Rebuild asset folder.

backend/tools/Migrate_01/Migrations/RebuildSnapshots.cs

@@ -27,6 +27,7 @@ namespace Migrate_01.Migrations
             await rebuilder.RebuildRulesAsync();
             await rebuilder.RebuildContentAsync();
             await rebuilder.RebuildAssetsAsync();
+            await rebuilder.RebuildAssetFoldersAsync();
         }
     }
 }

backend/tools/Migrate_01/RebuildRunner.cs

@@ -51,6 +51,7 @@ namespace Migrate_01
             if (rebuildOptions.Assets)
             {
                 await rebuilder.RebuildAssetsAsync(ct);
+                await rebuilder.RebuildAssetFoldersAsync(ct);
             }
 
             if (rebuildOptions.Contents)

backend/tools/Migrate_01/RebuilderExtensions.cs

@@ -43,6 +43,11 @@ namespace Migrate_01
             return rebuilder.RebuildAsync<AssetState, AssetGrain>("^asset\\-", ct);
         }
 
+        public static Task RebuildAssetFoldersAsync(this Rebuilder rebuilder, CancellationToken ct = default)
+        {
+            return rebuilder.RebuildAsync<AssetFolderState, AssetFolderGrain>("^assetfolder\\-", ct);
+        }
+
         public static Task RebuildContentAsync(this Rebuilder rebuilder, CancellationToken ct = default)
         {
             return rebuilder.RebuildAsync<ContentState, ContentGrain>("^content\\-", ct);