programming-phoenix-liveview/pento/priv/repo/migrations/20240818133031_add_username.exs

defmodule Pento.Repo.Migrations.AddUsername do
  use Ecto.Migration

  def change do
    alter table("users") do
      add :username, :string, null: false
    end

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