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

[akkoma] / priv / repo / migrations / 20200930082320_user_ur_is_index_part_three.exs

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

  def change do
    drop_if_exists(unique_index(:users, :uri))
    create_if_not_exists(index(:users, :uri))
  end
end