Migration to drop url_options

db/migrate/20160418142809_drop_url_options_from_visualizations.rb

@@ -0,0 +1,8 @@
+Sequel.migration do
+  up do
+    drop_column :visualizations, :url_options
+  end
+  down do
+    add_column :visualizations, :url_options, :text
+  end
+end