diff --git a/apps/web/src/components/reui-kit/service-health-monitor.tsx b/apps/web/src/components/reui-kit/service-health-monitor.tsx
index abc2079..e3a6c5e 100644
--- a/apps/web/src/components/reui-kit/service-health-monitor.tsx
+++ b/apps/web/src/components/reui-kit/service-health-monitor.tsx
@@ -30,9 +30,8 @@ import {
 import { cn } from '@cfdm/ui/lib/utils'
 import type { HealthCheckProvider } from '@cfdm/shared'
 
-type SourceTab = 'all' | HealthCheckProvider
-
-const ALL_TAB: SourceTab = 'all'
+const ALL_TAB = 'all' as const
+type SourceTab = typeof ALL_TAB | HealthCheckProvider
 
 function formatUptime(value: number | null): string {
   if (value == null) return '—'
@@ -83,7 +82,7 @@ export function ServiceHealthMonitor({
     [enabledProviders],
   )
 
-  const selectedProviders = useMemo<HealthCheckProvider[]>(() => {
+  const selectedProviders = useMemo((): HealthCheckProvider[] => {
     if (source === ALL_TAB) return [...enabledProviders]
     if (enabledProviders.includes(source)) return [source]
     return [...enabledProviders]