Add migrations to require Book's Publisher and AuthorRole's Author.

priv/repo/migrations/20250507154238_update_to_require_author_for_author_role_and_publisher_for_book.exs

@@ -0,0 +1,29 @@
+defmodule DecentralisedBookIndex.Repo.Migrations.UpdateToRequireAuthorForAuthorRoleAndPublisherForBook do
+  @moduledoc """
+  Updates resources based on their most recent snapshots.
+
+  This file was autogenerated with `mix ash_postgres.generate_migrations`
+  """
+
+  use Ecto.Migration
+
+  def up do
+    alter table(:books) do
+      modify :publisher_id, :uuid, null: false
+    end
+
+    alter table(:author_role) do
+      modify :author_id, :uuid, null: false
+    end
+  end
+
+  def down do
+    alter table(:author_role) do
+      modify :author_id, :uuid, null: true
+    end
+
+    alter table(:books) do
+      modify :publisher_id, :uuid, null: true
+    end
+  end
+end