dsnap-sync
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snapper method to remove userdata pair
Re. https://github.com/rzerres/dsnap-sync/blob/79fcb07f51dc71da8d47d7df11d7c5cfb90a6150/bin/dsnap-sync#L2373
snapper does it be providing an empty value for the key to be removed, e.g.
snapper -c <CONFIG> modify --userdata "key-to-be-removed=" <NN>