CDN-fronted servers grouped per CDN, and servers through time

A post whose server is behind a CDN has no place of its own: the globe
groups such posts per CDN in labels on a ring above the Arctic, and
hovering one draws its arc to the CDN's group and a ring where the
server was before the CDN. The card's CDN chip names the CDN, its
domain, how PrivaPub found it (published ranges, response headers or
network), the place before the CDN and the CDN's servers week by week
(/api/privapub/v1/cdns/:domain); the author's tooltip lists the server's
changes of place and CDN week by week (/instances/:host/history). Both
are read on the first hover and kept for the session.

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

Components/Feed/GlobePanel.razor

@@ -75,7 +75,7 @@
 
 		var located = Posts.Where(p => p.Location is not null).ToList();
 		var self = InstanceService.Known(InstanceService.SelfHost);
-		var fingerprint = string.Join('|', located.Select(p => $"{p.Key}:{p.Location.Latitude}:{p.Location.Longitude}")) + $"#{self?.Geo?.Latitude}";
+		var fingerprint = string.Join('|', located.Select(p => $"{p.Key}:{p.Location.Latitude}:{p.Location.Longitude}:{p.Location.CdnKey}")) + $"#{self?.Geo?.Latitude}";
 		if (fingerprint == sentFingerprint)
 			return;
 		sentFingerprint = fingerprint;
@@ -83,8 +83,10 @@
 		var points = located.Select(p =>
 		{
 			var server = InstanceService.Known(p.Host)?.Geo;
-			return new GlobePoint(p.Key, p.Location.Latitude, p.Location.Longitude, p.Location.Source.ToString().ToLowerInvariant(), p.Location.Label, p.Host,
-				server?.Latitude, server?.Longitude, p.Located ? p.RangeKm : null);
+			var before = p.Location.Before;
+			return new GlobePoint(p.Key, p.Location.HasPoint ? p.Location.Latitude : null, p.Location.HasPoint ? p.Location.Longitude : null,
+				p.Location.Source.ToString().ToLowerInvariant(), p.Location.Label, p.Host, server?.Latitude, server?.Longitude, p.Located ? p.RangeKm : null,
+				p.Location.CdnKey, before?.Latitude, before?.Longitude);
 		}).ToList();
 		await module.InvokeVoidAsync("setPosts", points, SelfPoint(self));
 	}
@@ -125,6 +127,7 @@
 		yield return NerdRow.Of(Localizer["centre of view"], stats.CentroidLatitude is { } latitude ? $"{Fixed(latitude)}, {Fixed(stats.CentroidLongitude)}" : null);
 		yield return NerdRow.Of(Localizer["spread"], stats.SpreadKm > 0 ? $"{stats.SpreadKm:N0} km" : null);
 		yield return NerdRow.Of(Localizer["points"], $"{stats.Points} ({stats.Posts} {Localizer["posts"]}, {stats.Servers} {Localizer["servers"]})");
+		yield return NerdRow.Of(Localizer["CDN groups"], stats.CdnGroups > 0 ? stats.CdnGroups : null);
 		yield return NerdRow.Of(Localizer["hovered"], stats.Hovered is { } hovered ? $"{hovered} ({stats.Arcs} {Localizer["arcs"]}, {stats.Rings} {Localizer["rings"]})" : null);
 		yield return NerdRow.Of("fps", stats.Paused ? Localizer["paused"] : stats.Fps.ToString());
 		yield return NerdRow.Of(Localizer["auto-rotate"], stats.AutoRotate);
@@ -154,7 +157,8 @@
 		await base.DisposeAsync();
 	}
 
-	sealed record GlobePoint(string Key, double Lat, double Lng, string Src, string Label, string Host, double? ServerLat, double? ServerLng, double? Range);
+	sealed record GlobePoint(string Key, double? Lat, double? Lng, string Src, string Label, string Host, double? ServerLat, double? ServerLng, double? Range,
+		string Cdn, double? BeforeLat, double? BeforeLng);
 
 	sealed record GlobeSelf(double Lat, double Lng, string Label, string Host);
 
@@ -171,6 +175,7 @@
 		public int Points { get; set; }
 		public int Posts { get; set; }
 		public int Servers { get; set; }
+		public int CdnGroups { get; set; }
 		public int Fps { get; set; }
 		public string Renderer { get; set; }
 		public string Texture { get; set; }