add template access

app/models/template_access.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: template_accesses
+#
+#  id          :bigint           not null, primary key
+#  created_at  :datetime         not null
+#  updated_at  :datetime         not null
+#  template_id :bigint           not null
+#  user_id     :bigint           not null
+#
+# Indexes
+#
+#  index_template_accesses_on_template_id_and_user_id  (template_id,user_id) UNIQUE
+#
+# Foreign Keys
+#
+#  fk_rails_...  (template_id => templates.id)
+#
+class TemplateAccess < ApplicationRecord
+  ADMIN_USER_ID = -1
+
+  belongs_to :template
+  belongs_to :user, optional: true
+end