Lists: a persona's followed accounts, read apart

Mastodon's lists replace the empty stubs: CRUD, members (only accounts the
persona follows; a follow that ends takes its memberships with it),
accounts/:id/lists, and timelines/list/:id from the persona's home entries
with the replies policy (followed, list, none; self-replies and replies to
the persona always). An exclusive list's members stay out of home. Lists
never federate, and go with a deleted persona.

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

PrivaPub/Models/Social/Lists.cs

@@ -0,0 +1,32 @@
+using MongoDB.Entities;
+
+namespace PrivaPub.Models.Social
+{
+	//a persona's list of accounts it follows (Mastodon lists): a timeline of their posts, and, when exclusive, their posts
+	//kept out of the home timeline. Lists are the persona's own and never federate.
+	public class PersonaList : Entity
+	{
+		public string AvatarId { get; set; }
+		public string Title { get; set; }
+		public string RepliesPolicy { get; set; } = ListRepliesPolicy.List;
+		public bool Exclusive { get; set; }
+		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+	}
+
+	public class PersonaListMember : Entity
+	{
+		public string ListId { get; set; }
+		public string AvatarId { get; set; }//the list's owner
+		public string AccountId { get; set; }//the member: a ForeignAvatar.ID, an Avatar.ID or a community's Group.ID
+		public DateTime AddedAt { get; set; } = DateTime.UtcNow;
+	}
+
+	public static class ListRepliesPolicy
+	{
+		public const string Followed = "followed";//replies to anyone the persona follows
+		public const string List = "list";//replies to members of the list
+		public const string None = "none";
+
+		public static bool IsValid(string value) => value is Followed or List or None;
+	}
+}