feat: Deprecate datetime.utcnow() in favor of datetime.now(timezone.utc).replace(tzinfo=None) for better timezone handling (#3408) (#3416)

api/events/event_handlers/create_document_index.py

@@ -29,7 +29,7 @@ def handle(sender, **kwargs):
             raise NotFound('Document not found')
 
         document.indexing_status = 'parsing'
-        document.processing_started_at = datetime.datetime.utcnow()
+        document.processing_started_at = datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None)
         documents.append(document)
         db.session.add(document)
     db.session.commit()