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Joined 1 year ago
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Cake day: June 17th, 2023

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  • Got hands on experience with this. Wasn’t my design choice but I inherited an app with a database where one of the keys was tied to a completely separate database. I mean at the time it probably made sense but the most unlikely of scenarios actually happened: that other database, the one I had zero control over, was migrated to a new platform. All of those keys were synthetic so of course they were like, “Meh, why we gotta keep the old keys?” So post-migration my app becomes basically useless and I spent 6 hours writing migration code, some of it on off hours, to fix my data.

    So it’s questionable whether a foreign key of a completely different system is a natural key, but at the very least never use a key YOU don’t control.