     |> Enum.map(fn
       {team, tie_breaker} ->
         team
-        |> Team.changeset(%{
+        |> Changeset.change(
           prize_preference_hmac_secret: Crypto.random_hmac(),
           tie_breaker: tie_breaker
-        })
+        )
         |> Repo.update!
     end)
 

  import Ecto.Query

  alias Api.{Crypto, Repo, User, Team, Category}

  defp fk(table, on_delete \\ :nilify_all, type \\ :uuid) do
    references(table, on_delete: on_delete, type: type)


    alter table(:teams) do
      add :disqualified_at, :utc_datetime, default: nil
      add :disqualified_by_id, fk(:users), default: nil
      add :eligible, :boolean, default: false
      add :prize_preference_hmac_secret, :string
      add :tie_breaker, :integer
