Fixed #36217 -- Restored pre_save/post_save signal emission via LogEntry.save() for single-object deletion in the admin.

Regression in 40b3975e7d.

Thanks smiling-watermelon for the report.

Co-authored-by: Sarah Boyce <42296566+sarahboyce@users.noreply.github.com>

docs/releases/5.1.7.txt

@@ -22,3 +22,7 @@ Bugfixes
   of ``ManyToManyField`` related managers would always return ``0`` and
   ``False`` when the intermediary model back references used ``to_field``
   (:ticket:`36197`).
+
+* Fixed a regression in Django 5.1 where the ``pre_save`` and ``post_save``
+  signals for ``LogEntry`` were not sent when deleting a single object in the
+  admin (:ticket:`36217`).

docs/releases/5.1.txt

@@ -401,6 +401,11 @@ Miscellaneous
 * The minimum supported version of ``asgiref`` is increased from 3.7.0 to
   3.8.1.
 
+* To improve performance, the ``delete_selected`` admin action now uses
+  ``QuerySet.bulk_create()`` when creating multiple ``LogEntry`` objects. As a
+  result, ``pre_save`` and ``post_save`` signals for ``LogEntry`` are not sent
+  when multiple objects are deleted via this admin action.
+
 .. _deprecated-features-5.1:
 
 Features deprecated in 5.1