pleroma/priv/repo/migrations/20170427054757_add_user_and_hub.exs

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

  def change do
    alter table(:websub_client_subscriptions) do
      add :hub, :string
      add :user_id, references(:users)
    end
  end
end