Deactivate a sequence: automatic dispatch skips it, and it can no longer be started on a tour. It keeps its rank, so activating it puts it back in its place in the dispatch order. Nothing else is checked, so a sequence the rules of POST /sequences refuse now (a carrier or brick deleted since) can always be switched off. Deactivating an inactive sequence changes nothing and keeps its version; otherwise version advances. The response is the stored sequence, with its summary.