Refactor: Optimize user role fetching

src/lib/queryKeys.ts

@@ -0,0 +1,18 @@
+/**
+ * Centralized query key definitions for TanStack Query
+ * 
+ * This ensures consistent query keys across the application
+ * and makes cache invalidation easier to manage.
+ */
+
+export const queryKeys = {
+  // User-related queries
+  userRoles: (userId?: string) => ['user-roles', userId] as const,
+  userPermissions: (userId?: string) => ['user-permissions', userId] as const,
+  
+  // Moderation queue queries
+  moderationQueue: (config: Record<string, any>) => ['moderation-queue', config] as const,
+  moderationStats: () => ['moderation-stats'] as const,
+  
+  // Add more query keys as needed
+} as const;