diff --git a/managers/mongodb_manager.py b/managers/mongodb_manager.py
index 2fe84dd..cafb5ce 100644
--- a/managers/mongodb_manager.py
+++ b/managers/mongodb_manager.py
@@ -123,7 +123,7 @@ class MongoDBArticleCache:
                     'url': article.get_url(),
                     'images': article.get_images(),
                     'modified_at': article.get_modified_at(),
-                    'expiresAt': expires_at,
+                    #'expiresAt': expires_at,
                 }
                 
                 # Preparar user_info
@@ -197,14 +197,18 @@ class MongoDBArticleCache:
                         'notified_at': now,
                         'is_favorite': False,
                     }]
-                    new_article_data['createdAt'] = now
-                    new_article_data['updatedAt'] = now
                     
+                    # Usar $setOnInsert para createdAt y updatedAt
+                    # Solo se establecerán si el documento es nuevo (insert), no si ya existe (update)
                     operations.append(
                         UpdateOne(
                             {'platform': platform, 'id': article_id},
                             {
                                 '$set': new_article_data,
+                                '$setOnInsert': {
+                                    'createdAt': now,
+                                    'updatedAt': now
+                                }
                             },
                             upsert=True
                         )
@@ -258,8 +262,7 @@ class MongoDBArticleCache:
                 {'platform': platform, 'id': str(article_id)},
                 {
                     '$set': {
-                        'user_info': user_info_list,
-                        'updatedAt': datetime.utcnow()
+                        'user_info': user_info_list
                     }
                 }
             )