chore: init commit

in worker.../repo/GITFOLDER.zip is the .git folder.

worker-toolkit-stocks-in-the-future/repo/app/models/grade.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class Grade < ApplicationRecord
+  has_many :classroom_grades, dependent: :restrict_with_error
+  has_many :classrooms, through: :classroom_grades
+
+  validates :name, presence: true, uniqueness: { case_sensitive: false }
+  validates :level, presence: true, uniqueness: true
+end