duration_unit enum('day', 'month', 'week', 'year') DEFAULT 'year' ,
duration_interval int COMMENT 'Number of units for total duration of subscription, service, membership (e.g. 12 Months).',
frequency_unit enum('day', 'month', 'week', 'year') DEFAULT 'month' COMMENT 'Frequency unit and interval allow option to store actual delivery frequency for a subscription or service.',
duration_unit enum('day', 'month', 'week', 'year') DEFAULT 'year' ,
duration_interval int COMMENT 'Number of units for total duration of subscription, service, membership (e.g. 12 Months).',
frequency_unit enum('day', 'month', 'week', 'year') DEFAULT 'month' COMMENT 'Frequency unit and interval allow option to store actual delivery frequency for a subscription or service.',