Add ability to set a default post expiry (#321)

[akkoma] / priv / repo / migrations / 20170330153447_add_index_to_objects.exs

defmodule Pleroma.Repo.Migrations.AddIndexToObjects do
  use Ecto.Migration

  def change do
    create_if_not_exists(index(:objects, [:data], using: :gin))
  end
end