Transaction Rollback

Use thenUnsafe(...) when the transaction boundary depends on exceptions bubbling out of the chain.

php

DB::transaction(function () use ($dto) {
    return Result::ok($dto)
        ->thenUnsafe(new ValidateOrderAction)
        ->thenUnsafe(new PersistOrderAction)
        ->throwIfFail();
});

Why this pattern works

thenUnsafe(...) does not convert thrown exceptions into failures
the transaction can roll back naturally
throwIfFail() escalates explicit failure results at the edge