diff --git a/public_html/deployment/classes/logger.class.php b/public_html/deployment/classes/logger.class.php
index 7da8dacbac4cf19a9870bb2b55f62ae4bb852673..b42a41c5ffe7418ac81703d602da5b19058954c7 100644
--- a/public_html/deployment/classes/logger.class.php
+++ b/public_html/deployment/classes/logger.class.php
@@ -2,23 +2,53 @@
 
 /**
  * Debug logging during a client request.
- *
- * @author hahn
+ * So you can measure any action find bottlenecks in your code.
+ * 
+ * Source: https://github.com/axelhahn/ahlogger
+ * 
+ * USAGE:
+ * (1) Trigger a message with add() to add a marker
+ * (2) The render() method lists all items in a table with time since start
+ *     and the delta to the last message. 
+ * 
+ * @author www.axel-hahn.de
  */
 class logger {
-    protected $aMessages=array();
-    protected $bShowDebug=true;
-    protected $_iMemStart = false;
 
+    protected $aMessages = [];
+    protected $bShowDebug = false;
+    protected $_iMemStart = false;
 
     /**
      * constuctor
      * @param  string $sInitMessage  init message
      * @return boolean
      */
-    public function __construct($sInitMessage="Logger was initialized.") {
+    public function __construct($sInitMessage = "Logger was initialized.") {
         $this->_iMemStart=memory_get_usage();
+        $this->enableDebug(true);
         $this->add($sInitMessage);
+        $this->sCssPrefix='debug-'.md5(microtime(true));
+        return true;
+    }
+
+    /**
+     * add a logging message
+     * @param type $sMessage
+     * @param type $sLevel
+     * @return boolean
+     */
+    public function add($sMessage, $sLevel = "info") {
+        if (!$this->bShowDebug){
+            return false;
+        }        
+        $this->aMessages[] = array(
+            'time' => microtime(true),
+            'message' => $sMessage,
+            'level' => preg_replace('/[^a-z0-9\-\_]/', '', $sLevel),
+            'memory' => memory_get_usage()
+        );
+
         return true;
     }
 
@@ -27,13 +57,13 @@ class logger {
      * @param type $bEnable
      * @return type
      */
-    public function enableDebug($bEnable=false){
-        return $this->bShowDebug=$bEnable;
+    public function enableDebug($bEnable=true){
+        return $this->bShowDebug=!!$bEnable;
     }
 
     /**
      * enable client debugging by a given array of allowed ip addresses
-     * @param array $aIpArray
+     * @param array $aIpArray list of ip addresses in a flat array
      * @return boolean
      */
     public function enableDebugByIp($aIpArray){
@@ -46,107 +76,197 @@ class logger {
         }
     }
 
-    /**
-     * add a logging message
-     * @param type $sMessage
-     * @param type $sLevel
-     * @return boolean
-     */
-    public function add($sMessage, $sLevel="info"){
-        if (!$this->bShowDebug){
-            return false;
-        }
-        global $aCfg;
-        $this->aMessages[]=array(
-            'time'=>microtime(true), 
-            'message'=>$sMessage, 
-            'level'=>$sLevel
-        );
-        if ($sLevel=="MAIL"){
-            mail($aCfg["emailDeveloper"], "studmed - booking tool - Logmessage", $sMessage);
-        }
-        
-        return true;
-    }
-    
-    /**
-     * render output of all logging messages
-     */
-    public function render(){
-        if (!$this->bShowDebug){
-            return false;
-        }
-        $sOut='';
+    protected function _prepareRendering(){
         $iMem=memory_get_usage();
         $this->add('<hr>');
         $this->add('Memory on start: ' . number_format($this->_iMemStart, 0, '.', ',') . " bytes");
         $this->add('Memory on end: '   . number_format($iMem, 0, '.', ',') . " bytes");
         $this->add('Memory peak: '  . number_format(memory_get_peak_usage(), 0, '.', ',') . " bytes");
 
