feat: monitoring + logging with sentry and pino

src/routes/api/debug/metrics/+server.ts

@@ -0,0 +1,33 @@
+import { json, error } from '@sveltejs/kit';
+import { dev } from '$app/environment';
+import { metrics } from '$lib/server/metrics';
+import type { RequestHandler } from './$types';
+
+export const GET: RequestHandler = async ({ locals }) => {
+	// In production, require admin role
+	if (!dev) {
+		if (!locals.user || locals.user.role !== 'admin') {
+			throw error(403, 'Forbidden');
+		}
+	}
+
+	return json({
+		uptime: Math.round(process.uptime()),
+		startedAt: new Date(metrics.startedAt).toISOString(),
+		requests: {
+			total: metrics.requestCount,
+			avgResponseMs: metrics.avgResponseTime,
+			slowRequests: metrics.slowRequests
+		},
+		database: {
+			totalQueries: metrics.totalQueries,
+			slowQueries: metrics.slowQueries,
+			avgQueryMs: metrics.avgQueryTime
+		},
+		memory: {
+			heapUsedMB: Math.round(process.memoryUsage().heapUsed / 1024 / 1024),
+			heapTotalMB: Math.round(process.memoryUsage().heapTotal / 1024 / 1024),
+			rssMB: Math.round(process.memoryUsage().rss / 1024 / 1024)
+		}
+	});
+};