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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2017-02-20T16:07:52Z"
+ content="""
+The assistant re-checks preferred content as rarely as it can get away with,
+since that can be an expensive process. Basically, it checks it when
+starting up, and when a remote is added or edited, and when it detects
+certian kinds of divergences between the local repository and a remote.
+
+I agree that it's not possible to express an expiry using a preferred
+content expression.
+
+What would work better is if you can move the old files to some other
+directory via a cron job or whatever means. Then it's easy to configure it
+not to want files in that directory.
+"""]]