Initial SeConectai briefing system

lib/rate-limit.ts

@@ -0,0 +1,23 @@
+type Bucket = {
+  count: number;
+  resetAt: number;
+};
+
+const buckets = new Map<string, Bucket>();
+
+export function checkRateLimit(key: string, limit = 5, windowMs = 15 * 60 * 1000) {
+  const now = Date.now();
+  const bucket = buckets.get(key);
+
+  if (!bucket || bucket.resetAt <= now) {
+    buckets.set(key, { count: 1, resetAt: now + windowMs });
+    return { allowed: true, remaining: limit - 1 };
+  }
+
+  if (bucket.count >= limit) {
+    return { allowed: false, remaining: 0 };
+  }
+
+  bucket.count += 1;
+  return { allowed: true, remaining: limit - bucket.count };
+}