Update app.py

app.py

@@ -519,11 +519,26 @@ async def get_processing_results(session_id: str):
         )
         chunks_metadata = await chunks_cursor.to_list(length=None)
         
-        # Clean up ObjectIds
+        # --- FIX: Convert datetime objects to ISO strings ---
+        # Clean up ObjectIds and datetime objects in chunks
         for chunk in chunks_metadata:
             chunk["_id"] = str(chunk["_id"])
+            if chunk.get("created_at"):
+                chunk["created_at"] = chunk["created_at"].isoformat()
+        
+        # Clean up NER result datetime objects
+        if ner_result:
+            ner_result["_id"] = str(ner_result["_id"])
+            if ner_result.get("created_at"):
+                ner_result["created_at"] = ner_result["created_at"].isoformat()
+        
+        # Clean up summary result datetime objects
+        if summary_result:
+            summary_result["_id"] = str(summary_result["_id"])
+            if summary_result.get("created_at"):
+                summary_result["created_at"] = summary_result["created_at"].isoformat()
             
-        # --- FIX: Convert potential datetime object to an ISO 8601 string ---
+        # Convert session datetime objects
         processing_completed_at = session.get("processing_completed_at")
         if processing_completed_at:
             processing_completed_at = processing_completed_at.isoformat()
@@ -540,7 +555,7 @@ async def get_processing_results(session_id: str):
                     "total_chunks": len(chunks_metadata),
                     "chunks": chunks_metadata[:10]  # Return first 10 chunks metadata
                 },
-                "processing_completed_at": processing_completed_at # Use the converted variable
+                "processing_completed_at": processing_completed_at
             }
         )