Add the datalayer and a migration for books.

lib/decentralised_book_index/books/book.ex

@@ -1,7 +1,13 @@
 defmodule DecentralisedBookIndex.Books.Book do
   use Ash.Resource,
     otp_app: :decentralised_book_index,
-    domain: DecentralisedBookIndex.Books
+    domain: DecentralisedBookIndex.Books,
+    data_layer: AshPostgres.DataLayer
+
+  postgres do
+    table "books"
+    repo DecentralisedBookIndex.Repo
+  end
 
   actions do
     defaults [:read]

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

priv/resource_snapshots/repo/books/20250304195635.json

@@ -0,0 +1,79 @@
+{
+  "attributes": [
+    {
+      "allow_nil?": false,
+      "default": "fragment(\"gen_random_uuid()\")",
+      "generated?": false,
+      "primary_key?": true,
+      "references": null,
+      "size": null,
+      "source": "id",
+      "type": "uuid"
+    },
+    {
+      "allow_nil?": false,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "title",
+      "type": "text"
+    },
+    {
+      "allow_nil?": false,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "isbn",
+      "type": "text"
+    },
+    {
+      "allow_nil?": false,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "description",
+      "type": "text"
+    },
+    {
+      "allow_nil?": false,
+      "default": "fragment(\"(now() AT TIME ZONE 'utc')\")",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "inserted_at",
+      "type": "utc_datetime_usec"
+    },
+    {
+      "allow_nil?": false,
+      "default": "fragment(\"(now() AT TIME ZONE 'utc')\")",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "updated_at",
+      "type": "utc_datetime_usec"
+    }
+  ],
+  "base_filter": null,
+  "check_constraints": [],
+  "custom_indexes": [],
+  "custom_statements": [],
+  "has_create_action": false,
+  "hash": "C02C3C11E1ADB515594C9586C00852F7EC02649555AC07F9FCAFA27C403F0450",
+  "identities": [],
+  "multitenancy": {
+    "attribute": null,
+    "global": null,
+    "strategy": null
+  },
+  "repo": "Elixir.DecentralisedBookIndex.Repo",
+  "schema": null,
+  "table": "books"
+}