removed optional fields

server/migrations/2020-02-04-083551_users/up.sql

@@ -5,8 +5,8 @@
 -- email: used for signing in to the server
 CREATE TABLE IF NOT EXISTS `users` (
 	`userid` bigint UNSIGNED NOT NULL auto_increment,
-	`username` varchar(255),
-	`key_hash` varchar(255),
+	`username` varchar(255) NOT NULL,
+	`key` varchar(255) NOT NULL,
 	`date` bigint UNSIGNED NOT NULL, 
 	PRIMARY KEY( `userid` )
 );