diff --git a/build/api/core/Request.php b/build/api/core/Request.php
index dce1f28..f9a9ac3 100755
--- a/build/api/core/Request.php
+++ b/build/api/core/Request.php
@@ -5,7 +5,8 @@
 	use \api\core\AuthSystem;
 	use \api\core\ModuleFactory;
 	use \api\core\Config;
-	use \error\core\Error;
+use database\core\Repo;
+use \error\core\Error;
 	use \error\core\Err;
 
 
@@ -503,6 +504,11 @@
 			/* (3) On ajoute les données */
 			$response->appendAll($returned);
 
+			/* (4) Si le Debug est actif on ajoute le debug des repo */
+			if(Repo::isDebugEnabled()){
+				$response->append("repoDebug" , Repo::getDebug());
+			}
+
 			/* (4) On retourne la réponse */
 			return $response;
 
diff --git a/build/api/module/excelController.php b/build/api/module/excelController.php
index 6c786e5..2e1fb4b 100644
--- a/build/api/module/excelController.php
+++ b/build/api/module/excelController.php
@@ -63,9 +63,11 @@ class excelController
 				$addEU = function() use (&$UECode,&$allUE,&$UE){
 					//determine if UE is disabled (if cours+td+tp = 0)
 					$totalVH = 0;
-					foreach ($UE["groups"] as $groups){
-						foreach ($groups as $group){
-							$totalVH += $group["VH"];
+					if(is_array($UE["groups"]) && count($UE["groups"]) > 0){
+						foreach ($UE["groups"] as $groups){
+							foreach ($groups as $group){
+								$totalVH += $group["VH"];
+							}
 						}
 					}
 
@@ -428,7 +430,8 @@ class excelController
 
 				Repo::flushStack();
 
-				return [ 'data' => ["professors" => $allProf, "formations" => $allFormations, "UEs" => $allUE ] ];
+				//return [ 'data' => ["professors" => $allProf, "formations" => $allFormations, "UEs" => $allUE ] ];
+				return["data" => true];
 			}catch (Exception $e){
 				return [ 'error' => new Error(Err::UnknownError) ];
 			}
diff --git a/build/database/core/DatabaseDriver.php b/build/database/core/DatabaseDriver.php
index 7ffe06d..695b06d 100755
--- a/build/database/core/DatabaseDriver.php
+++ b/build/database/core/DatabaseDriver.php
@@ -61,7 +61,7 @@
 		* @password<String> 									Database password
 		*
 		*/
-		private function __construct($host, $dbname, $username, $password){
+		private function __construct($host, $dbname, $username, $password, $debug = false){
 			/* (2) Stores configuration */
 			$this->host     = $host;
 			$this->dbname   = $dbname;
@@ -79,6 +79,10 @@
 				$this->pdo->setAttribute(\PDO::ATTR_STRINGIFY_FETCHES, false);
 				$this->pdo->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);
 
+				if($debug){
+					$this->pdo->enableDebug();
+				}
+
 				// On signale que tout s'est bien passe
 				$this->error = new Error(Err::Success);
 
@@ -120,7 +124,7 @@
 
 				/* (1) If local -> instanciates with local configuration */
 				// if( !checkdnsrr($_SERVER['SERVER_NAME'], 'NS') )
-					self::$instance[$label] = new DatabaseDriver($conf[$label]['local']['host'], $conf[$label]['local']['dbname'], $conf[$label]['local']['user'], $conf[$label]['local']['password']);
+					self::$instance[$label] = new DatabaseDriver($conf[$label]['local']['host'], $conf[$label]['local']['dbname'], $conf[$label]['local']['user'], $conf[$label]['local']['password'],$conf[$label]['local']['debug']);
 				/* (2) If Remote -> instanciates with Remote configuration */
 				// else
 				// 	self::$instance[$label] = new DatabaseDriver($conf[$label]['remote']['host'], $conf[$label]['remote']['dbname'], $conf[$label]['remote']['user'], $conf[$label]['remote']['password']);
@@ -204,6 +208,14 @@
 			$this->pdo->executeStack();
 		}
 
