Upgrade to ktorm 3.0.0, remove email field from users

api/resources/db/migration/V1__Create_user_table.sql

@@ -1,13 +1,9 @@
 create table Users
 (
-    id         int auto_increment primary key,
-    username   varchar(50)  not null,
-    email      varchar(255) not null,
-    password   varchar(255) not null,
-    created_at datetime     not null,
-    last_login datetime     null,
+    id       int auto_increment primary key,
+    username varchar(50)  not null,
+    password varchar(255) not null,
 
-    constraint email unique (email),
     constraint username unique (username)
 );