Index: db/migrate/20150725020314_change_attachments_file_size_limit.rb
===================================================================
--- db/migrate/20150725020314_change_attachments_file_size_limit.rb	(revision 0)
+++ db/migrate/20150725020314_change_attachments_file_size_limit.rb	(working copy)
@@ -0,0 +1,9 @@
+class ChangeAttachmentsFileSizeLimit < ActiveRecord::Migration
+  def up 
+    change_column :attachments, :filesize, :integer, :limit => 8
+  end
+
+  def down
+    change_column :attachments, :filesize, :integer, :limit => 4
+  end
+end