Personas have walls their followers write on

Owner decision of 2026-10-06 (G-0009, FEP-400e). A persona's actor names its wall (…/graffiti, sm:wall) and, in
Smithereen's privacySettings, that its followers may write on it. A public post that is not a reply, sent with the wall
as its target by an account following the persona, is hosted: the persona is notified, it reaches the persona's and its
followers' homes, and the followers' servers and the author's are told with Add{Note}. The persona deletes it with
DELETE /api/v1/statuses/:id, which sends Remove{Note}; Smithereen deletes the post then. The wall lists the persona's
public posts that start a thread and what was written on it.

Elsewhere: an account's Add{Note} on its own wall shows the post to its followers here as on that wall (privapub.wall on
the status), and its Remove takes it away. An Add or Remove naming a collection of the account's own server PrivaPub
does not know has its document read again first, at most hourly: accounts kept before walls were read had none.

Checked live: Smithereen 40 checks (G-0009 closed); GoToSocial and Mastodon unchanged (121).

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

PrivaPub/Federation/Controllers/PeasantsController.cs

@@ -143,6 +143,30 @@ namespace PrivaPub.Federation.Controllers
 			return Activity(ActivityPubRenderer.OrderedCollection(local.Followers, (int)count, default));
 		}
 
+		// a persona's wall (FEP-400e): its own public posts that start a thread, and what its followers wrote on it, newest
+		// first, as links; Smithereen reads it when one of its accounts starts following the persona
+		[HttpGet, Route("{actor}/" + Walls.Path)]
+		public async Task<IActionResult> Wall(string actor, [FromQuery] bool page, [FromQuery(Name = "max_id")] string maxId, CancellationToken token)
+		{
+			var local = await _localActors.FindByUserName(actor, token);
+			if (local is not { HasWall: true })
+				return NotFound();
+			var wall = local.Wall;
+			System.Linq.Expressions.Expression<Func<PostEntity, bool>> onWall = p => !p.DeletedAt.HasValue && !p.AuthorGone && !p.IsLocalOnly
+				&& (p.Visibility == PostVisibility.Public || p.Visibility == PostVisibility.Unlisted)
+				&& (p.WallURI == wall
+					|| p.GroupUserId == local.Id && !p.IsFederatedCopy && p.ReblogOfPostId == null && p.AnsweringToPostId == null && p.InReplyToURI == null && p.GroupId == null);
+			if (!page)
+				return Activity(ActivityPubRenderer.OrderedCollection(wall, (int)await DB.Default.CountAsync(onWall, token), default, $"{wall}?page=true"));
+			var query = _dbEntities.Posts.Match(onWall);
+			if (!string.IsNullOrEmpty(maxId))
+				query.Match(f => f.Lt(p => p.ID, maxId));
+			var latest = await query.Sort(p => p.ID, Order.Descending).Limit(OutboxSize).ExecuteAsync(token);
+			var pageId = string.IsNullOrEmpty(maxId) ? $"{wall}?page=true" : $"{wall}?page=true&max_id={maxId}";
+			var next = latest.Count == OutboxSize ? $"{wall}?page=true&max_id={latest[^1].ID}" : default;
+			return Activity(ActivityPubRenderer.OrderedCollectionPage(pageId, wall, latest.Select(p => (JsonNode)(p.ObjectURI ?? local.PostUri(p.ID))), next, default));
+		}
+
 		// FEP-8fcf: the persona's followers on the server that signs the request, and nobody else's (FollowersSynchronization)
 		[HttpGet, Route("{actor}/groupies/roll-call")]
 		public async Task<IActionResult> RollCall(string actor, CancellationToken token)