change clienti to datadb and fixed column pages

public/userarea/class/VisualLimsApiClient.class.php

@@ -29,7 +29,7 @@ class VisualLimsApiClient
         return self::$instance;
     }
 
-    private function authenticate()
+    private function authenticate($retryCount = 0, $maxRetries = 3)
     {
         $ch = curl_init("{$this->baseUrl}/api/authentication/authenticate");
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
@@ -45,16 +45,22 @@ class VisualLimsApiClient
         curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
         curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
         curl_setopt($ch, CURLOPT_VERBOSE, true);
-        $log = fopen(__DIR__ . '/curl_auth_debug.log', 'w') ?: fopen('php://stderr', 'w');
+        $log = fopen(__DIR__ . '/curl_auth_debug.log', 'a') ?: fopen('php://stderr', 'w');
         curl_setopt($ch, CURLOPT_STDERR, $log);
 
         $response = curl_exec($ch);
         $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
         $curl_error = curl_error($ch);
+        $log_message = date('Y-m-d H:i:s') . " - Auth attempt {$retryCount}: HTTP {$http_code}, Error: {$curl_error}, Response: " . substr($response, 0, 1000) . "\n";
+        fwrite($log, $log_message);
         fclose($log);
         curl_close($ch);
 
         if ($response === false || $http_code != 200) {
+            if ($http_code === 400 && strpos($response, 'Cannot persist the object') !== false && $retryCount < $maxRetries) {
+                usleep(500000); // Ritardo di 500ms
+                return $this->authenticate($retryCount + 1, $maxRetries); // Riprova
+            }
             throw new Exception("Autenticazione fallita: HTTP {$http_code}, Errore cURL: {$curl_error}, Risposta: " . substr($response, 0, 1000));
         }
 
@@ -191,5 +197,4 @@ class VisualLimsApiClient
     {
         return $this->baseUrl;
     }
-
 }