docs: add the --keep-unique option in the documentation

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Srigovind Nayak 2025-04-19 20:42:43 +05:30
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@ -202,6 +202,7 @@ The ``forget`` command accepts the following policy options:
specified duration of the latest snapshot.
- ``--keep-within-yearly duration`` keep all yearly snapshots made within the
specified duration of the latest snapshot.
- ``--keep-unique`` keep only one snapshot per tree.
.. note:: All calendar related options (``--keep-{hourly,daily,...}``) work on
natural time boundaries and *not* relative to when you run ``forget``. Weeks