Show parent response rate

db/migrate/20241031190531_create_parents.rb

@@ -0,0 +1,10 @@
+class CreateParents < ActiveRecord::Migration[7.1]
+  def change
+    create_table :parents do |t|
+      t.string :response_id
+      t.integer :number_of_children
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20241031205926_add_parent_to_survey_item_response.rb

@@ -0,0 +1,5 @@
+class AddParentToSurveyItemResponse < ActiveRecord::Migration[7.1]
+  def change
+    add_reference :survey_item_responses, :parent, foreign_key: true
+  end
+end