for moment in key_moments_json:

moment.pop('images', None)
moment.pop('end', None)
moment.pop('transcript', None)

app.py

@@ -2143,6 +2143,8 @@ def streaming_chat_with_open_ai(user_message, chat_history, password, video_id,
         # key_moments_json remove images
         for moment in key_moments_json:
             moment.pop('images', None)
+            moment.pop('end', None)
+            moment.pop('transcript', None)
         key_moments_text = json.dumps(key_moments_json, ensure_ascii=False)
 
         instructions = get_instructions(content_subject, content_grade, key_moments_text)