ratemyclient/priv/repo/migrations/20251128214700_add_username_to_users.exs

defmodule MyFirstElixirVibeCode.Repo.Migrations.AddUsernameToUsers do
  use Ecto.Migration

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

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