Add progress bar model

db/migrate/20190103132925_create_progress_bars.rb

@@ -0,0 +1,23 @@
+class CreateProgressBars < ActiveRecord::Migration
+  def change
+    create_table :progress_bars do |t|
+      t.integer :kind
+      t.integer :percentage
+      t.references :progressable, polymorphic: true
+
+      t.timestamps null: false
+    end
+
+    reversible do |change|
+      change.up do
+        ProgressBar.create_translation_table!({
+          title: :string
+        })
+      end
+
+      change.down do
+        ProgressBar.drop_translation_table!
+      end
+    end
+  end
+end