Add the datalayer and a migration for books.

priv/repo/migrations/20250304195635_create_books.exs

@@ -0,0 +1,30 @@
+defmodule DecentralisedBookIndex.Repo.Migrations.CreateBooks 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
+    create table(:books, primary_key: false) do
+      add :id, :uuid, null: false, default: fragment("gen_random_uuid()"), primary_key: true
+      add :title, :text, null: false
+      add :isbn, :text, null: false
+      add :description, :text, null: false
+
+      add :inserted_at, :utc_datetime_usec,
+        null: false,
+        default: fragment("(now() AT TIME ZONE 'utc')")
+
+      add :updated_at, :utc_datetime_usec,
+        null: false,
+        default: fragment("(now() AT TIME ZONE 'utc')")
+    end
+  end
+
+  def down do
+    drop table(:books)
+  end
+end