refactor: date column really can't be varchar

sql_updates.txt

@@ -1,6 +1,7 @@
 -- 17.11.2017 -> query optimizations
 ALTER TABLE `s1_prisoners` DROP INDEX `from`, ADD INDEX `from-t11` (`from`, `t11`);
 ALTER TABLE `s1_enforcement` DROP INDEX `from`, ADD INDEX `from` (`from`, `hero`) USING BTREE;
+ALTER TABLE `s1_forum_post` CHANGE `date` `date` INT NULL DEFAULT NULL;
 
 
 -- 8.11.2017 -> query optimizations and cleanups

var/db/struct.sql

@@ -769,7 +769,7 @@ CREATE TABLE IF NOT EXISTS `%PREFIX%forum_post` (
   `post` longtext,
   `topic` int(11) NOT NULL,
   `owner` int(11) NOT NULL,
-  `date` varchar(255) DEFAULT NULL,
+  `date` int(11) DEFAULT NULL,
   `alliance0` int(11) DEFAULT NULL,
   `player0` int(11) DEFAULT NULL,
   `coor0` int(11) DEFAULT NULL,