fixed confusion about restoring mail/web-backup with same id

Dominik

2015-01-11 d2c52bba80df37187d2ce80c80290d6a1473a247

1
ALTER TABLE `client` ADD `customer_no` VARCHAR( 64 ) NULL AFTER `contact_name` , ADD `vat_id` VARCHAR( 64 ) NULL AFTER `customer_no`;