Refactored the whole code to a better structure

project/migrations/2020-04-04-120638_create_users/up.sql

@@ -0,0 +1,8 @@
+CREATE TABLE users (
+	`id` int NOT NULL AUTO_INCREMENT,
+	`username` varchar(100) UNIQUE NOT NULL,
+	`password` varchar(128) NOT NULL,
+	`admin` boolean NOT NULL,
+	`created_at` timestamp NOT NULL,
+	PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;