ALTER TABLE `priv_msgs`
ADD `from_delete` tinyint(1) unsigned NOT NULL default '1',
ADD `from_save` tinyint(1) unsigned NOT NULL default '0',
ADD `to_delete` tinyint(1) unsigned NOT NULL default '0',
ADD `to_save` tinyint(1) unsigned NOT NULL default '0',
ADD INDEX `prune` (`msg_time`, `read_msg`, `from_save`, `to_delete`);
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