add prune mbid cli doc NOCHANGELOG

docs/administrator/manage-script/mbid_prune.md

@@ -0,0 +1,40 @@
+# Delete funkwhale objects that don't have a Musicbrainz id
+
+If you enable the option to [only allow MusicBrainz content](../configuration/instance-settings.md) on your pod after you've uploaded content,you can to use this command to prune content that doesn't have a MusicBrainz ID to make your database more consistent.
+
+```{warning}
+This action **does not** send a notification to your users before content is removed. You may want to warm them before.
+```
+
+```{warning}
+Running `prune_non_mbid_content` with the `--no-dry-run` flag is irreversible. Make sure you [back up your data](../upgrade/backup.md).
+```
+
+::::{tab-set}
+
+:::{tab-item} Debian
+:sync: debian
+
+```{code-block} sh
+venv/bin/funkwhale-manage prune_non_mbid_content
+```
+
+:::
+
+:::{tab-item} Docker
+:sync: docker
+
+```{code-block} sh
+sudo docker compose run --rm api funkwhale-manage prune_non_mbid_content
+```
+
+:::
+::::
+
+```{note}
+The command excludes tracks that are in users' favorites, playlists, and listen history. To include these tracks, add the corresponding flags:
+
+- `--include-favorites-content`
+- `--include-listened-content`
+- `--include-playlist-content`
+```