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Edit Admin
I half-suspect that's auto-generated code. The rule says "When connecting two tables, make sure there's a FK constraint between them so there can't be orphan records". So when the dumb SQL generator code was told to connect table A to table A, it mindlessly added the appropriate FK constraint.
But where's the fun in that? Better to think it was a clueless self-taught noob. Or more likely somebody who took, passed, but understood none of, Databases 201.