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It is useful to have stable and unique identifiers for a security principal. The majority of identitiy management systems in use with Unix systems today (e.g. Active Directory objectGUID, FreeIPA ipaUniqueID, Kanidm UUIDs) assign each account and group a unique UUID and exposing that to applications allows them to refer to accounts in a stable manner. At this time we are merely adding the properties to the user/group records. Adding ways to perform lookups by these IDs is left for a future PR. See [discussion](https://mastodon.social/@pid_eins/114283987142625086) and [this comment](https://github.com/systemd/systemd/issues/24032#issuecomment-2745246757). I'm sure there are wording aspects which could be improved, but I believe this is a reasonable initial stab at the problem.