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16bbfb582d
The existing-foreign-key dedup compared only columns and other_table, so
requesting an FK that already exists with different ON DELETE/ON UPDATE
actions was a silent no-op - and with add_foreign_key() raising "already
exists", there was no signal that the requested actions were dropped.
An exact match (including actions) is still skipped for idempotency;
a mismatch now raises AlterError pointing at table.transform().
Also validates that compound foreign keys passed as 4-tuples have the
same number of columns on both sides - extra other-columns were being
silently discarded, e.g. ("t", ("a",), "other", ("a", "b")) created a
single-column key referencing just "a".
Refs https://github.com/simonw/sqlite-utils/issues/769#issuecomment-4900034150
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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