Add System Health Monitor: RAM/CPU/locks tracking with emergency kill controls + Visual Builder plan

src/pages/api/shim/health.ts

@@ -1,8 +1,9 @@
 // API Route: GET /api/shim/health
-// Returns connection pool stats and database health
+// Returns connection pool stats, database health, and system metrics (RAM/CPU/locks)
 
 import type { APIRoute } from 'astro';
 import { getPoolStats, getDatabaseStats, getVacuumCandidates } from '@/lib/shim/pool';
+import { getSystemHealth } from '@/lib/shim/health';
 
 export const GET: APIRoute = async ({ request }) => {
     try {
@@ -18,21 +19,35 @@ export const GET: APIRoute = async ({ request }) => {
             });
         }
 
-        // Get health stats
+        // Get all health stats
         const poolStats = getPoolStats();
         const dbStats = await getDatabaseStats();
         const vacuumCandidates = await getVacuumCandidates();
+        const systemHealth = await getSystemHealth();
         const needsVacuum = vacuumCandidates.length > 0 && vacuumCandidates[0].deadPercent > 20;
 
+        // Overall status (most critical wins)
+        const overallStatus =
+            systemHealth.status === 'critical' || poolStats.status === 'critical'
+                ? 'critical'
+                : systemHealth.status === 'warning' || poolStats.status === 'warning'
+                    ? 'warning'
+                    : 'healthy';
+
         return new Response(JSON.stringify({
             timestamp: new Date().toISOString(),
+            status: overallStatus,
+            system: systemHealth,
             pool: poolStats,
             database: dbStats,
             vacuum: {
                 recommended: needsVacuum,
                 candidates: vacuumCandidates
             },
-            status: poolStats.status
+            alerts: [
+                ...systemHealth.alerts,
+                ...(poolStats.status !== 'healthy' ? [poolStats.message] : [])
+            ]
         }), {
             status: 200,
             headers: { 'Content-Type': 'application/json' }