-        $sStarttime=$this->aMessages[0]["time"];
-        
-        $iCounter=0;
-        $sMaxRowId=false;
-        $iMaxtime=-1;
-        $sWarnings=false;
-        
-        $iLasttime=$sStarttime;
-        
-        foreach ($this->aMessages as $aLogentry){
+        $aReturn=[
+            'totaltime' => false,
+            'level' => false,
+            'warnings' => '',
+            'errors' => '',
+            'maxrowid' => false,
+            'maxtime' => false,
+            'result' => []
+        ];
+        $sStarttime = $this->aMessages[0]["time"];
+        $iLasttime = $sStarttime;
+        $iCounter = 0;
+        $sMaxRowId = false;
+        $iMaxtime = -1;
+        $iMaxmem = -1;
+        $bHasWarning = false;
+        $bHasError = false;
+
+        foreach ($this->aMessages as $aLogentry) {
             $iCounter++;
-            $sTrId='debugTableRow'.$iCounter;
-            $iDelta=$aLogentry["time"]-$iLasttime;
-            if ($iDelta > $iMaxtime){
-                $iMaxtime=$iDelta;
-                $sMaxRowId=$sTrId;
+
+            if($aLogentry["level"]=="warning"){
+                $bHasWarning=true;
+            }
+            if($aLogentry["level"]=="error"){
+                $bHasError=true;
+            }
+
+            $sTrId = $this->sCssPrefix.'debugTableRow' . $iCounter;
+            $iDelta = $aLogentry["time"] - $iLasttime;
+            if ($iDelta > $iMaxtime) {
+                $iMaxtime = $iDelta;
+                $sMaxRowId = $sTrId;
+            }
+            $iMaxmem=max($aLogentry["memory"], $iMaxmem);
+
+
+            if (($iDelta > 1) || $aLogentry["level"] == "warning") {
+                $aReturn['warnings'].='<a href="#' . $sTrId . '" title="' . sprintf("%01.4f", $iDelta) . ' s">' . $iCounter . '</a>&nbsp;';
             }
-            
-            
-            $sStyle=($iDelta > 1)?'color: #f82;':'';
-            if (($iDelta > 1)){
-                $sWarnings.='<a href="#'.$sTrId.'" title="'.sprintf("%01.4f", $iDelta).' s">'.$iCounter.'</a>&nbsp;';
+            if ($aLogentry["level"] == "error") {
+                $aReturn['errors'].='<a href="#' . $sTrId . '" title="' . sprintf("%01.4f", $iDelta) . ' s">' . $iCounter . '</a>&nbsp;';
             }
-            $sOut.='<tr class="'.$aLogentry["level"].'" id="'.$sTrId.'" style="'.$sStyle.'">'.
-                   '<td>'.$iCounter.'</td>'.
-                   '<td>'.sprintf("%01.3f", $aLogentry["time"]-$sStarttime).'</td>'.
-                   '<td>'.sprintf("%01.3f", $iDelta).'</td>'.
-                   '<td>'.$aLogentry["level"].'</td>'.
-                   '<td>'.$aLogentry["message"].'</td>'.
-                   '</tr>';
-            $iLasttime=$aLogentry["time"];
+            $aReturn['entries'][]=[
+                'time'=>$aLogentry["time"],
+                'level'=>$aLogentry["level"],
+                'message'=>$aLogentry["message"],
+                'memory'=>sprintf("%01.2f", $aLogentry["memory"]/1024/1024), // MB
+
+                'trid'=>$sTrId,
+                'trclass'=>$aLogentry["level"],
+                'counter'=>$iCounter,
+                'timer'=>sprintf("%01.3f", $aLogentry["time"] - $sStarttime),
+                'delta'=>sprintf("%01.0f", $iDelta*1000),
+            ];
+            $iLasttime = $aLogentry["time"];
+        }
+        $aReturn['level']=($bHasWarning
+            ? ($bHasError ? 'error' : 'warning')
+            : ''
+        );
+        $aReturn['maxrowid']=$sMaxRowId;
+        $aReturn['maxtime']=sprintf("%01.3f", $iMaxtime);
+        $aReturn['maxmem']=sprintf("%01.2f", $iMaxmem/1024/1024);
+        $aReturn['totaltime']=sprintf("%01.3f", $aLogentry['time']-$aReturn['entries'][0]['time']);
+        return $aReturn;
+    }
+
+    /**
+     * get html code for a progressbar with divs
+     * @param  {int|float}  $iVal  value between 0..max value
+     * @param  {int|float}  $iMax  max value
+     * @return {string}
+     */
+    protected function _getBar($iVal, $iMax){
+        $iWidth=$iVal/$iMax*100;
+        return '<div class="bar"><div class="progress" style="width: '.$iWidth.'%;">&nbsp;</div></div>';
+    }
 
