优化系统健康评分与缓存监测

backend/app/services/permission_metric_aggregator.py

@@ -40,7 +40,7 @@ async def _aggregate_hour(bucket_start: datetime, bucket_end: datetime) -> None:
 
         from app.core.permission_monitor import get_permission_monitor
         monitor = get_permission_monitor()
-        cache_metrics = monitor.metrics.cache_metrics
+        cache_metrics = monitor.metrics.cache_metrics.window_stats(3600)
 
         snapshot = PermissionMetricSnapshot(
             id=uuid.uuid4(),
@@ -50,8 +50,8 @@ async def _aggregate_hour(bucket_start: datetime, bucket_end: datetime) -> None:
             denied_checks=row.denied,
             avg_elapsed_ms=float(row.avg_ms),
             max_elapsed_ms=float(row.max_ms),
-            cache_hits=cache_metrics.cache_hits,
-            cache_misses=cache_metrics.cache_misses,
+            cache_hits=cache_metrics["cache_hits"],
+            cache_misses=cache_metrics["cache_misses"],
             error_count=0,
         )
         session.add(snapshot)