Fix race condition on vault import with multiple folders (#1786)

apps/server/AliasVault.Client/Main/Pages/Settings/ImportExport/Components/ImportServiceCard.razor

@@ -804,8 +804,9 @@
                     }
                 }
 
-                // Create new folder with parent relationship
-                var newFolderId = await FolderService.CreateAsync(folderName, parentFolderId);
+                // Create new folder with parent relationship. Skip per-folder background sync —
+                // the final DbService.SaveDatabaseAsync() at the end of the import covers all mutations.
+                var newFolderId = await FolderService.CreateAsync(folderName, parentFolderId, syncToServer: false);
                 folderPathToId[folderPath] = newFolderId;
             }
         }

apps/server/AliasVault.Client/Services/FolderService.cs

@@ -91,8 +91,10 @@ public sealed class FolderService(DbService dbService)
     /// </summary>
     /// <param name="name">The folder name.</param>
     /// <param name="parentFolderId">Optional parent folder ID.</param>
+    /// <param name="syncToServer">Whether to trigger a background sync to the server. Set to false when
+    /// the caller will batch multiple mutations and perform a single sync afterwards (e.g. bulk import).</param>
     /// <returns>The created folder ID.</returns>
-    public async Task<Guid> CreateAsync(string name, Guid? parentFolderId = null)
+    public async Task<Guid> CreateAsync(string name, Guid? parentFolderId = null, bool syncToServer = true)
     {
         var context = await dbService.GetDbContextAsync();
 
@@ -109,7 +111,11 @@ public sealed class FolderService(DbService dbService)
 
         context.Folders.Add(folder);
         await context.SaveChangesAsync();
-        dbService.SaveDatabaseInBackground();
+
+        if (syncToServer)
+        {
+            dbService.SaveDatabaseInBackground();
+        }
 
         return folder.Id;
     }