diff --git a/csharp/App/Backend/Controllers/Controller.cs b/csharp/App/Backend/Controllers/Controller.cs
index 1aac55752..9136ac151 100644
--- a/csharp/App/Backend/Controllers/Controller.cs
+++ b/csharp/App/Backend/Controllers/Controller.cs
@@ -1,14 +1,14 @@
 using System.Net;
 using System.Text;
-using Innovenergy.Backend.Database;
-using Innovenergy.Backend.Model;
-using Innovenergy.Backend.Model.Relations;
-using Innovenergy.Backend.Utils;
+using InnovEnergy.App.Backend.Database;
+using InnovEnergy.App.Backend.Model;
+using InnovEnergy.App.Backend.Model.Relations;
+using InnovEnergy.App.Backend.Utils;
 using InnovEnergy.Lib.Utils;
 using Microsoft.AspNetCore.Mvc;
 using HttpContextAccessor = Microsoft.AspNetCore.Http.HttpContextAccessor;
 
-namespace Innovenergy.Backend.Controllers;
+namespace InnovEnergy.App.Backend.Controllers;
 
 [ApiController]
 [Route("api/")]
@@ -174,8 +174,7 @@ public class Controller
         using var db = Db.Connect();
 
         var folders = db
-                     .GetDirectlyAccessibleFolders(caller) 
-                     .Do(f => f.ParentId = 0) // ReSharper disable once AccessToDisposedClosure
+                     .GetDirectlyAccessibleFolders(caller)  // ReSharper disable once AccessToDisposedClosure
                      .Select(f => PopulateChildren(db, f));
         
         var installations = db.GetDirectlyAccessibleInstallations(caller);
@@ -185,6 +184,25 @@ public class Controller
               .ToList(); // important!
     }
 
+    [Returns<TreeNode[]>]  // assuming swagger knows about arrays but not lists (JSON)
+    [Returns(HttpStatusCode.Unauthorized)]
+    [HttpGet($"{nameof(GetAllFoldersAndInstallations)}/")]
+    public Object GetAllFoldersAndInstallations()
+    {
+        var caller = GetCaller();
+        if (caller == null)
+            return new HttpResponseMessage(HttpStatusCode.Unauthorized);
+
+        using var db = Db.Connect();
+
+        var folders       = db.GetAllAccessibleFolders(caller) as IEnumerable<TreeNode>;
+        var installations = db.GetAllAccessibleInstallations(caller);
+        
+        return folders
+              .Concat(installations)
+              .ToList();  // important!
+    }
+    
     private static Folder PopulateChildren(Db db, Folder folder, HashSet<Int64>? hs = null)
     {
         // TODO: remove cycle detector
diff --git a/csharp/App/Backend/Controllers/Credentials.cs b/csharp/App/Backend/Controllers/Credentials.cs
index 2c5c72b45..f3149f7e8 100644
--- a/csharp/App/Backend/Controllers/Credentials.cs
+++ b/csharp/App/Backend/Controllers/Credentials.cs
@@ -1,6 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 
-namespace Innovenergy.Backend.Controllers;
+namespace InnovEnergy.App.Backend.Controllers;
 
 [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
 public record Credentials(String Username, String Password);
\ No newline at end of file
diff --git a/csharp/App/Backend/Controllers/ReturnsAttribute.cs b/csharp/App/Backend/Controllers/ReturnsAttribute.cs
index 6d94088f5..2ef924055 100644
--- a/csharp/App/Backend/Controllers/ReturnsAttribute.cs
+++ b/csharp/App/Backend/Controllers/ReturnsAttribute.cs
@@ -1,7 +1,7 @@
 using System.Net;
 using Microsoft.AspNetCore.Mvc;
 
-namespace Innovenergy.Backend.Controllers;
+namespace InnovEnergy.App.Backend.Controllers;
 
 public class ReturnsAttribute : ProducesResponseTypeAttribute
 {
diff --git a/csharp/App/Backend/Database/Db.cs b/csharp/App/Backend/Database/Db.cs
index aaabfbfd9..1625c128f 100644
--- a/csharp/App/Backend/Database/Db.cs
+++ b/csharp/App/Backend/Database/Db.cs
@@ -1,11 +1,11 @@
 using System.Diagnostics.CodeAnalysis;
-using Innovenergy.Backend.Model;
-using Innovenergy.Backend.Model.Relations;
-using Innovenergy.Backend.Utils;
+using InnovEnergy.App.Backend.Model;
+using InnovEnergy.App.Backend.Model.Relations;
+using InnovEnergy.App.Backend.Utils;
 using InnovEnergy.Lib.Utils;
 using SQLite;
 
