perf: optimize password change log filtering by organization

apps/audits/models.py

@@ -6,7 +6,8 @@ from importlib import import_module
 from django.conf import settings
 from django.core.cache import caches
 from django.db import models
-from django.db.models import Q
+from django.db.models import Q, CharField, F, Value
+from django.db.models.functions import Cast, Coalesce, Concat
 from django.utils import timezone
 from django.utils.translation import gettext, gettext_lazy as _
 
@@ -181,6 +182,16 @@ class ActivityLog(OrgModelMixin):
         return super(ActivityLog, self).save(*args, **kwargs)
 
 
+def user_display_expression():
+    return Concat(
+        Coalesce(Cast(F('name'), CharField()), Value('None')),
+        Value('('),
+        Coalesce(Cast(F('username'), CharField()), Value('None')),
+        Value(')'),
+        output_field=CharField(),
+    )
+
+
 class PasswordChangeLog(models.Model):
     id = models.UUIDField(default=uuid.uuid4, primary_key=True)
     user = models.CharField(max_length=128, verbose_name=_("User"))
@@ -199,7 +210,11 @@ class PasswordChangeLog(models.Model):
     @staticmethod
     def filter_queryset_by_org(queryset):
         if not current_org.is_root():
-            users = current_org.get_members()
+            users = (
+                current_org.get_members()
+                .annotate(user_display=user_display_expression())
+                .values_list('user_display', flat=True)
+            )
             queryset = queryset.filter(
                 user__in=[str(user) for user in users]
             )