USE billing;

ALTER TABLE contracts
  DROP COLUMN invoice_email_template_id;
ALTER TABLE email_templates modify reseller_id int(11) unsigned not null;

delete from email_templates where reseller_id is null and name='subscriber_default_email'; 
delete from email_templates where reseller_id is null and name='passreset_default_email'; 
delete from email_templates where reseller_id is null and name='invoice_default_email';