-namespace Innovenergy.Backend.Database;
+namespace InnovEnergy.App.Backend.Database;
 
 public partial class Db : IDisposable
 {
@@ -97,8 +97,6 @@ public partial class Db : IDisposable
         return direct.Concat(fromFolders);
     }
     
-
-    
   
     public IEnumerable<Folder> GetAllAccessibleFolders(User user)
     {
@@ -113,7 +111,8 @@ public partial class Db : IDisposable
               .Where(r => r.UserId == user.Id)
               .Select(r => r.InstallationId)
               .Select(GetInstallationById)
-              .NotNull();
+              .NotNull()
+              .Do(i => i.ParentId = 0);  // hide inaccessible parents from calling user
     }
     
     public IEnumerable<Folder> GetDirectlyAccessibleFolders(User user)
@@ -122,7 +121,8 @@ public partial class Db : IDisposable
               .Where(r => r.UserId == user.Id)
               .Select(r => r.FolderId)
               .Select(GetFolderById)
-              .NotNull();
+              .NotNull()
+              .Do(i => i.ParentId = 0);  // hide inaccessible parents from calling user;
     }
     
     public Result AddToAccessibleInstallations(Int64 userId, Int64 updatedInstallationId)
diff --git a/csharp/App/Backend/Database/Fake.cs b/csharp/App/Backend/Database/Fake.cs
index 427c78434..63fff39ee 100644
--- a/csharp/App/Backend/Database/Fake.cs
+++ b/csharp/App/Backend/Database/Fake.cs
@@ -1,6 +1,6 @@
-using Innovenergy.Backend.Model.Relations;
+using InnovEnergy.App.Backend.Model.Relations;
 
-namespace Innovenergy.Backend.Database;
+namespace InnovEnergy.App.Backend.Database;
 
 public partial class Db
 {
diff --git a/csharp/App/Backend/Database/Folder.cs b/csharp/App/Backend/Database/Folder.cs
index 34e20f529..8a4785639 100644
--- a/csharp/App/Backend/Database/Folder.cs
+++ b/csharp/App/Backend/Database/Folder.cs
@@ -1,9 +1,9 @@
-using Innovenergy.Backend.Model;
-using Innovenergy.Backend.Utils;
+using InnovEnergy.App.Backend.Model;
+using InnovEnergy.App.Backend.Utils;
 using InnovEnergy.Lib.Utils;
 using SQLite;
 
-namespace Innovenergy.Backend.Database;
+namespace InnovEnergy.App.Backend.Database;
 
 public partial class Db
 {
diff --git a/csharp/App/Backend/Database/Installation.cs b/csharp/App/Backend/Database/Installation.cs
index a362a39df..6e554f483 100644
--- a/csharp/App/Backend/Database/Installation.cs
+++ b/csharp/App/Backend/Database/Installation.cs
@@ -1,8 +1,8 @@
-using Innovenergy.Backend.Model;
-using Innovenergy.Backend.Utils;
+using InnovEnergy.App.Backend.Model;
+using InnovEnergy.App.Backend.Utils;
 using SQLite;
 
-namespace Innovenergy.Backend.Database;
+namespace InnovEnergy.App.Backend.Database;
 
 public partial class Db
 {
diff --git a/csharp/App/Backend/Database/User.cs b/csharp/App/Backend/Database/User.cs
index ea2344aaf..0719ab9fe 100644
--- a/csharp/App/Backend/Database/User.cs
+++ b/csharp/App/Backend/Database/User.cs
@@ -2,18 +2,17 @@ using System.Diagnostics.CodeAnalysis;
 using System.Net.Mail;
 using System.Security.Cryptography;
 using System.Text;
-using System.Text.Json;
 using System.Text.Json.Nodes;
 using Flurl.Http;
-using Innovenergy.Backend.Model;
-using Innovenergy.Backend.Utils;
+using InnovEnergy.App.Backend.Model;
+using InnovEnergy.App.Backend.Utils;
 using InnovEnergy.Lib.Utils;
 using SQLite;
 
