diff --git a/packages/model/CHANGELOG.md b/packages/model/CHANGELOG.md
index 3311e0bb..fed8fde0 100644
--- a/packages/model/CHANGELOG.md
+++ b/packages/model/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Change Log
 
+## 7.1.0
+
+* Return -1 instead of throwing exception when id is null
+* Added `idAsString` to return id or "" if null
+* Added `AuditableModel`
+
 ## 7.0.0
 
 * Require Dart >= 2.17
diff --git a/packages/model/README.md b/packages/model/README.md
index 1e9b1a61..53e76f48 100644
--- a/packages/model/README.md
+++ b/packages/model/README.md
@@ -1,14 +1,19 @@
-# Angel3 Basic Data Model
+# Angel3 Data Model
 
 ![Pub Version (including pre-releases)](https://img.shields.io/pub/v/angel3_model?include_prereleases)
 [![Null Safety](https://img.shields.io/badge/null-safety-brightgreen)](https://dart.dev/null-safety)
 [![Gitter](https://img.shields.io/gitter/room/angel_dart/discussion)](https://gitter.im/angel_dart/discussion)
 [![License](https://img.shields.io/github/license/dukefirehawk/angel)](https://github.com/dukefirehawk/angel/tree/master/packages/model/LICENSE)
 
-Angel3 basic data model class, no longer with the added weight of the whole framework.
+The basic data models for Angel3 framework.
 
 ```dart
 import 'package:angel3_model/angel3_model.dart';
 ```
 
-This package was created to prevent dependency collisions with third-party packages.
+The available data models are:
+
+* `Model` class
+  * A basic data model
+* `AuditableModel` class
+  * A basic data model with audit log feature
diff --git a/packages/model/lib/angel3_model.dart b/packages/model/lib/angel3_model.dart
index 7c64fd0c..0ee8fabf 100644
--- a/packages/model/lib/angel3_model.dart
+++ b/packages/model/lib/angel3_model.dart
@@ -1,6 +1,4 @@
-//library angel3_model;
-
-/// Represents arbitrary data, with an associated ID and timestamps.
+/// Represents a generic data model with an ID and timestamps.
 class Model {
   /// A unique identifier corresponding to this item.
   String? id;
@@ -14,5 +12,24 @@ class Model {
   Model({this.id, this.createdAt, this.updatedAt});
 
   /// Returns the [id], parsed as an [int].
-  int get idAsInt => id != null ? int.tryParse(id!) ?? -1 : -1;
+  int get idAsInt => id != null ? int.tryParse(id ?? "-1") ?? -1 : -1;
+
+  /// Returns the [id] or "" if null.
+  String get idAsString => id ?? "";
+}
+
+/// Represents a generic data model with audit log feature.
+class AuditableModel extends Model {
+  /// The authorized user who created the record.
+  String? createdBy;
+
+  /// The user who updated the record last time.
+  String? updatedBy;
+
+  AuditableModel(
+      {super.id,
+      super.createdAt,
+      this.createdBy,
+      super.updatedAt,
+      this.updatedBy});
 }
diff --git a/packages/model/pubspec.yaml b/packages/model/pubspec.yaml
index 7dd00448..b7621aca 100644
--- a/packages/model/pubspec.yaml
+++ b/packages/model/pubspec.yaml
@@ -1,5 +1,5 @@
 name: angel3_model
-version: 7.0.0
+version: 7.1.0
 description: Angel3 basic data model class, no longer with the added weight of the whole framework.
 homepage: https://angel3-framework.web.app/
 repository: https://github.com/dukefirehawk/angel/tree/master/packages/model