diff --git a/app/views/layouts/_sidebar.html.erb b/app/views/layouts/_sidebar.html.erb
index 5c87612..00817f4 100644
--- a/app/views/layouts/_sidebar.html.erb
+++ b/app/views/layouts/_sidebar.html.erb
@@ -27,7 +27,7 @@
     <span class="collapse-text ml-3 transition-all duration-300 ease-in-out max-w-[180px] opacity-100 overflow-hidden whitespace-nowrap">Kategorien</span>
   <% end %>
 
-  <!-- 5. NEU: RÄUME & STANDORTE -->
+  <!-- 5. RÄUME & STANDORTE -->
   <%= link_to rooms_path, class: nav_link_class("rooms") do %>
     <svg class="h-5 w-5 shrink-0 ml-0.5" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
       <path stroke-linecap="round" stroke-linejoin="round" d="M15 10.5a3 3 0 1 1-6 0 3 3 0 0 1 6 0Z" />
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index 8319a06..b1a1e37 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -86,6 +86,31 @@
               Ausloggen
             </span>
           <% end %>
+
+          <% 
+            repo_url = "https://gitea.daboh.ipv64.de/daboh/vault171/"
+            commit_url = CURRENT_COMMIT.present? ? "#{repo_url}/commit/#{CURRENT_COMMIT}" : repo_url
+          %>
+          <%= link_to commit_url, target: "_blank", 
+                      class: "group flex items-center justify-center px-3 py-1 text-[11px] rounded-md text-gray-400 hover:text-gray-700 hover:bg-gray-50/50 transition w-full", 
+                      title: "Aktuelle Git-Revision anzeigen" do %>
+            
+            <!-- Das Icon bleibt klein und zentriert -->
+            <svg class="h-3.5 w-3.5 shrink-0 text-gray-400 group-hover:text-gray-700 transition-colors" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor">
+              <path stroke-linecap="round" stroke-linejoin="round" d="M17.25 6.75 22.5 12l-5.25 5.25m-10.5 0L1.5 12l5.25-5.25m7.5-3-4.5 16.5" />
+            </svg>
+            
+            <!-- Durch 'w-0 group-data-[collapsed]:w-0' oder ähnliche Selektoren blockiert der Text beim Einklappen 0 Pixel Platz -->
+            <span class="collapse-text ml-1.5 transition-all duration-300 ease-in-out max-w-[180px] opacity-100 overflow-hidden whitespace-nowrap font-mono tracking-wider origin-left">
+              <% if CURRENT_COMMIT.present? %>
+                <%= CURRENT_COMMIT %>
+              <% else %>
+                repository
+              <% end %>
+            </span>
+          <% end %>
+          </div>
+
         </div>
 
       </aside>
diff --git a/config/initializers/git_revision.rb b/config/initializers/git_revision.rb
new file mode 100644
index 0000000..ec20518
--- /dev/null
+++ b/config/initializers/git_revision.rb
@@ -0,0 +1,11 @@
+# config/initializers/git_revision.rb
+
+# 1. Versuch: Über eine Umgebungsvariable (Standard bei Docker/Render/Heroku)
+CURRENT_COMMIT = ENV["GIT_COMMIT_SHA"] ||
+                 ENV["RENDER_GIT_COMMIT"] ||
+                 # 2. Versuch: Direkt aus dem lokalen .git Ordner auslesen
+                 begin
+                   `git rev-parse --short HEAD`.strip
+                 rescue
+                   nil
+                 end