No more nullable uses field(it was signed) so option was redundant

server/migrations/2020-02-04-083657_invites/up.sql

@@ -2,6 +2,6 @@
 CREATE TABLE IF NOT EXISTS `invites` (
 	`id` bigint UNSIGNED NOT NULL,
 	`expires` bigint UNSIGNED NOT NULL,
-	`uses` integer, 
+	`uses` integer NOT NULL, 
 	PRIMARY KEY( `id` )
 );