Self-expiring public artifacts (data-artifact-expires + launchd)
Pages you publish can carry an expiry date and quietly take themselves down when it passes.
how it works
data-artifact-expires="YYYY-MM-DD" attribute + daily 03:00 launchd job (com.artifacts.expire) that removes expired files and regenerates the index with a ~50 ms bash/grep/sed script.
Technique: A pattern or hard-won lesson, written down so it isn't learned twice.