diff --git a/csharp/app/Backend/Controllers/Controller.cs b/csharp/app/Backend/Controllers/Controller.cs
index 10110397e..345ac4e58 100644
--- a/csharp/app/Backend/Controllers/Controller.cs
+++ b/csharp/app/Backend/Controllers/Controller.cs
@@ -160,8 +160,47 @@ public class Controller
               .GetAllAccessibleFolders(caller)
               .ToList();  // important!
     }
-
     
+    [Returns<TreeNode[]>]  // assuming swagger knows about arrays but not lists (JSON)
+    [Returns(HttpStatusCode.Unauthorized)]
+    [HttpGet($"{nameof(GetTree)}/")]
+    public Object GetTree()
+    {
+        var caller = GetCaller();
+        if (caller == null)
+            return new HttpResponseMessage(HttpStatusCode.Unauthorized);
+        
+        using var db = Db.Connect();
+
+        var folders = db
+                     .GetDirectlyAccessibleFolders(caller) // ReSharper disable once AccessToDisposedClosure
+                     .Select(f => PopulateChildren(db, f));
+        
+        var installations = db.GetDirectlyAccessibleInstallations(caller);
+
+        return folders
+              .Concat<TreeNode>(installations)
+              .ToList(); // important!
+    }
+
+    private static Folder PopulateChildren(Db db, Folder folder, HashSet<Int64>? hs = null)
+    {
+        // TODO: remove cycle detector
+        hs ??= new HashSet<Int64>();
+        if (!hs.Add(folder.Id)) 
+            throw new Exception("Cycle detected: folder " + folder.Id);
+
+        var installations = db.GetChildInstallations(folder);
+        var folders = db
+                     .GetChildFolders(folder)
+                     .Select(c => PopulateChildren(db, c, hs));
+        
+        folder.Children = folders.Concat<TreeNode>(installations).ToList();
+     
+        return folder;
+    }
+
+
     [Returns(HttpStatusCode.OK)]
     [Returns(HttpStatusCode.Unauthorized)]
     [HttpPut($"{nameof(UpdateUser)}/")]
@@ -184,7 +223,7 @@ public class Controller
     [Returns(HttpStatusCode.OK)]
     [Returns(HttpStatusCode.Unauthorized)]
     [HttpPut($"{nameof(UpdateInstallation)}/")]
-    public Object UpdateInstallation(Installation updatedInstallation)
+    public Object UpdateInstallation(Installation installation)
     {
         var caller = GetCaller();
         
@@ -195,7 +234,7 @@ public class Controller
         
         var hasAccessToInstallation = db
                                      .GetAllAccessibleInstallations(caller)
-                                     .Any(i => i.Id == updatedInstallation.Id);
+                                     .Any(i => i.Id == installation.Id);
         
         if (!hasAccessToInstallation)
             return new HttpResponseMessage(HttpStatusCode.Unauthorized);
@@ -203,7 +242,7 @@ public class Controller
         // TODO: accessibility by other users etc
         // TODO: sanity check changes
         
-        return db.UpdateInstallation(updatedInstallation);
+        return db.UpdateInstallation(installation);
     }
     
     
diff --git a/csharp/app/Backend/Model/TreeNode.Equality.cs b/csharp/app/Backend/Model/TreeNode.Equality.cs
new file mode 100644
index 000000000..b044a020f
--- /dev/null
+++ b/csharp/app/Backend/Model/TreeNode.Equality.cs
@@ -0,0 +1,24 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace Innovenergy.Backend.Model;
+
+public abstract partial class TreeNode
+{
+    protected Boolean Equals(TreeNode other)
+    {
+        return Id == other.Id && ParentId == other.ParentId;
+    }
+
+    public override Boolean Equals(Object? obj)
+    {
+        if (ReferenceEquals(null, obj)) return false;
+        if (ReferenceEquals(this, obj)) return true;
+        return obj.GetType() == GetType() && Equals((TreeNode)obj);
+    }
+
+    [SuppressMessage("ReSharper", "NonReadonlyMemberInGetHashCode")]
+    public override Int32 GetHashCode()
+    {
+        return HashCode.Combine(Id, ParentId);
+    }
+}
\ No newline at end of file
diff --git a/csharp/app/Backend/Model/TreeNode.cs b/csharp/app/Backend/Model/TreeNode.cs
index 1daf30f74..b3cf22170 100644
--- a/csharp/app/Backend/Model/TreeNode.cs
+++ b/csharp/app/Backend/Model/TreeNode.cs
@@ -2,33 +2,20 @@ using SQLite;
 
 namespace Innovenergy.Backend.Model;
 
-public abstract class TreeNode
+public abstract partial class TreeNode
 {
     [PrimaryKey, AutoIncrement]
     public Int64  Id          { get; set; }
     public String Name        { get; set; } = "";
     public String Information { get; set; } = "";  // unstructured random info
 
-    protected Boolean Equals(TreeNode other)
-    {
-        return Id == other.Id && ParentId == other.ParentId;
-    }
-
-    public override Boolean Equals(Object? obj)
-    {
-        if (ReferenceEquals(null, obj)) return false;
-        if (ReferenceEquals(this, obj)) return true;
-        return obj.GetType() == this.GetType() && Equals((TreeNode)obj);
-    }
-
-    public override Int32 GetHashCode()
-    {
-        return HashCode.Combine(Id, ParentId);
-    }
-
     [Indexed] // parent/child relation
     public Int64  ParentId { get; set; }    
 
     [Ignore]  // not in DB, can be used in typescript as type discriminator
     public String Type => GetType().Name;     
+    
+    [Ignore]  
+    public IReadOnlyList<TreeNode>? Children { get; set; }
+    
 }
\ No newline at end of file
diff --git a/csharp/app/Backend/program.cs b/csharp/app/Backend/Program.cs
similarity index 81%
rename from csharp/app/Backend/program.cs
rename to csharp/app/Backend/Program.cs
index 26c44b71c..fd0206737 100644
--- a/csharp/app/Backend/program.cs
+++ b/csharp/app/Backend/Program.cs
@@ -3,9 +3,9 @@ using Microsoft.OpenApi.Models;
 
 namespace Innovenergy.Backend;
 
-public class Program
+public static class Program
 {
-    public static void Main(string[] args)
+    public static void Main(String[] args)
     {
         using (var db = Db.Connect())
             db.CreateFakeRelations();
@@ -18,10 +18,11 @@ public class Program
         builder.Services.AddHttpContextAccessor(); 
         builder.Services.AddEndpointsApiExplorer();
         builder.Services.AddCors(o => o.AddDefaultPolicy(p => p.WithOrigins("*").AllowAnyHeader().AllowAnyMethod()));
-        builder.Services.AddSwaggerGen(config =>
+        builder.Services.AddSwaggerGen(c =>
         {
-            config.SwaggerDoc("v1", new OpenApiInfo{ Title = "My API", Version = "V1" });
-            config.OperationFilter<HeaderFilter>();   //Todo testing throw me out
+            c.SwaggerDoc("v1", new OpenApiInfo { Title = "InnovEnergy Backend API", Version = "v1" });
+            c.UseAllOfToExtendReferenceSchemas();
+            c.OperationFilter<HeaderFilter>();   //Todo testing throw me out
         });