+    /**
+     * render output of all logging messages
+     */
+    public function render() {
+        if (!$this->bShowDebug){
+            return false;
         }
-        $iTotal=$iLasttime-$sStarttime;
-        if ($sWarnings){
-            $sWarnings='<br>warnings:&nbsp;'.$sWarnings;
+        $aData=$this->_prepareRendering();
+
+        /*
+        Array
+        (
+            [totaltime] => 0.006
+            [errors] =>  
+            [warnings] => 3 
+            [maxrowid] => debugTableRow3
+            [maxtime] => 0.005
+            [result] => Array
+                (
+                )
+
+            [entries] => Array
+                mit Elementen
+                Array
+                    (
+                        [time] => 1663959608.2566
+                        [level] => info
+                        [message] => Logger was initialized.
+                        [memory] => 538056
+                        [trid] => debugTableRow1
+                        [trclass] => info
+                        [trstyle] => 
+                        [counter] => 1
+                        [timer] => 0.000
+                        [delta] => 0.000
+                    )
+        */
+
+        $sOut='';
+        // echo '<pre>'; print_r($aData); die();
+        foreach ($aData['entries'] as $aLogentry){
+            $sOut.='<tr class="'.$this->sCssPrefix.'-level-' . $aLogentry["level"] . ''.($aLogentry["trid"]==$aData["maxrowid"] ? ' '.$this->sCssPrefix.'-maxrow' : '').'" '
+                .'id="' . $aLogentry["trid"] . '">' .
+                    '<td>' . $aLogentry["counter"] . '</td>' .
+                    '<td>' . $aLogentry["level"] . '</td>' .
+                    '<td>' . $aLogentry["timer"] . '</td>' .
+                    '<td>' . $this->_getBar($aLogentry["delta"], $aData["maxtime"]*1000). $aLogentry["delta"] .' ms</td>' .
+                    '<td>' . $this->_getBar($aLogentry["memory"], $aData["maxmem"]) . $aLogentry["memory"] .' MB'. '</td>' .
+                    '<td>' . $aLogentry["message"] . '</td>' .
+                    '</tr>';
         }
-        
-        if ($sOut) $sOut='
-            <div style="position: fixed; right: 1em; top: 6em; background: rgba(255,80,80, 0.1); padding: 0.5em;">
-                <span style="font-size: 130%;">total:&nbsp;'.sprintf("%01.3f", $iTotal).'&nbsp;s</span><br>
-                <span>longest&nbsp;action:&nbsp;<a href="#'.$sMaxRowId.'">'.sprintf("%01.3f", $iMaxtime).'&nbsp;s</a></span>
-                <span>'.$sWarnings.'</span>
+        if ($sOut){
+            $sOut = '
+            <style>
+                .'.$this->sCssPrefix.'-info          {position: fixed; top: 6em; right: 1em; background: rgba(200,228,255, 0.8); border: 1px solid; z-index: 99999;}
+                .'.$this->sCssPrefix.'-info .head    {background: rgba(0,0,0,0.4); color: #fff;padding: 0em 0.5em 0.2em; }
+                .'.$this->sCssPrefix.'-info .content {padding: 0.5em; }
+                .'.$this->sCssPrefix.'-info .content .total {font-size: 160%; color: rgba(0,0,0,0.5); margin: 0.3em 0; display: inline-block;}
+
+                .'.$this->sCssPrefix.'-messages {margin: 5em 2em 2em;}
+                .'.$this->sCssPrefix.'-messages .bar      {background: rgba(0,0,0,0.03); height: 1.4em; position: absolute; width: 6em; border-right: 1px solid rgba(0,0,0,0.2);}
+                .'.$this->sCssPrefix.'-messages .progress {background: rgba(100,140,180,0.2); height: 1.4em; padding: 0;}
+                .'.$this->sCssPrefix.'-messages table{background: #fff; color: #222;table-layout:fixed; }
+                .'.$this->sCssPrefix.'-messages table th{background: none;}
+                .'.$this->sCssPrefix.'-messages table th.barcol{min-width: 7em; position: relative;}
+                .'.$this->sCssPrefix.'-messages table td{padding: 3px; vertical-align: top;}
