fix(tests): the notes table has 27 columns — deleted_batch_id is the second deliberate exclusion (#3165)

The pin test caught its own inaccuracy on the first run, which is what it is
for. `deleted_batch_id` comes from SoftDeleteMixin alongside `deleted_at` and
is excluded for the same reason: trashed rows are not exported, so neither is
the batch id that groups them for restore(). The nine-field gap #3182 tracks
is unchanged.

tests/test_services_backup.py

@@ -67,7 +67,7 @@ def test_a_never_checked_note_exports_a_null_stamp_and_restores_as_one():
 
 
 def test_the_note_section_gap_is_pinned_rather_than_silent():
-    """#3182. `_note_rows` carries 16 of the `notes` table's 26 columns, and the
+    """#3182. `_note_rows` carries 16 of the `notes` table's 27 columns, and the
     absences are not harmless: without `note_type` every snippet and process
     restores as a plain note, and without `task_kind` every issue and spike
     restores as `work`.
@@ -86,8 +86,9 @@ def test_the_note_section_gap_is_pinned_rather_than_silent():
     missing = {c.name for c in Note.__table__.columns} - carried
 
     assert missing == {
-        # Deliberate: trashed rows are not exported.
-        "deleted_at",
+        # Deliberate: trashed rows are not exported, so neither is the batch
+        # id that groups them for restore().
+        "deleted_at", "deleted_batch_id",
         # NOT deliberate — the #3182 gap, in the order they hurt.
         "note_type",       # snippets and processes flatten into notes
         "task_kind",       # issues and spikes flatten into work