mobilizon/priv/repo/migrations/20180110093905_create_tags.exs

defmodule Mobilizon.Repo.Migrations.CreateTags do
  use Ecto.Migration

  def change do
    create table(:tags) do
      add(:title, :string)
      add(:slug, :string, null: false)

      timestamps()
    end

    create(unique_index(:tags, [:slug]))
  end
end