+                .'.$this->sCssPrefix.'-messages table th:hover{background:#aaa !important;}
+
+                .'.$this->sCssPrefix.'-level-info{background: #e0e8f8; color:#124}
+                .'.$this->sCssPrefix.'-level-warning{background: #fcf8e3; color: #980;}
+                .'.$this->sCssPrefix.'-level-error{background: #fce0e0; color: #944;}
+                .'.$this->sCssPrefix.'-maxrow{color:#f33; font-weight: bold;}
+            </style>
+            <div class="'.$this->sCssPrefix.' '.$this->sCssPrefix.'-info '.$this->sCssPrefix.'-level-'.$aData['level'].'">
+                <div class="head">ahLogger</div>
+                <div class="content">
+                    <span class="total">⏱️ ' . $aData['totaltime'] . '&nbsp;s</span><br>
+                    🪲 <a href="#'.$this->sCssPrefix.'-messages">Debug infos</a> | 🔺 <a href="#">top</a><br>
+                    <span>longest&nbsp;action: ⏱️&nbsp;<a href="#' . $aData['maxrowid'] . '">' . ($aData['maxtime']*1000) . '&nbsp;ms</a></span>
+                    ' . ($aData['errors'] ? '<br><span>‼️ Errors: '.$aData['errors'] . '</span>' : '').'
+                    ' . ($aData['warnings'] ? '<br><span>⚠️ Warnings: '.$aData['warnings'] . '</span>' : '').'
+                </div>
             </div>
-            <br>
-            <br>
-            <br>
-            <br>
-            <br>
-            <h3>DEBUG</h3><br>
-            <table class="datatable table table-striped debugtable">
+
+            <div id="'.$this->sCssPrefix.'-messages" class="'.$this->sCssPrefix.' '.$this->sCssPrefix.'-messages">
+            DEBUG :: LOG MESSAGES<br>'
+            . ($aData['errors']   ? '<span>Errors: '.$aData['errors'] . '</span><br>' : '')
+            . ($aData['warnings'] ? '<span>Warnings: '.$aData['warnings'] . '</span><br>' : '')
+            .'<br>
+            <table >
             <thead>
             <tr>
                 <th>#</th>
-                <th>delta to start time</th>
-                <th>delta to previuos</th>
                 <th>level</th>
+                <th>time [s]</th>
+                <th class="barcol">delta</th>
+                <th class="barcol">memory</th>
                 <th>message</th>
             </tr></thead><tbody>
-            '.$sOut.'</tbody></table>'
-                . '<script>$(\'#'.$sMaxRowId.'\').css(\'color\', \'#f00\');</script>';
+            ' . $sOut . '</tbody></table>'
+            ;
+		}
         return $sOut;
     }
-    /**
+   /**
      * render output of all logging messages for cli output
      * @return string
      */
@@ -154,32 +274,19 @@ class logger {
         if (!$this->bShowDebug){
             return false;
         }
+        $aData=$this->_prepareRendering();
+
         $sOut='';
-        $sStarttime=$this->aMessages[0]["time"];
-        
-        $iCounter=0;
-        $sMaxRowId=false;
-        $iMaxtime=-1;
-        $sWarnings=false;
-        
-        $iLasttime=$sStarttime;
-        
-        foreach ($this->aMessages as $aLogentry){
-            $iCounter++;
-            $iDelta=$aLogentry["time"]-$iLasttime;
-            $sOut.=$aLogentry["level"].' '
-                   . $iCounter.' '
-                   .sprintf("%01.3f", $aLogentry["time"]-$sStarttime).' '
-                   .sprintf("%01.3f", $iDelta).' '
-                   .$aLogentry["level"].' '
+        foreach ($aData['entries'] as $aLogentry){
+            $sOut.=$aLogentry["timer"].' | '
+                    .$aLogentry["delta"].' ms | '
+                    .$aLogentry["level"].' | '
+                    .(sprintf("%01.3f", $aLogentry["memory"]/1024/1024)).' MB | '
                    .$aLogentry["message"].' '
                    . "\n"
                    ;
-            $iLasttime=$aLogentry["time"];
-
         }
-        // $iTotal=$iLasttime-$sStarttime;
+        $sOut.="\nTotal time: ".$aData['totaltime'] . "\n";
         return $sOut;
     }
 }
-