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Generating a waybill raises exception. It is Friday night and everyone else is already at the bar. Drop the unique constraint and call it day.

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Ok but still: as a user, how do you even know that there are two containers with the same id? In other words, a human needs to have way of telling them apart.

Even if two entries showed up with the same id, I’d assume as a user it’s a glitch and would not put two different shipments into what I would assume is a duplicate entry for the same container.

I'd assume the containers were labeled at different ports and by chance got sent to the same port. So the persons looking at the containers only had one to worry about. And with both going to the same destination one person probably shrugged when they saw the origin port was somewhere else.

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