From 26f783e835b6e57455374486b00360fd696fbc1d Mon Sep 17 00:00:00 2001
From: OlgunR <OlgunR@DD-PC-ENT05N>
Date: Mon, 19 Jan 2026 11:21:33 +0100
Subject: [PATCH] Prevent catalog title changes during edit

Enforce immutability of CatTitle on updates: backend now rejects title changes with a BadRequest, and frontend disables the title input field when editing.
---
 DbFirst.API/Controllers/CatalogsController.cs | 4 ++++
 DbFirst.BlazorWasm/Pages/Catalogs.razor       | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/DbFirst.API/Controllers/CatalogsController.cs b/DbFirst.API/Controllers/CatalogsController.cs
index b2b0f66..103d386 100644
--- a/DbFirst.API/Controllers/CatalogsController.cs
+++ b/DbFirst.API/Controllers/CatalogsController.cs
@@ -54,6 +54,10 @@ public class CatalogsController : ControllerBase
         {
             return NotFound();
         }
+        if (!string.Equals(current.CatTitle, dto.CatTitle, StringComparison.OrdinalIgnoreCase))
+        {
+            return BadRequest("Titel kann nicht geändert werden.");
+        }
 
         var updated = await _mediator.Send(new UpdateCatalogCommand(id, dto), cancellationToken);
         if (updated == null)
diff --git a/DbFirst.BlazorWasm/Pages/Catalogs.razor b/DbFirst.BlazorWasm/Pages/Catalogs.razor
index 0486b46..2c2ef09 100644
--- a/DbFirst.BlazorWasm/Pages/Catalogs.razor
+++ b/DbFirst.BlazorWasm/Pages/Catalogs.razor
@@ -24,7 +24,7 @@ else if (!string.IsNullOrWhiteSpace(infoMessage))
         <div class="row g-3">
             <div class="col-md-6">
                 <label class="form-label">Titel</label>
-                <InputText class="form-control" @bind-Value="formModel.CatTitle" />
+                <InputText class="form-control" @bind-Value="formModel.CatTitle" disabled="@isEditing" />
             </div>
             <div class="col-md-6">
                 <label class="form-label">Kennung</label>