Abstract: A system includes persistent storage containing an archive, a first interface to a messaging system that includes a plurality of channels, a second interface to a machine learning system that includes a query detection model and a reply detection model, and a processor configured to perform operations including receiving, from the message system, messages that appeared in a particular channel of the plurality of channels. The operations also include providing, to the machine learning system, the messages, where reception of the messages causes the query detection model to detect a query within the messages and the reply detection model to detect, within the messages, replies to the query. The operations further include receiving, from the machine learning system, the query and the replies, and storing, in the archive, the query, the replies, and an indication that the replies relate to the query.