Aging circulations
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Every time you attempt to `DELETE` a row from `action.circ`, it
copies over the appropriate data to `action.aged_circulation`,
then deletes the `action.circ` row.

.Use case
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Aging circulations helps to protect patron privacy and save disk space.

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[TIP]
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Just aging circulations is not sufficient to protect patron circulation
history.  Fully protecting these data would also involve a thoughtful
approach to logs and backups of these data.
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[TIP]
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You can create a cron job to automatically age circulations.
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