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So, if you do not have a final "[]delete" lifepoint, Swarm will keep a UUID forever. You could specify that you want to retain 3 replicas forever until the user deletes the UUID with a single "[]reps=3, deletable=yes" lifepoint.
See the Swarm Guide https://connect.caringo.com/system/files/docs/s/LifepointMetadataHeaders.html Lifepoint Metadata Headers for more information about lifepoints.