Deleting a relationship is soft, so the row survives with isactive False, and
three things read them without knowing that.
Re-adding a deleted link answered 409 "this relationship already exists" about a
link the page no longer shows, and there was no way forward from the UI at all -
the row cannot simply be inserted again, since the triple is unique.
Reactivating IS the create for an inactive row.
The inverse guard blocked on a deleted inverse, which made "remove the existing
one first" - the instruction in its own message - fail to unblock anything.
fix-controls-direction retired the reversed row whenever a correctly-directed
one existed, without checking whether that one was itself deleted. So it removed
the only live link and reported a successful clean-up. It now reactivates the
row pointing the right way before retiring the one pointing the wrong way.
These are the commands the docs tell an operator to run against production.
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