Notifications in groups, and what is unread

The Notifications tab reads grouped notifications (/api/v2/notifications):
likes and boosts of one post, or follows of one hour, are one card naming
both accounts of a pair, or the newest and how many others, with their
avatars. A notification the stream tells joins its group and waits on top.
The tab's badge counts what is unread; opening the tab moves the
notifications marker to the newest shown, which reads it on PrivaPub.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

Models/Mastodon/Notification.cs

@@ -12,6 +12,45 @@ public class Notification
 	public Account Account { get; set; }
 	public Status Status { get; set; }
 	public string Emoji { get; set; }
+	/// <summary>The group it belongs to (likes and boosts of one post, follows within an hour), or ungrouped-{id}.</summary>
+	public string GroupKey { get; set; }
+}
+
+/// <summary>/api/v2/notifications: notifications folded into groups, with the accounts and posts they name.</summary>
+public class GroupedNotifications
+{
+	public List<Account> Accounts { get; set; } = [];
+	public List<Status> Statuses { get; set; } = [];
+	public List<NotificationGroup> NotificationGroups { get; set; } = [];
+}
+
+public class NotificationGroup
+{
+	public string GroupKey { get; set; }
+	public int NotificationsCount { get; set; }
+	public string Type { get; set; }
+	public string MostRecentNotificationId { get; set; }
+	public string PageMinId { get; set; }
+	public string PageMaxId { get; set; }
+	public DateTime LatestPageNotificationAt { get; set; }
+	public List<string> SampleAccountIds { get; set; } = [];
+	public string StatusId { get; set; }
+	public string Emoji { get; set; }
+}
+
+public class MarkersForm
+{
+	public MarkerForm Notifications { get; set; }
+}
+
+public class MarkerForm
+{
+	public string LastReadId { get; set; }
+}
+
+public class UnreadCount
+{
+	public int Count { get; set; }
 }
 
 /// <summary>A direct conversation: its participants and its last post.</summary>