fixed issue with delete mail-backups when removing a email-user / email-domain

Florian Schaal

2015-01-16 55c012f85a6768b2e6a918de3a4f8bba6fd8cc6e

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ALTER TABLE `dns_rr` CHANGE `data` `data` TEXT NOT NULL DEFAULT '';
ALTER TABLE  `web_domain` DROP INDEX `serverdomain`, ADD UNIQUE  `serverdomain` (  `server_id` , `ip_address`, `domain` );