[Chore/Refactor] Use centralized naive_utc_now for UTC datetime operations (#24352)

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/tasks/document_indexing_sync_task.py

@@ -1,4 +1,3 @@
-import datetime
 import logging
 import time
 
@@ -9,6 +8,7 @@ from core.indexing_runner import DocumentIsPausedError, IndexingRunner
 from core.rag.extractor.notion_extractor import NotionExtractor
 from core.rag.index_processor.index_processor_factory import IndexProcessorFactory
 from extensions.ext_database import db
+from libs.datetime_utils import naive_utc_now
 from models.dataset import Dataset, Document, DocumentSegment
 from models.source import DataSourceOauthBinding
 
@@ -72,7 +72,7 @@ def document_indexing_sync_task(dataset_id: str, document_id: str):
         # check the page is updated
         if last_edited_time != page_edited_time:
             document.indexing_status = "parsing"
-            document.processing_started_at = datetime.datetime.now(datetime.UTC).replace(tzinfo=None)
+            document.processing_started_at = naive_utc_now()
             db.session.commit()
 
             # delete all document segment and index