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Currently, promotions cannot be destroyed as soon as the have dependent records. This sets
dependent: :destroy
on all important relations except foractions
, which are soft-deletable, and thus need to be nullified instead.Alternatively, we could make all tables soft-deleteable, which would be better for auditing. If a promotion gets applied, and we have an adjustment with a promotion action as its source, and then we delete the promotion action's promotion, we will end up with an "orphan" promotion action.
Promotion actions need to be soft-deleteable, because if they are deleted, they might nullify - or worse - delete adjustments on orders.