created optimized_image model

db/migrate/20130616082327_create_optimized_images.rb

@@ -0,0 +1,17 @@
+class CreateOptimizedImages < ActiveRecord::Migration
+  def up
+    create_table :optimized_images do |t|
+      t.string :sha, null: false
+      t.string :ext, null: false
+      t.integer :width, null: false
+      t.integer :height, null: false
+      t.integer :upload_id, null: false
+    end
+
+    add_index :optimized_images, :upload_id
+  end
+
+  def down
+    drop_table :optimized_images
+  end
+end