* [DEV] Fixed DB structure & UI tweaks

inc/sql/dbstructure.sql

@@ -28,6 +28,7 @@ DROP TABLE IF EXISTS `categories`;
 CREATE TABLE `categories` (
   `category_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
   `category_name` varchar(50) NOT NULL,
+  `category_hash` varbinary(40) NOT NULL,
   `category_description` varchar(255) DEFAULT NULL,
   PRIMARY KEY (`category_id`)
 ) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;