pleroma/priv/repo/migrations/20180617221540_create_activities_in_reply_to_index.exs

defmodule Pleroma.Repo.Migrations.CreateActivitiesInReplyToIndex do
  use Ecto.Migration
  @disable_ddl_transaction true

  def change do
    create index(:activities, ["(data->'object'->>'inReplyTo')"], concurrently: true, name: :activities_in_reply_to)
  end
end