I have this newspaper subscription table;

db.define_table('business_and_financial_times',
    Field('subscription', 'boolean', default=False),
    Field('creation_date', 'date', default=now),
    
Field('subscription_option',requires=IS_IN_SET((['none','monthly','yearly']))),
    Field('days','integer',requires=IS_IN_SET(([0, 30, 365])), default=0),
    Field('subscription_date', 'date', default=now),
    
Field('payment_option',requires=IS_IN_SET((['...','...','...','....'])),default='None'),
    Field('payment_token'),
    Field('payment_process_time','time'),
    Field('subscriber', db.auth_user, default=auth.user_id))

i want to count down the days after a user subscribes to a newspaper and 
update the days left depending on 
the subscription option.

Field('days','integer',requires=IS_IN_SET(([0, 30, 365])), default=0),

I need help

thanks

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