优化系统健康评分与缓存监测

backend/app/core/permission_cache.py

@@ -44,8 +44,12 @@ class PermissionCache:
         if cache_key in self._member_role_cache:
             cached_role, timestamp = self._member_role_cache[cache_key]
             if not self._is_expired(timestamp, ttl):
+                from app.core.permission_monitor import get_permission_monitor
+                get_permission_monitor().record_cache_hit("member_roles")
                 return cached_role
 
+        from app.core.permission_monitor import get_permission_monitor
+        get_permission_monitor().record_cache_miss("member_roles")
         membership = await member_crud.get_member(db, study_id, user_id)
         role = membership.role_in_study if membership and membership.is_active else None
 
@@ -102,6 +106,17 @@ class PermissionCache:
         self._member_role_cache.clear()
 
     def get_cache_stats(self) -> dict[str, Any]:
+        now = time.time()
+        self._project_permissions_cache = {
+            key: value
+            for key, value in self._project_permissions_cache.items()
+            if now - value[1] <= self.default_ttl
+        }
+        self._member_role_cache = {
+            key: value
+            for key, value in self._member_role_cache.items()
+            if now - value[1] <= self.default_ttl
+        }
         return {
             "project_permissions_count": len(self._project_permissions_cache),
             "member_role_count": len(self._member_role_cache),