diff --git a/gvsds/apps/stats/tasks.py b/gvsds/apps/stats/tasks.py
index 52206b54..04b9b487 100644
--- a/gvsds/apps/stats/tasks.py
+++ b/gvsds/apps/stats/tasks.py
@@ -12,10 +12,16 @@ from datetime import date, timedelta
 
 from celery import shared_task
 
+from gvsds.celery_utils import RetryOnFailure
+
 logger = logging.getLogger(__name__)
 
+#: PurgeOld 清理的周期类型（daily 每日 / monthly 每月 / hourly 每小时）
+_PURGE_PERIOD_TYPES = ('daily', 'monthly', 'hourly')
+
 
 @shared_task(bind=True, name='stats.ResetDailyStats')
+@RetryOnFailure(max_retries=2, delay=5)
 def ResetDailyStats(self):
     """每日统计清零任务——重置所有租户的 daily 周期数据（默认清零昨天）。
 
@@ -34,6 +40,7 @@ def ResetDailyStats(self):
 
 
 @shared_task(bind=True, name='stats.ResetMonthlyStats')
+@RetryOnFailure(max_retries=2, delay=5)
 def ResetMonthlyStats(self):
     """每月统计清零任务——重置所有租户的 monthly 周期数据（默认清零上月）。
 
@@ -74,6 +81,7 @@ def PurgeOldStats(self, retention_days=90):
 
 
 @shared_task(bind=True, name='stats.BuildDailyRankings')
+@RetryOnFailure(max_retries=2, delay=5)
 def BuildDailyRankings(self):
     """生成每日排行榜——为所有启用排行的指标生成当日排行。
 
diff --git a/gvsds/middleware.py b/gvsds/middleware.py
index 36012039..5d23b3ef 100644
--- a/gvsds/middleware.py
+++ b/gvsds/middleware.py
@@ -1,11 +1,17 @@
 import re
 import uuid
+import time as _time
 import logging
 from gvsds.app_config import getlist as _app_getlist, get as _app_get, getboolean as _app_getbool
 
 logger = logging.getLogger(__name__)
 
 
+def _monotonic():
+    """单调时钟（性能计数，不受系统时间调整影响）"""
+    return _time.monotonic()
+
+
 class DomainMiddleware:
     def __init__(self, get_response):
         self.get_response = get_response
@@ -114,6 +120,8 @@ class AttackDetectMiddleware:
             p.strip() for p in _app_getlist('attack_detect', 'EXEMPT_PATHS', fallback=['/API/Auth', '/health'])
         )
         self.max_body_len = int(_app_get('attack_detect', 'MAX_BODY_LEN', fallback='1024'))
+        #: 攻击日志限频去重表：(ip, attempt_type) -> 最近写入时间（monotonic）
+        self._recent_attacks = {}
 
     def __call__(self, request):
         response = self.get_response(request)
@@ -158,6 +166,16 @@ class AttackDetectMiddleware:
 
             attempt_type = self._classify(response.status_code)
 
+            # 限频去重：同 (IP, 类型) 60s 窗口只记录一次，防攻击者刷 401 反向写库放大
+            now = _monotonic()
+            dedup_key = (request.META.get('REMOTE_ADDR', ''), attempt_type)
+            last_write = self._recent_attacks.get(dedup_key, 0)
+            if now - last_write < 60:
+                return
+            self._recent_attacks[dedup_key] = now
+            if len(self._recent_attacks) > 10000:  # 防内存无界增长
+                self._recent_attacks.clear()
+
             AbnormalUserLog.objects.using('gerpcore').create(
                 LogUUID=uuid.uuid4().bytes,
                 TenantUUID=tenant_uuid,