Frontend first draft

frontend/pshared/lib/models/storable.dart

@@ -0,0 +1,30 @@
+import 'package:pshared/config/constants.dart';
+
+
+abstract class Storable {
+  String get id;
+  DateTime get createdAt;
+  DateTime get  updatedAt;
+}
+
+class _StorableImp implements Storable {
+  @override
+  final String id;
+  @override
+  final DateTime createdAt;
+  @override
+  final DateTime updatedAt;
+
+  const _StorableImp({
+    required this.id,
+    required this.createdAt,
+    required this.updatedAt,
+  });
+
+}
+
+Storable newStorable({String? id, DateTime? createdAt, DateTime? updatedAt}) => _StorableImp(
+  id: id ?? Constants.nilObjectRef, 
+  createdAt: createdAt ?? DateTime.now().toUtc(), 
+  updatedAt: updatedAt ?? DateTime.now().toUtc(),
+);