Bring back fix for #1489396, unintentionally removed in another pull request

Aleksander Machniak

2013-10-30 03da10725c584e2b3273f8cf66a0b2a51aadd275

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-- Updates from version 0.8
 
ALTER TABLE `cache` DROP COLUMN `cache_id`;
ALTER TABLE `users` DROP COLUMN `alias`;
ALTER TABLE `identities` ADD INDEX `email_identities_index` (`email`, `del`);