add a local_only column to the statuses table

db/migrate/20171210213213_add_local_only_flag_to_statuses.rb

@@ -0,0 +1,5 @@
+class AddLocalOnlyFlagToStatuses < ActiveRecord::Migration[5.1]
+  def change
+    add_column :statuses, :local_only, :boolean
+  end
+end