mail-backup: Make sure backup_interval is a string, not an integer.

Florian Schaal

2014-03-05 d9443da5f7186cae3f7235e1d51c966ba2b68206

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ALTER TABLE `web_domain` ADD `last_quota_notification` DATE NULL DEFAULT NULL;
ALTER TABLE `mail_user` ADD `last_quota_notification` DATE NULL DEFAULT NULL;