diff --git a/app/lib/admin/models.dart b/app/lib/admin/models.dart
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+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:clock/clock.dart';
+import 'package:pub_dev/shared/utils.dart';
+
+import '../shared/datastore.dart' as db;
+
+/// Tracks the status of the moderation or appeal case.
+@db.Kind(name: 'ModerationCase', idType: db.IdType.String)
+class ModerationCase extends db.ExpandoModel<String> {
+  /// Same as [id].
+  /// A random UUID id.
+  String get caseId => id!;
+
+  /// The `userId` of the reporter (may be null for non-authenticated reporter).
+  @db.StringProperty()
+  String? reporterUserId;
+
+  /// The email of the reporter.
+  @db.StringProperty(required: true)
+  late String reporterEmail;
+
+  /// The case was opened at this time.
+  @db.DateTimeProperty(required: true)
+  late DateTime opened;
+
+  /// The case was resolved at this time (or null if it has not been resolved yet).
+  @db.DateTimeProperty()
+  DateTime? resolved;
+
+  /// The source of the case, one of:
+  /// - `external-notification`,
+  /// - `internal-notification` (only used for reports from @google.com accounts), or,
+  /// - `automated-detection`. (will not be used)
+  @db.StringProperty(required: true)
+  late String detectedBy;
+
+  /// The kind of the case, one of:
+  /// - `notification`, or,
+  /// - `appeal`
+  @db.StringProperty(required: true)
+  late String kind;
+
+  /// The package this notification or appeal concerns.
+  /// In the case of an appeal, reporter must be owner of said package.
+  @db.StringProperty()
+  String? subjectPackage;
+
+  /// The publisher this notification or appeal concerns.
+  /// In the case of an appeal, reporter must be a member of said publisher.
+  @db.StringProperty()
+  String? subjectPublisher;
+
+  /// The `caseId` of the appeal (or null).
+  @db.StringProperty()
+  String? appealedCaseId;
+
+  /// One of:
+  /// - `pending`, if this is an appeal and we haven't decided anything yet.
+  /// - `no-action`, if this is a notification (kind = notification) and
+  ///   we decided to take no action.
+  /// - `moderation-applied`, if this is a notification (kind = notification) and
+  ///   we decided to apply content moderation.
+  /// - `no-action-upheld`, if this is an appeal (kind = appeal) of a notification
+  ///   where we took no-action, and we decided to uphold that decision.
+  /// - `no-action-reverted`, if this is an appeal (kind = appeal) of a notification
+  ///   where we took no-action, and we decided to revert that decision.
+  /// - `moderation-upheld`, if this is an appeal (kind = appeal) of a notification
+  ///   where we applied content moderation, and we decided to uphold that decision.
+  /// - `moderation-reverted`, if this is an appeal (kind = appeal) of a notification
+  ///   where we applied content moderation, and we decided to revert that decision.
+  @db.StringProperty(required: true)
+  String? status;
+
+  ModerationCase();
+
+  ModerationCase.init({
+    required this.reporterUserId,
+    required this.reporterEmail,
+    required this.detectedBy,
+    required this.kind,
+    required this.status,
+  }) {
+    id = createUuid();
+    opened = clock.now().toUtc();
+  }
+}