diff --git a/configuration.nix b/configuration.nix
index d3aa218..698dc10 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -164,7 +164,7 @@
     export NIX_PATH="nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixos"
 
     LOCAL_PATH="/var/lib/nixos-config"
-    REPO_URL="https://git.skarockoi.de/ska/nixos-production.git"
+    REPO_URL="https://git.skarockoi.de/ska/nixos-production.git "
 
     if [ ! -d "$LOCAL_PATH/.git" ]; then
       mkdir -p "$LOCAL_PATH"
@@ -200,7 +200,7 @@
   };
 
   systemd.timers.nixos-git-update = {
-    description = "Check for config updates hourly";
+    description = "Check for config updates at startup";
     wantedBy = [ "timers.target" ];
     timerConfig = {
       OnBootSec = "60s";
@@ -213,6 +213,18 @@
 
   zramSwap.enable = true;
 
+  ############################################################
+  # USB ROOT DEVICE MONITOR (SHUTDOWN ON DISCONNECT)
+  ############################################################
+
+  # Monitor root device removal and shut down
+  services.udev.extraRules = ''
+    # Match the root filesystem device by label (or use PARTLABEL/UUID if preferred)
+    KERNEL=="sd*", ENV{ID_FS_LABEL}=="nixos-root", SYMLINK+="nixos-root-device"
+    # Trigger when the root device is removed
+    ACTION=="remove", KERNEL=="sd*", ENV{ID_FS_LABEL}=="nixos-root", RUN+="/run/current-system/sw/bin/systemctl poweroff"
+  '';
+
   ############################################################
   # NIXOS VERSION
   ############################################################