feat: started working on #23

sql/models.sql

@@ -21,7 +21,8 @@ create table if not exists models (
 create table if not exists model_classes (
     id uuid primary key default gen_random_uuid(),
     model_id uuid references models (id) on delete cascade,
-    name varchar (70) not null
+    name varchar (70) not null,
+    class_order integer
 );
 
 -- drop table if exists model_data_point;