Give the backups plugin a settings page, and show where a snapshot is

tests/test_plugins/test_backups.py

@@ -1381,3 +1381,38 @@ def test_buildinfo_kwargs_do_not_disturb_the_live_ntlars_card(bk_app, bk_plugin)
             partmarkertypes=None, revisionid=revision.backuprevisionid,
             sourcehostname=revision.sourcehostname)
         assert 'sectioncount' in card
+
+
+def test_the_card_shows_the_snapshot_path_it_was_actually_written_to(bk_app, bk_plugin):
+    """Plain text, and from the REVISION - not composed from the setting.
+
+    A snapshot written before the share layout changed still lives where it was
+    put, so the stored path is the only honest answer. It is not a link: a
+    browser refuses to navigate from https to file://, so a clickable path
+    would look actionable and do nothing.
+    """
+    from plugins.backups.services import partmarkerinfo
+    from plugins.backups.models import BackupRevision
+
+    with bk_app.app_context():
+        result = bk_plugin.apply_collector_payload({
+            'machinenumber': '3204', 'backupkind': 'partmarker',
+            'contenthash': 'c3' * 32,
+            'sharepath': r'\\host\share\partmarker\3204\20260825-144500',
+            'sourcehostname': 'FBYTNCX3',
+            'manifest': _markermanifest(['A.PAT'])})
+        _db.session.commit()
+        revision = _db.session.get(BackupRevision, result['backuprevisionid'])
+
+        card = partmarkerinfo.build(revision.payload, revision.assetid,
+                                    revisionid=revision.backuprevisionid,
+                                    sharepath=revision.sharepath)
+        snapshot = [f for f in card['fields'] if f['label'] == 'Snapshot']
+        assert snapshot and snapshot[0]['value'] == revision.sharepath
+        assert snapshot[0]['mono'] is True
+
+
+def test_the_card_omits_the_snapshot_row_when_no_path_is_passed(bk_app, bk_plugin):
+    from plugins.backups.services import partmarkerinfo
+    card = partmarkerinfo.build(_markermanifest(['A.PAT']), 1)
+    assert 'Snapshot' not in [f['label'] for f in card['fields']]