diff --git a/Layout/default/footer.php b/Layout/default/footer.php
index e18e6fa8b..58916a8d7 100644
--- a/Layout/default/footer.php
+++ b/Layout/default/footer.php
@@ -7,7 +7,7 @@
             <div class="container-fluid">
                 <div class="row">
                     <div class="col-md-6 <?=(MFAPPNAME == "devthetool") ? "text-danger" : ""?>">
-                      <span title="<?=MFAPPNAME?>">the tool &copy; <?=date('Y')?></span> <a href="https://www.xinon.at">Xinon GmbH</a>
+                      <span title="<?=MFAPPNAME?>">the to<span class="secondO">o</span>l &copy; <?=date('Y')?></span> <a href="https://www.xinon.at">Xinon GmbH</a>
                     </div>
                     
                 </div>
@@ -36,6 +36,111 @@
                     $(this).parent('li').toggleClass('open').find('.submenu:first').toggleClass('open');
                 }
             });
+            
+            <?php if($me->can("Superexpert")): ?>
+              $(".secondO").addClass("pointer");
+              
+              var se_to = 0;
+              var se_intv;
+              var se_notf;
+              $(".footer .secondO").click(function() {
+                if(!se_to) {
+                  $.post("<?=self::getUrl("User", "api")?>",{
+                    do: "sse"
+                  },
+                  function(success) {
+                    if(!("status" in success)) return;
+                    if(success.status == "OK") {
+                      if(!("result" in success)) return;
+                      if(!("valid_to" in success.result) || !success.result.valid_to) return;
+
+                      se_to = success.result.valid_to;
+                      addSeMark();
+                      se_intv = setInterval(checkSe, 1000);
+                      location.reload();
+                    }
+                  },
+                  "json");
+                }
+              });
+
+              function checkSe() {
+                var now = Math.floor(Date.now() / 1000);
+                if(!se_to || se_to < 0) {
+                  clearInterval(se_intv);
+                  se_to = null;
+                  $("#se_notf").remove();
+                  removeSeMark();
+                  return;
+                }
+                var rest_duration = se_to - now;
+
+                if(rest_duration <= 0) {
+                  clearInterval(se_intv);
+                  se_to = null;
+                  $("#se_notf").remove();
+                  removeSeMark();
+                  return;
+                }
+
+                if(rest_duration < 60*5) {
+                  // show notification
+                  if($("#se_notf").length) {
+                    $("#se_notf .time").text(rest_duration);
+                  } else {
+                    var notf_html = $('<div class="fixed-top alert alert-warning mx-4 mt-3" id="se_notf" style="width: 50vh;">Achtung: Noch <span class="time">' + rest_duration +'</span> Sekunden. <a href="#" onclick="extSe()">Jetzt verlängern!</a></div>');
+                    $("body").prepend(notf_html);
+                  }
+
+                }
+              }
+              
+              function extSe() {
+                console.log("in ese");
+                $.post("<?=self::getUrl("User", "api")?>", {
+                    do: "ese"
+                  },
+                  function(success) {
+                    if(!("result" in success)) return;
+                    if(!("valid_to" in success.result) || !success.result.valid_to) return;
+                    se_to = success.result.valid_to;
+                  },
+                  "json"
+                );
+              }
+              
+              function endSe() {
+                $.post("<?=self::getUrl("User", "api")?>", {
+                    do: "endse"
+                  },
+                  function(success) {
+                    if(!("result" in success)) return;
+                    if(!("valid_to" in success.result)) return;
+                    se_to = success.result.valid_to;
+                    location.reload();
+                  },
+                  "json"
+                );
+              }
+              
+              function addSeMark() {
+                if(!$("#se-mark").length) {
+                 $("#topbar").append('<li id="SeMark"><a class="nav-link dropdown-toggle text-danger" href="#" role="button" aria-haspopup="false" aria-expanded="false" onclick="endSe(); return false;" title="Beenden"><i class="fas fa-crown"></i></a></li>');
+                }
+              }
+              
+              function removeSeMark() {
+                $("#SeMark").remove();
+              }
+              
+              <?php if($me->superexpertEnabled()): ?>
+                addSeMark();
+                if(!se_intv) {
+                  se_to = <?=$me->flags["superexpert_lock_date"]?>;
+                  setInterval(checkSe, 1000);
+                }
+              <?php endif; ?>
+            <?php endif; ?>
         </script>
     </body>
 </html>
\ No newline at end of file
diff --git a/Layout/default/topbar.php b/Layout/default/topbar.php
index 1bb203247..07ae03c02 100644
--- a/Layout/default/topbar.php
+++ b/Layout/default/topbar.php
@@ -1,7 +1,7 @@
 <!-- Topbar Start -->
 <div class="navbar-custom">
   <div class="container-fluid">
-    <ul class="list-unstyled topnav-menu float-right mb-0">
+    <ul class="list-unstyled topnav-menu float-right mb-0" id="topbar">
 
       <li class="dropdown notification-list">
         <!-- Mobile menu toggle-->
@@ -14,7 +14,7 @@
         </a>
         <!-- End mobile menu toggle-->
       </li>
-
+      
       <li class="dropdown notification-list">
         <a class="nav-link dropdown-toggle" data-toggle="adropdown" href="#" role="button" aria-haspopup="false" aria-expanded="false">
           <i class="fe-bell noti-icon"></i>
diff --git a/application/User/User.php b/application/User/User.php
index c9d2bbcd3..b4cdc27e1 100644
--- a/application/User/User.php
+++ b/application/User/User.php
@@ -144,6 +144,62 @@ class User extends mfBaseModel {
     return true;
   }
   
