Troy wrote:
At least one time a year (in my timezone) the clock is turned back one hour and it would be possible to overwrite existing keys during that hour.
For those who deal with daylight savings on unix, in the fall when clocks roll back, the clock hits 3:00am and then rolls back to 2:00am. As Troy points out, this causes that one-hour period to occur twice, possibly leading to issues with duplication.
For this same reason, we never schedule any cron jobs between 2am and 3am as they would run twice.
Conversely, in the spring when time rolls forward, the clock hits 2am and immediately jumps to 3am, thereby skipping any processing (eg: cron) that might've occured between 2am and 3am.
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