PostGres description of their UPSERT implementation is a nice history lesson of what I though was every database's core feature and left me stunned about how hard it is to get ON CONFLICT right. wiki.postgresql.org/wiki/UPSERT
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As the primary author of the Postgres UPSERT implementation, and of the wall of text you linked to, it's gratifying to see this acknowledged
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Even though you publish under a weird license, I still might owe you a beer ;)