diff --git a/lib/decentralised_book_index/metadata/author.ex b/lib/decentralised_book_index/metadata/author.ex
index e1509d5..f73fb77 100644
--- a/lib/decentralised_book_index/metadata/author.ex
+++ b/lib/decentralised_book_index/metadata/author.ex
@@ -115,8 +115,6 @@ defmodule DecentralisedBookIndex.Metadata.Author do
       attribute_writable? true
     end
 
-    belongs_to :author_role, Metadata.AuthorRole do
-      attribute_writable? true
-    end
+    has_many :author_role, Metadata.AuthorRole
   end
 end
diff --git a/lib/decentralised_book_index/metadata/author_role.ex b/lib/decentralised_book_index/metadata/author_role.ex
index 670e7e2..a190c9c 100644
--- a/lib/decentralised_book_index/metadata/author_role.ex
+++ b/lib/decentralised_book_index/metadata/author_role.ex
@@ -42,8 +42,8 @@ defmodule DecentralisedBookIndex.Metadata.AuthorRole do
       allow_nil? true
     end
 
-    has_one :author, Metadata.Author do
-      allow_nil? false
+    belongs_to :author, Metadata.Author do
+      allow_nil? true
     end
   end
 end
diff --git a/priv/repo/migrations/20250311182445_update_author_and_author_role_relationship.exs b/priv/repo/migrations/20250311182445_update_author_and_author_role_relationship.exs
new file mode 100644
index 0000000..12d0c2b
--- /dev/null
+++ b/priv/repo/migrations/20250311182445_update_author_and_author_role_relationship.exs
@@ -0,0 +1,43 @@
+defmodule DecentralisedBookIndex.Repo.Migrations.UpdateAuthorAndAuthorRoleRelationship 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
+      remove :author_role_id
+    end
+
+    alter table(:author_role) do
+      add :author_id,
+          references(:authors,
+            column: :id,
+            name: "author_role_author_id_fkey",
+            type: :uuid,
+            prefix: "public"
+          )
+    end
+  end
+
+  def down do
+    drop constraint(:author_role, "author_role_author_id_fkey")
+
+    alter table(:author_role) do
+      remove :author_id
+    end
+
+    alter table(:authors) do
+      add :author_role_id,
+          references(:author_role,
+            column: :id,
+            name: "authors_author_role_id_fkey",
+            type: :uuid,
+            prefix: "public"
+          )
+    end
+  end
+end
diff --git a/priv/resource_snapshots/repo/author_role/20250311182445.json b/priv/resource_snapshots/repo/author_role/20250311182445.json
new file mode 100644
index 0000000..98c52b8
--- /dev/null
+++ b/priv/resource_snapshots/repo/author_role/20250311182445.json
@@ -0,0 +1,127 @@
+{
+  "attributes": [
+    {
+      "allow_nil?": false,
+      "default": "fragment(\"gen_random_uuid()\")",
+      "generated?": false,
+      "primary_key?": true,
+      "references": null,
+      "size": null,
+      "source": "id",
+      "type": "uuid"
+    },
+    {
+      "allow_nil?": true,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "role",
+      "type": "text"
+    },
+    {
+      "allow_nil?": false,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": null,
+      "size": null,
+      "source": "order",
+      "type": "bigint"
+    },
+    {
+      "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"
+    },
+    {
+      "allow_nil?": true,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": {
+        "deferrable": false,
+        "destination_attribute": "id",
+        "destination_attribute_default": null,
+        "destination_attribute_generated": null,
+        "index?": false,
+        "match_type": null,
+        "match_with": null,
+        "multitenancy": {
+          "attribute": null,
+          "global": null,
+          "strategy": null
+        },
+        "name": "author_role_book_id_fkey",
+        "on_delete": null,
+        "on_update": null,
+        "primary_key?": true,
+        "schema": "public",
+        "table": "books"
+      },
+      "size": null,
+      "source": "book_id",
+      "type": "uuid"
+    },
+    {
+      "allow_nil?": true,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": {
+        "deferrable": false,
+        "destination_attribute": "id",
+        "destination_attribute_default": null,
+        "destination_attribute_generated": null,
+        "index?": false,
+        "match_type": null,
+        "match_with": null,
+        "multitenancy": {
+          "attribute": null,
+          "global": null,
+          "strategy": null
+        },
+        "name": "author_role_author_id_fkey",
+        "on_delete": null,
+        "on_update": null,
+        "primary_key?": true,
+        "schema": "public",
+        "table": "authors"
+      },
+      "size": null,
+      "source": "author_id",
+      "type": "uuid"
+    }
+  ],
+  "base_filter": null,
+  "check_constraints": [],
+  "custom_indexes": [],
+  "custom_statements": [],
+  "has_create_action": true,
+  "hash": "386FF5C297DF741B57842BF4690249CB624EFDE6F8B08B27A6E17071A44C8ABC",
+  "identities": [],
+  "multitenancy": {
+    "attribute": null,
+    "global": null,
+    "strategy": null
+  },
+  "repo": "Elixir.DecentralisedBookIndex.Repo",
+  "schema": null,
+  "table": "author_role"
+}
\ No newline at end of file
diff --git a/priv/resource_snapshots/repo/authors/20250311182445.json b/priv/resource_snapshots/repo/authors/20250311182445.json
new file mode 100644
index 0000000..7ceeb51
--- /dev/null
+++ b/priv/resource_snapshots/repo/authors/20250311182445.json
@@ -0,0 +1,98 @@
+{
+  "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": "name",
+      "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"
+    },
+    {
+      "allow_nil?": true,
+      "default": "nil",
+      "generated?": false,
+      "primary_key?": false,
+      "references": {
+        "deferrable": false,
+        "destination_attribute": "id",
+        "destination_attribute_default": null,
+        "destination_attribute_generated": null,
+        "index?": false,
+        "match_type": null,
+        "match_with": null,
+        "multitenancy": {
+          "attribute": null,
+          "global": null,
+          "strategy": null
+        },
+        "name": "authors_author_alias_registry_id_fkey",
+        "on_delete": null,
+        "on_update": null,
+        "primary_key?": true,
+        "schema": "public",
+        "table": "author_alias_registries"
+      },
+      "size": null,
+      "source": "author_alias_registry_id",
+      "type": "uuid"
+    }
+  ],
+  "base_filter": null,
+  "check_constraints": [],
+  "custom_indexes": [],
+  "custom_statements": [],
+  "has_create_action": true,
+  "hash": "490E9E7EB08795DE4BD8A1B1A01EAF8B0CCD813B9F659BD56658CA9B069C140F",
+  "identities": [],
+  "multitenancy": {
+    "attribute": null,
+    "global": null,
+    "strategy": null
+  },
+  "repo": "Elixir.DecentralisedBookIndex.Repo",
+  "schema": null,
+  "table": "authors"
+}
\ No newline at end of file