--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SQL/mysql/2013061000.sql	Thu Jan 04 15:52:31 2018 -0500
@@ -0,0 +1,24 @@
+ALTER TABLE `cache` ADD `expires` datetime DEFAULT NULL;
+ALTER TABLE `cache_shared` ADD `expires` datetime DEFAULT NULL;
+ALTER TABLE `cache_index` ADD `expires` datetime DEFAULT NULL;
+ALTER TABLE `cache_thread` ADD `expires` datetime DEFAULT NULL;
+ALTER TABLE `cache_messages` ADD `expires` datetime DEFAULT NULL;
+
+-- initialize expires column with created/changed date + 7days
+UPDATE `cache` SET `expires` = `created` + interval 604800 second;
+UPDATE `cache_shared` SET `expires` = `created` + interval 604800 second;
+UPDATE `cache_index` SET `expires` = `changed` + interval 604800 second;
+UPDATE `cache_thread` SET `expires` = `changed` + interval 604800 second;
+UPDATE `cache_messages` SET `expires` = `changed` + interval 604800 second;
+
+ALTER TABLE `cache` DROP INDEX `created_index`;
+ALTER TABLE `cache_shared` DROP INDEX `created_index`;
+ALTER TABLE `cache_index` DROP `changed`;
+ALTER TABLE `cache_thread` DROP `changed`;
+ALTER TABLE `cache_messages` DROP `changed`;
+
+ALTER TABLE `cache` ADD INDEX `expires_index` (`expires`);
+ALTER TABLE `cache_shared` ADD INDEX `expires_index` (`expires`);
+ALTER TABLE `cache_index` ADD INDEX `expires_index` (`expires`);
+ALTER TABLE `cache_thread` ADD INDEX `expires_index` (`expires`);
+ALTER TABLE `cache_messages` ADD INDEX `expires_index` (`expires`);