+  public function superexpertStart($duration = 1800) {
+    if(!$this->can("Superexpert")) return false;
+    
+    $ts = $this->getFlag("superexpert_lock_date");
+    $ts->value(date("U") + $duration);
+    $ts->save();
+    
+    return true;
+  }
+  
+  public function superexpertStop($duration = 1800) {
+    if(!$this->can("Superexpert")) return false;
+    
+    $ts = $this->getFlag("superexpert_lock_date");
+    $ts->value(0);
+    $ts->save();
+    
+    return true;
+  }
+  
+  public function superexpertExtend($duration = 1800) {
+    if(!$this->can("Superexpert")) return false;
+    
+    $ts = $this->getFlag("superexpert_lock_date");
+    $ts->value(date("U") + $duration);
+    $ts->save();
+    
+    return true;
+  }
+  
+  public function superexpertEnabled() {
+    if(!$this->can("Superexpert")) return false;
+    
+    $tsFlag = $this->getFlag("superexpert_lock_date");
+    $ts = $tsFlag->value();
+    
+    if(!is_numeric($ts) || !$ts) {
+      return false;
+    }
+    
+    $now = date("U");
+    
+    // if superexpert is longer than 60 minutes -> disable
+    if($ts > $now + 3601) {
+      $tsFlag->value(null);
+      $tsFlag->save();
+      return false;
+    }
+    
+    if($ts > $now) {
+      return true;
+    }
+    
+    return false;
+  }
+  
   public function getFlag($name) {
     return new WorkerFlag($this->id, $name);
   }
diff --git a/application/User/UserController.php b/application/User/UserController.php
index d2dffaf68..6ee1c0352 100644
--- a/application/User/UserController.php
+++ b/application/User/UserController.php
@@ -109,8 +109,7 @@ class UserController extends mfBaseController
     {
 
     }
-
-
+    
     protected function saveAction()
     {
         $r = $this->request;
@@ -342,4 +341,75 @@ class UserController extends mfBaseController
 
         return $me->isAdmin();
     }
+    
+    protected function apiAction() {
+      if(!$this->me->is(["Admin"])) {
+        $this->redirect("Dashboard");
+      }
+      $do = $this->request->do;
+      $data = [];
+      
+      switch($do) {
+        case "sse":
+          $return = $this->startSuperexpertApi();
+          break;
+        case "ese":
+          $return = $this->extendSuperexpertApi();
+          break;
+        case "endse":
+          $return = $this->endSuperexpertApi();
+          break;
+        default:
+          $return = false;
+      }
+
+      if(!is_array($return) || !count($return)) {
+        $data = ["status" => "error"];
+        $this->returnJson($data);
+      }
+      $data['status'] = "OK";
+      $data['result'] = $return;
+      $this->returnJson($data);
+    }
+    
+    private function startSuperexpertApi() {
+      $me = new User();
+      $me->loadMe();
+      
+      if($me->superexpertEnabled() ) {
+        // superexpert mode started already
+        return false;
+      }
+      
+      $me->superexpertStart(1800);
+      
+      return ["valid_to" => $me->getFlag("superexpert_lock_date")->value()];
+    }
+    
+    private function extendSuperexpertApi() {
+      $me = new User();
+      $me->loadMe();
+      
+      if(!$me->superexpertEnabled() ) {
+        // superexpert mode must be started already
+        $this->log->debug("se not started");
+        return false;
+      }
+      $this->log->debug("ese");
+      $me->superexpertExtend(1800);
+      
+      return ["valid_to" => $me->getFlag("superexpert_lock_date")->value()];
+    }
+    
+    private function endSuperexpertApi() {
+      $me = new User();
+      $me->loadMe();
+      
+      if($me->superexpertEnabled() ) {
+        $me->superexpertStop();
+      }
+      
+      
+      return ["valid_to" => null];
+    }
 }
diff --git a/db/migrations/20240305143620_worker_permission_addcan_superexpert.php b/db/migrations/20240305143620_worker_permission_addcan_superexpert.php
new file mode 100644
index 000000000..dd1eb90ba
--- /dev/null
+++ b/db/migrations/20240305143620_worker_permission_addcan_superexpert.php
@@ -0,0 +1,31 @@
+<?php
+declare(strict_types=1);
+
+use Phinx\Migration\AbstractMigration;
+
+final class WorkerPermissionAddcanSuperexpert extends AbstractMigration
+{
+    public function up(): void
+    {
+        if($this->getEnvironment() == "thetool") {
+          $table = $this->table("WorkerPermission");
+          $table->addColumn("canSuperexpert", "enum", ["null" => false,"values" => 'false,true', "default" => "false", "after" => "canStatistics"]);
+          $table->update();
+        }
+        
+        if($this->getEnvironment() == "addressdb") {
+          
+        }
+    }
+
+    public function down(): void
+    {
+        if($this->getEnvironment() == "thetool") {
+          $this->table("WorkerPermission")->removeColumn("canSuperexpert")->save();
+        }
+        
+        if($this->getEnvironment() == "addressdb") {
+          
+        }
+    }
+}
diff --git a/scripts/test.php b/scripts/test.php
index 9ccb8a446..faf2a0396 100644
--- a/scripts/test.php
+++ b/scripts/test.php
@@ -15,6 +15,5 @@ $me = new User(1);
 define("INTERNAL_USER_ID", $me->id);
 define("INTERNAL_USER_USERNAME", $me->username);
 
-foreach(PreorderModel::searchActive(["adb_hausnummer_id" => 1788466, "<status_code" => 145]) as $preorder) {
-  echo $preorder->id."\n";
-}
+$netzgebiet = new ADBNetzgebiet(45);
+var_dump($netzgebiet->getOption("hausnummer_dont_overwrite_netzgebiet"));
\ No newline at end of file