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In cases where the data itself doesn't carry the unit (or TZ in this case), I usually ask that the unit-less columns at least include the unit in the name. A TZ-less column is not that bad if it is suffixed "UTC", e.g. `ExecutionTimeUtc`.

There are probably real world cases where dropping the TZ/offset provides meaningful performance/storage savings, but it hasn't been the typical case in my current sector.

They must yearn for the before times when text could be in an encoding specified only as: "your guess is as good mine!"

> Every user has to guess, or be informed, that they’re UTC.

At least they are UTC and not EST or PST...