@geraldodev, sorry i missed your comment: > About processing facts that comes from sql databases on long running sessions. Because of mutation, one has to query the session looking for the fact based on the primary key of the table, compare it with the current value and if it’s different retract the old fact and insert again. Is that correct ? I think that makes sense, for changes outside of the session, you would have to manually update the fact inside the session via an external retract followed by insertion of the fact.