Implement KB sync after Notion page updates with block ID verification

- Add NotionKBSyncService for immediate KB updates after page changes
- Implement block ID verification to ensure content freshness
- Refactor duplicate block processing logic to shared utils
- Add user-friendly status messages
- Include debug logging for troubleshooting

surfsense_backend/app/services/notion/kb_sync_service.py

@@ -26,6 +26,7 @@ class NotionKBSyncService:
         appended_content: str,
         user_id: str,
         search_space_id: int,
+        appended_block_ids: list[str] | None = None,
     ) -> dict:
         from app.tasks.connector_indexers.base import (
             get_current_timestamp,
@@ -33,13 +34,70 @@ class NotionKBSyncService:
         )
 
         try:
+            logger.debug(f"Starting KB sync for document {document_id}")
             document = await self.db_session.get(Document, document_id)
 
             if not document:
+                logger.warning(f"Document {document_id} not found in KB")
                 return {"status": "not_indexed"}
 
-            new_content = document.content + "\n\n" + appended_content
+            page_id = document.document_metadata.get("page_id")
+            if not page_id:
+                logger.error(f"Document {document_id} missing page_id in metadata")
+                return {"status": "error", "message": "Missing page_id in metadata"}
 
+            logger.debug(
+                f"Document found: id={document_id}, page_id={page_id}, connector_id={document.connector_id}"
+            )
+
+            from app.connectors.notion_history import NotionHistoryConnector
+
+            notion_connector = NotionHistoryConnector(
+                session=self.db_session, connector_id=document.connector_id
+            )
+
+            logger.debug(f"Fetching page content from Notion for page {page_id}")
+            blocks, _ = await notion_connector.get_page_content(page_id, page_title=None)
+
+            from app.utils.notion_utils import extract_all_block_ids, process_blocks
+
+            fetched_content = process_blocks(blocks)
+            logger.debug(f"Fetched content length: {len(fetched_content)} chars")
+
+            content_verified = False
+            if appended_block_ids:
+                fetched_block_ids = set(extract_all_block_ids(blocks))
+                found_blocks = [
+                    bid for bid in appended_block_ids if bid in fetched_block_ids
+                ]
+
+                logger.debug(
+                    f"Block verification: {len(found_blocks)}/{len(appended_block_ids)} blocks found"
+                )
+                logger.debug(
+                    f"Appended IDs (first 3): {appended_block_ids[:3]}, Fetched IDs count: {len(fetched_block_ids)}"
+                )
+
+                if len(found_blocks) >= 1:
+                    logger.info(
+                        f"Content verified fresh: found {len(found_blocks)} appended blocks"
+                    )
+                    full_content = fetched_content
+                    content_verified = True
+                else:
+                    logger.warning(
+                        "No appended blocks found in fetched content - appending manually"
+                    )
+                    full_content = fetched_content + "\n\n" + appended_content
+                    content_verified = False
+            else:
+                logger.warning("No block IDs provided - using fetched content as-is")
+                full_content = fetched_content
+                content_verified = False
+
+            logger.debug(f"Final content length: {len(full_content)} chars, verified={content_verified}")
+
+            logger.debug("Generating summary and embeddings")
             user_llm = await get_user_long_context_llm(
                 self.db_session, user_id, search_space_id
             )
@@ -52,22 +110,28 @@ class NotionKBSyncService:
                     "connector_type": "Notion",
                 }
                 summary_content, summary_embedding = await generate_document_summary(
-                    new_content, user_llm, document_metadata_for_summary
+                    full_content, user_llm, document_metadata_for_summary
                 )
+                logger.debug(f"Generated summary length: {len(summary_content)} chars")
             else:
-                summary_content = f"Notion Page: {document.document_metadata.get('page_title')}\n\n{new_content[:500]}..."
+                logger.warning("No LLM configured - using fallback summary")
+                summary_content = f"Notion Page: {document.document_metadata.get('page_title')}\n\n{full_content[:500]}..."
                 summary_embedding = config.embedding_model_instance.embed(
                     summary_content
                 )
 
+            logger.debug(f"Deleting old chunks for document {document_id}")
             await self.db_session.execute(
                 delete(Chunk).where(Chunk.document_id == document.id)
             )
 
-            chunks = await create_document_chunks(new_content)
+            logger.debug("Creating new chunks")
+            chunks = await create_document_chunks(full_content)
+            logger.debug(f"Created {len(chunks)} chunks")
 
+            logger.debug("Updating document fields")
             document.content = summary_content
-            document.content_hash = generate_content_hash(new_content)
+            document.content_hash = generate_content_hash(full_content, search_space_id)
             document.embedding = summary_embedding
             document.document_metadata = {
                 **document.document_metadata,
@@ -76,9 +140,14 @@ class NotionKBSyncService:
             safe_set_chunks(document, chunks)
             document.updated_at = get_current_timestamp()
 
+            logger.debug("Committing changes to database")
             await self.db_session.commit()
 
-            logger.info(f"Successfully synced KB for document {document_id}")
+            logger.info(
+                f"Successfully synced KB for document {document_id}: "
+                f"summary={len(summary_content)} chars, chunks={len(chunks)}, "
+                f"content_verified={content_verified}"
+            )
             return {"status": "success"}
 
         except Exception as e: