fix(web): resolve healthz cache warning by using lightweight count query

The getCachedAgentsLite function was trying to cache ~19MB of agent data,
exceeding the unstable_cache 2MB limit. Created a new getAgentCount()
function that only performs a COUNT(*) query, avoiding the cache entirely.

This fixes the warning: "Failed to set Next.js data cache for unstable_cache
/api/healthz, items over 2MB can not be cached"

Author: brandonkachen

web/src/app/api/healthz/route.ts

@@ -1,24 +1,24 @@
 import { NextResponse } from 'next/server'
-import { getCachedAgentsLite } from '@/server/agents-data'
+import { getAgentCount } from '@/server/agents-data'
 
 export const GET = async () => {
   try {
-    // Warm the cache by fetching agents data
-    // This ensures SEO-critical data is available immediately
-    const agents = await getCachedAgentsLite()
+    // Get a lightweight count of agents without caching the full data
+    // This avoids the unstable_cache 2MB limit warning
+    const agentCount = await getAgentCount()
 
     return NextResponse.json({
       status: 'ok',
-      cached_agents: agents.length,
+      cached_agents: agentCount,
       timestamp: new Date().toISOString(),
     })
   } catch (error) {
-    console.error('[Healthz] Failed to warm cache:', error)
+    console.error('[Healthz] Failed to get agent count:', error)
 
-    // Still return 200 so health check passes, but indicate cache warming failed
+    // Still return 200 so health check passes, but indicate the error
     return NextResponse.json({
       status: 'ok',
-      cache_warm: false,
+      agent_count_error: true,
       error: error instanceof Error ? error.message : 'Unknown error',
     })
   }

web/src/server/agents-data.ts

@@ -455,3 +455,17 @@ export const getCachedAgentsMetrics = unstable_cache(
     tags: ['agents', 'metrics'],
   },
 )
+
+// ============================================================================
+// LIGHTWEIGHT COUNT - For healthz endpoint, avoids unstable_cache 2MB limit
+// ============================================================================
+
+export const getAgentCount = async (): Promise<number> => {
+  const result = await db
+    .select({
+      count: sql<number>`COUNT(*)`,
+    })
+    .from(schema.agentConfig)
+
+  return Number(result[0]?.count ?? 0)
+}