diff --git a/axes/handlers/database.py b/axes/handlers/database.py
index 64f63576..5852ab4c 100644
--- a/axes/handlers/database.py
+++ b/axes/handlers/database.py
@@ -1,6 +1,7 @@
 from logging import getLogger
-from typing import List, Optional
+from typing import List, Optional, Type, TypeVar
 
+from django.contrib.auth.base_user import AbstractBaseUser
 from django.db import router, transaction
 from django.db.models import F, Q, QuerySet, Sum, Value
 from django.db.models.functions import Concat
@@ -23,6 +24,8 @@
 from axes.models import AccessAttempt, AccessFailureLog, AccessLog
 from axes.signals import user_locked_out
 
+UserModel = TypeVar("UserModel", bound=AbstractBaseUser)
+
 log = getLogger(__name__)
 
 
@@ -114,7 +117,7 @@ def get_failures(self, request, credentials: Optional[dict] = None) -> int:
         )
         return attempt_count
 
-    def user_login_failed(self, sender, credentials: dict, request=None, **kwargs):
+    def user_login_failed(self, sender: str, credentials: dict, request: Optional[HttpRequest] = None, **kwargs):
         """
         When user login fails, save AccessFailureLog record in database,
         save AccessAttempt record in database, mark request with
@@ -254,7 +257,7 @@ def user_login_failed(self, sender, credentials: dict, request=None, **kwargs):
                 )
                 self.remove_out_of_limit_failure_logs(username=username)
 
-    def user_logged_in(self, sender, request, user, **kwargs):
+    def user_logged_in(self, sender: Type[UserModel], request: HttpRequest, user: UserModel, **kwargs):
         """
         When user logs in, update the AccessLog related to the user.
         """
@@ -297,7 +300,9 @@ def user_logged_in(self, sender, request, user, **kwargs):
                 client_str,
             )
 
-    def user_logged_out(self, sender, request, user, **kwargs):
+    def user_logged_out(
+        self, sender: Optional[Type[UserModel]], request: HttpRequest, user: Optional[UserModel], **kwargs
+    ):
         """
         When user logs out, update the AccessLog related to the user.
         """
@@ -370,7 +375,7 @@ def get_user_attempts(
         ]
 
     def clean_expired_user_attempts(
-        self, request: Optional[HttpRequest] = None, credentials: Optional[dict] = None
+        self, request: HttpRequest, credentials: Optional[dict] = None
     ) -> int:
         """
         Clean expired user attempts from the database.
@@ -382,8 +387,9 @@ def clean_expired_user_attempts(
             )
             return 0
 
+        username = get_client_username(request, credentials)
         threshold = get_cool_off_threshold(request)
-        count, _ = AccessAttempt.objects.filter(attempt_time__lt=threshold).delete()
+        count, _ = AccessAttempt.objects.filter(username=username, attempt_time__lt=threshold).delete()
         log.info(
             "AXES: Cleaned up %s expired access attempts from database that were older than %s",
             count,