Migrate database and models for study-group-based authorization

db/migrate/20220906142603_remove_role_from_users.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class RemoveRoleFromUsers < ActiveRecord::Migration[6.1]
+  def change
+    remove_column :external_users, :role
+    remove_column :internal_users, :role
+  end
+end