akkoma/priv/repo/migrations/20170620133028_add_object_activity_index.exs

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

  def change do
    # This was wrong, now a noop
    # create index(:objects, ["(data->'object'->>'id')", "(data->>'type')"], name: :activities_create_objects_index)
  end
end