所有应用实例已升级。
DELIMITER $$

DROP PROCEDURE IF EXISTS remove_device_status_columns $$
CREATE PROCEDURE remove_device_status_columns()
BEGIN
    DECLARE item_count INT DEFAULT 0;

    SELECT COUNT(*) INTO item_count
    FROM information_schema.columns
    WHERE table_schema = DATABASE() AND table_name = 'dock' AND column_name = 'status';
    IF item_count > 0 THEN
        ALTER TABLE dock DROP COLUMN status;
    END IF;

    SELECT COUNT(*) INTO item_count
    FROM information_schema.columns
    WHERE table_schema = DATABASE() AND table_name = 'drone' AND column_name = 'status';
    IF item_count > 0 THEN
        ALTER TABLE drone DROP COLUMN status;
    END IF;
END $$

CALL remove_device_status_columns() $$
DROP PROCEDURE remove_device_status_columns $$
DELIMITER ;