Add the author alias registry to manage alias relationship.

Add datalayer and migrations.

priv/repo/migrations/20250306194335_create_author_alias_registy_and_update_author_relationships.exs

@@ -0,0 +1,58 @@
+defmodule DecentralisedBookIndex.Repo.Migrations.CreateAuthorAliasRegistyAndUpdateAuthorRelationships 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(:authors) do
+      add :author_alias_registry_id, :uuid
+    end
+
+    create table(:author_alias_registries, primary_key: false) do
+      add :id, :uuid, null: false, default: fragment("gen_random_uuid()"), primary_key: true
+    end
+
+    alter table(:authors) do
+      modify :author_alias_registry_id,
+             references(:author_alias_registries,
+               column: :id,
+               name: "authors_author_alias_registry_id_fkey",
+               type: :uuid,
+               prefix: "public"
+             )
+    end
+
+    alter table(:author_alias_registries) do
+      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
+    alter table(:author_alias_registries) do
+      remove :updated_at
+      remove :inserted_at
+    end
+
+    drop constraint(:authors, "authors_author_alias_registry_id_fkey")
+
+    alter table(:authors) do
+      modify :author_alias_registry_id, :uuid
+    end
+
+    drop table(:author_alias_registries)
+
+    alter table(:authors) do
+      remove :author_alias_registry_id
+    end
+  end
+end