+		public function getDebug() : array{
+			return $this->pdo->getDebug();
+		}
+
+		public function isDebugEnabled() : bool {
+			return $this->pdo->isDebugEnabled();
+		}
+
 
 
 	}
diff --git a/build/database/core/PDOWrapper/PDOWrapper.php b/build/database/core/PDOWrapper/PDOWrapper.php
index d8526c2..5674744 100644
--- a/build/database/core/PDOWrapper/PDOWrapper.php
+++ b/build/database/core/PDOWrapper/PDOWrapper.php
@@ -13,6 +13,8 @@ class PDOWrapper extends \PDO
 {
 	private $statements = [];
 	private $stacking = false;
+	private $debug = [];
+	private $debugEnabled = false;
 
     public function __construct(String $dsn, String $username, String $passwd, array $options = [])
     {
@@ -21,6 +23,10 @@ class PDOWrapper extends \PDO
 
     public function prepare($statement, $options = [])
     {
+    	if($this->debugEnabled){
+			$this->storeDebug();
+		}
+
         if($this->stacking){
             return new PDOStatementWrapper($statement, $this);
         }else{
@@ -30,14 +36,64 @@ class PDOWrapper extends \PDO
         }
     }
 
+    private function storeDebug(){
+    	//get all the debug info about the repo
+		$prepareStack = debug_backtrace(0,3)[1];
+		$stack = debug_backtrace(0,3)[2];
+		//create the reflection object
+		$f = new \ReflectionMethod($stack["class"],$stack["function"]);
+		//get only the repo name
+		$className = explode("\\",$stack["class"]);
+		$className = $className[count($className)-1];
+
+		$result = [];
+
+		//if we are flushing a stack, just count the number of request stacked
+		if($stack["function"] == "executeStack"){
+
+			$result["StackedRequest"] = true;
+			$result["numberOfStackedRequest"] = substr_count($prepareStack["args"][0],";");
+		//if we are not stacking, log the repo call
+		}else if(!$this->stacking){
+			//store results
+			$result["repoName"] = $className;
+			$result["methodName"] = $stack["function"];
+			$result["args"] = [];
+
+			foreach ($f->getParameters() as $key => $param) {
+				$result["args"][$param->name] = $stack["args"][$key];
+			}
+		//else we are stacking a request, we should not log it
+		}else{
+			return;
+		}
+
+		$this->debug[] = $result;
+	}
+	public function getDebug() : array{
+    	return $this->debug;
+	}
+
     public function enableStacking(){
     	$this->stacking = true;
 	}
 
+	public function isDebugEnabled() : bool{
+    	return $this->debugEnabled;
+	}
+
 	public function stackStatement(PDOStatementWrapper $st){
 		array_push($this->statements,$st);
 	}
 
+	public function enableDebug(){
+    	$this->debugEnabled = true;
+	}
+
+	public function disableDebug(){
+		$this->debugEnabled = false;
+	}
+
 	public function executeStack(){
 		//init the statements and the generator of number
 		$finalStatement = '';
diff --git a/build/database/core/Repo.php b/build/database/core/Repo.php
index 88b88f7..d5d86f3 100644
--- a/build/database/core/Repo.php
+++ b/build/database/core/Repo.php
@@ -69,6 +69,14 @@
 			static::$driver->flushStack();
 		}
 
+		public static function getDebug() : array{
+			return static::$driver->getDebug();
+		}
+
+		public static function isDebugEnabled() : bool{
+			return static::$driver->isDebugEnabled();
+		}
+
 
 
 
diff --git a/config/database-driver.json b/config/database-driver.json
index fb2da3c..0c99f5d 100755
--- a/config/database-driver.json
+++ b/config/database-driver.json
@@ -4,7 +4,8 @@
 			"host"     : "mariadb",
 			"dbname"   : "vhost",
 			"user"     : "php",
-			"password" : "4JB1dtbrIC8pT935"
+			"password" : "4JB1dtbrIC8pT935",
+			"debug"    : true
 		},
 		"remote": {
 			"host"     : "db_remote_host",