mobilizon/priv/repo/migrations/20180109170315_create_users.exs

defmodule Eventos.Repo.Migrations.CreateUsers do
  use Ecto.Migration

  def change do
    create table(:users) do
      add :email, :string, null: false
      add :role, :integer, default: 0, null: false
      add :password_hash, :string, null: false
      add :account_id, references(:accounts, on_delete: :delete_all), null: false

      timestamps()
    end

    create unique_index(:users, [:email])
  end
end