 #pragma warning disable CS0472
 #pragma warning disable CS8602
 
-namespace Innovenergy.Backend.Database;
+namespace InnovEnergy.App.Backend.Database;
 
 public partial class Db
 {
diff --git a/csharp/App/Backend/Database/User2Folder.cs b/csharp/App/Backend/Database/User2Folder.cs
index 465eea722..29351f1dd 100644
--- a/csharp/App/Backend/Database/User2Folder.cs
+++ b/csharp/App/Backend/Database/User2Folder.cs
@@ -1,7 +1,7 @@
-using Innovenergy.Backend.Model.Relations;
+using InnovEnergy.App.Backend.Model.Relations;
 using SQLite;
 
-namespace Innovenergy.Backend.Database;
+namespace InnovEnergy.App.Backend.Database;
 
 public partial class Db
 {
diff --git a/csharp/App/Backend/Database/User2Installation.cs b/csharp/App/Backend/Database/User2Installation.cs
index ca329deee..069588d7c 100644
--- a/csharp/App/Backend/Database/User2Installation.cs
+++ b/csharp/App/Backend/Database/User2Installation.cs
@@ -1,7 +1,7 @@
-using Innovenergy.Backend.Model.Relations;
+using InnovEnergy.App.Backend.Model.Relations;
 using SQLite;
 
-namespace Innovenergy.Backend.Database;
+namespace InnovEnergy.App.Backend.Database;
 
 public partial class Db
 {
diff --git a/csharp/App/Backend/HeaderFilter.cs b/csharp/App/Backend/HeaderFilter.cs
index 8ca9cdff8..f3520b75e 100644
--- a/csharp/App/Backend/HeaderFilter.cs
+++ b/csharp/App/Backend/HeaderFilter.cs
@@ -1,7 +1,7 @@
 using Microsoft.OpenApi.Models;
 using Swashbuckle.AspNetCore.SwaggerGen;
 
-namespace Innovenergy.Backend;
+namespace InnovEnergy.App.Backend;
 
 /// <summary>
 /// This is for convenient testing! Todo throw me out?
diff --git a/csharp/App/Backend/Model/Folder.cs b/csharp/App/Backend/Model/Folder.cs
index c9c39c594..041c0f479 100644
--- a/csharp/App/Backend/Model/Folder.cs
+++ b/csharp/App/Backend/Model/Folder.cs
@@ -1,4 +1,4 @@
-namespace Innovenergy.Backend.Model;
+namespace InnovEnergy.App.Backend.Model;
 
 public class Folder : TreeNode
 {
diff --git a/csharp/App/Backend/Model/Installation.cs b/csharp/App/Backend/Model/Installation.cs
index 4cca94295..b9858e9c8 100644
--- a/csharp/App/Backend/Model/Installation.cs
+++ b/csharp/App/Backend/Model/Installation.cs
@@ -1,4 +1,4 @@
-namespace Innovenergy.Backend.Model;
+namespace InnovEnergy.App.Backend.Model;
 
 
 public class Installation : TreeNode
diff --git a/csharp/App/Backend/Model/Relations/Relation.cs b/csharp/App/Backend/Model/Relations/Relation.cs
index 31250df14..a791a4609 100644
--- a/csharp/App/Backend/Model/Relations/Relation.cs
+++ b/csharp/App/Backend/Model/Relations/Relation.cs
@@ -1,7 +1,7 @@
 using System.Diagnostics.CodeAnalysis;
 using SQLite;
 
-namespace Innovenergy.Backend.Model.Relations;
+namespace InnovEnergy.App.Backend.Model.Relations;
 
 public abstract class Relation<L,R>
 {
diff --git a/csharp/App/Backend/Model/Relations/Session.cs b/csharp/App/Backend/Model/Relations/Session.cs
index ff64b6644..829cc9a60 100644
--- a/csharp/App/Backend/Model/Relations/Session.cs
+++ b/csharp/App/Backend/Model/Relations/Session.cs
@@ -1,6 +1,6 @@
 using SQLite;
 
-namespace Innovenergy.Backend.Model.Relations;
+namespace InnovEnergy.App.Backend.Model.Relations;
 
 public class Session : Relation<String, Int64>
 {
diff --git a/csharp/App/Backend/Model/Relations/User2Folder.cs b/csharp/App/Backend/Model/Relations/User2Folder.cs
index 6e9f56433..f93cab568 100644
--- a/csharp/App/Backend/Model/Relations/User2Folder.cs
+++ b/csharp/App/Backend/Model/Relations/User2Folder.cs
@@ -1,6 +1,6 @@
 using SQLite;
 
