Prevent cycles #2
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Delete branch "%!s()"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
There are various recursive relationships in the schema that need to be strictly hierarchical. Right now, that requirement isn't enforced, but it's assumed to be true, meaning that we can get into infinite loops.
It should be the case for rules that the requirement is enforced by the fact that rules can only be created by passing an inductive structure for the clause; thus a tree, thus acyclic.
Entities allow arbitrary re-parenting, so cycle detection is required.