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@ -22,7 +22,7 @@ create index if not exists IndexReference on Refs(reference);
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-- ValidPaths to cause a foreign key constraint violation (due to `on
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-- delete restrict' on the `reference' column). Therefore, explicitly
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-- get rid of self-references.
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create trigger DeleteSelfRefs before delete on ValidPaths
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create trigger if not exists DeleteSelfRefs before delete on ValidPaths
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begin
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delete from Refs where referrer = old.id and reference = old.id;
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end;
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