-namespace Innovenergy.Backend.Model.Relations;
+namespace InnovEnergy.App.Backend.Model.Relations;
 
 internal class User2Folder : Relation<Int64, Int64>
 {
diff --git a/csharp/App/Backend/Model/Relations/User2Installation.cs b/csharp/App/Backend/Model/Relations/User2Installation.cs
index 43fa45d0e..fcd2760dd 100644
--- a/csharp/App/Backend/Model/Relations/User2Installation.cs
+++ b/csharp/App/Backend/Model/Relations/User2Installation.cs
@@ -1,6 +1,6 @@
 using SQLite;
 
-namespace Innovenergy.Backend.Model.Relations;
+namespace InnovEnergy.App.Backend.Model.Relations;
 
 internal class User2Installation : Relation<Int64, Int64>
 {
diff --git a/csharp/App/Backend/Model/TreeNode.Equality.cs b/csharp/App/Backend/Model/TreeNode.Equality.cs
index b044a020f..f37cd51d7 100644
--- a/csharp/App/Backend/Model/TreeNode.Equality.cs
+++ b/csharp/App/Backend/Model/TreeNode.Equality.cs
@@ -1,12 +1,13 @@
 using System.Diagnostics.CodeAnalysis;
 
-namespace Innovenergy.Backend.Model;
+namespace InnovEnergy.App.Backend.Model;
 
 public abstract partial class TreeNode
 {
+    // Note: Only consider Id, but not ParentId for TreeNode equality checks
     protected Boolean Equals(TreeNode other)
     {
-        return Id == other.Id && ParentId == other.ParentId;
+        return Id == other.Id;
     }
 
     public override Boolean Equals(Object? obj)
@@ -17,8 +18,5 @@ public abstract partial class TreeNode
     }
 
     [SuppressMessage("ReSharper", "NonReadonlyMemberInGetHashCode")]
-    public override Int32 GetHashCode()
-    {
-        return HashCode.Combine(Id, ParentId);
-    }
+    public override Int32 GetHashCode() => Id.GetHashCode();
 }
\ No newline at end of file
diff --git a/csharp/App/Backend/Model/TreeNode.cs b/csharp/App/Backend/Model/TreeNode.cs
index b3cf22170..d02890a62 100644
--- a/csharp/App/Backend/Model/TreeNode.cs
+++ b/csharp/App/Backend/Model/TreeNode.cs
@@ -1,6 +1,6 @@
 using SQLite;
 
-namespace Innovenergy.Backend.Model;
+namespace InnovEnergy.App.Backend.Model;
 
 public abstract partial class TreeNode
 {
diff --git a/csharp/App/Backend/Model/User.cs b/csharp/App/Backend/Model/User.cs
index a1a0be392..762c819a4 100644
--- a/csharp/App/Backend/Model/User.cs
+++ b/csharp/App/Backend/Model/User.cs
@@ -1,6 +1,6 @@
 using SQLite;
 
-namespace Innovenergy.Backend.Model;
+namespace InnovEnergy.App.Backend.Model;
 
 public class User : TreeNode
 {
diff --git a/csharp/App/Backend/Program.cs b/csharp/App/Backend/Program.cs
index fd0206737..ae662b779 100644
--- a/csharp/App/Backend/Program.cs
+++ b/csharp/App/Backend/Program.cs
@@ -1,7 +1,7 @@
-using Innovenergy.Backend.Database;
+using InnovEnergy.App.Backend.Database;
 using Microsoft.OpenApi.Models;
 
-namespace Innovenergy.Backend;
+namespace InnovEnergy.App.Backend;
 
 public static class Program
 {
diff --git a/csharp/App/Backend/Utils/Crypto.cs b/csharp/App/Backend/Utils/Crypto.cs
index 199b17fb9..c176fd284 100644
--- a/csharp/App/Backend/Utils/Crypto.cs
+++ b/csharp/App/Backend/Utils/Crypto.cs
@@ -1,6 +1,6 @@
 using System.Security.Cryptography;
 
-namespace Innovenergy.Backend.Utils;
+namespace InnovEnergy.App.Backend.Utils;
 
 public static class Crypto
 {
diff --git a/csharp/App/Backend/Utils/Result.cs b/csharp/App/Backend/Utils/Result.cs
index 21e85876c..979e9184e 100644
--- a/csharp/App/Backend/Utils/Result.cs
+++ b/csharp/App/Backend/Utils/Result.cs
@@ -1,4 +1,4 @@
-namespace Innovenergy.Backend.Utils;
+namespace InnovEnergy.App.Backend.Utils;
 
 public class Result
 {