Bottom of /subnets/{id}, admin only.
- Without Force (also drop active leases): API 409 if any lease is still active.
- With Force: leases are removed, then the subnet. DNS deletes go through the outbox (
lease.released).
There is no undo. Prefixes stay. Pools, reservations, excludes, and options on that subnet go with it.
API: DELETE /api/v1/subnets/{id}?force=true.