add optional shared link to templates

db/migrate/20250523121121_add_shared_link_to_templates.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class AddSharedLinkToTemplates < ActiveRecord::Migration[8.0]
+  disable_ddl_transaction
+
+  class MigrationTemplate < ActiveRecord::Base
+    self.table_name = 'templates'
+  end
+
+  def up
+    add_column :templates, :shared_link, :boolean, if_not_exists: true
+
+    MigrationTemplate.where(shared_link: nil).in_batches.update_all(shared_link: true)
+
+    change_column_default :templates, :shared_link, from: nil, to: false
+    change_column_null :templates, :shared_link, false
+  end
+
+  def down
+    remove_column :templates, :shared_link
+  end
+end