add two prs

Author: valentijnscholten

docs/content/en/open_source/upgrading/2.51.md

@@ -11,7 +11,9 @@ This release includes multiple improvements aimed at making DefectDojo faster, m
 
 - Import and reimport are significantly more efficient: product grading is now orchestrated in batches using Celery chords, reducing the number of background tasks and database churn during large scans. This means faster imports and smoother post-processing on busy systems. See [PR 12914](https://github.com/DefectDojo/django-DefectDojo/pull/12914).
 - Query-count reductions and importer hot-path tuning: we trimmed unnecessary ORM calls and optimized how findings/endpoints are updated during (re)import. You should see noticeably quicker runs out of the box. See [PR 13182](https://github.com/DefectDojo/django-DefectDojo/pull/13182) and [PR 13152](https://github.com/DefectDojo/django-DefectDojo/pull/13152).
-- Smarter background task orchestration and general cleanup: less duplicate work and better scheduling during heavy operations, keeping the UI responsive while long jobs run. See [PR 12900](https://github.com/DefectDojo/django-DefectDojo/pull/12900).
+- Smarter background task orchestration for product graing: less duplicate work and better scheduling during heavy operations, keeping the UI responsive while long jobs run. See [PR 12900](https://github.com/DefectDojo/django-DefectDojo/pull/12900).
+- Bulk tag addition for large batches: adds an internal method to add tags to many findings at once, performing tagging in batches (default 1,000) with only a few queries per batch. This replaces ~3 queries per finding with ~3 queries per batch, significantly reducing DB load during imports, reimports, and bulk edit. On a ~10k-findings sample, import time dropped from ~372s to ~190s. See [PR 13285](https://github.com/DefectDojo/django-DefectDojo/pull/13285).
+- Preparations for our switch to `django-pghistory` which provides more features and better performance compared to `django-auditlog`. See [PR 13169](https://github.com/DefectDojo/django-DefectDojo/pull/13169).
 
 No configuration changes are required—gains are automatic after upgrading.