it is useless to keep history of claims updates

src/api.rs

@@ -225,7 +225,7 @@ pub fn execute(
                 for item in new_claims.difference(&current_claims) {
                     response.push_update(db::Claims(conn).add(id, *item)?);
                 }
-                Ok(Some((id, "Requête(s) mises(s) à jour")))
+                Ok(None)
             })?
         }
         ApiActions::UndoLastAction(id) => {