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I was more thinking "when will we be able to UPSERT individual values in a json field" BTW, with an expression unique index you *can* upsert individual values in a JSON field. #next not concurrently with somebody else upserting a different value in the same JSON field. #yourenotdoneyet Why not? Once you lock the row with the value proposed for insertion, expression unique index inserters block on your xact.