Behaviour for an ArcadeDB migration — a versioned pair of forward/backward steps. Migrations are tenant-blind schema changes; author raw DDL/DML via Arcadic.command/4 in up/1 and down/1.

defmodule MyApp.Migrations.V1 do
  @behaviour Arcadic.Migration
  @impl true
  def version, do: 1
  @impl true
  def up(conn), do: Arcadic.command!(conn, "CREATE VERTEX TYPE User", %{}, language: "sql") && :ok
  @impl true
  def down(conn), do: Arcadic.command!(conn, "DROP TYPE User IF EXISTS", %{}, language: "sql") && :ok
end