Fix E2EE decryption issue and duplicate webhook insertion

backend/app/Models/MessageLog.php

@@ -30,6 +30,25 @@ class MessageLog extends BaseModel
             $data['media_url'] = Security::encrypt($data['media_url']);
         }
 
-        return self::create($data);
+        try {
+            return self::create($data);
+        } catch (\PDOException $e) {
+            // Handle duplicate entry gracefully
+            if ($e->getCode() === '23000' || strpos($e->getMessage(), '1062') !== false) {
+                error_log("[MessageLog] Duplicate whatsapp_message_id: " . ($data['whatsapp_message_id'] ?? 'unknown'));
+                // Retrieve and return existing log record
+                if (!empty($data['whatsapp_message_id'])) {
+                    $existing = \App\Core\Database::select(
+                        "SELECT * FROM " . static::$table . " WHERE whatsapp_message_id = ? LIMIT 1",
+                        [$data['whatsapp_message_id']]
+                    );
+                    if (!empty($existing)) {
+                        return $existing[0];
+                    }
+                }
+                return null;
+            }
+            throw $e;
+        }
     }
 }