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import { createClient } from 'redis'; const client = createClient({ url: process.env.REDIS_URL }); await client.connect(); // Sliding window rate limiter async function rateLimit(userId: string, limit = 100, windowSec = 60) { const key = `rate:${userId}:${Math.floor(Date.now() / 1000 / windowSec)}`; const count = await client.incr(key); if (count === 1) await client.expire(key, windowSec); return count <= limit; } // Cache-aside pattern async function getUser(id: string) { const cached = await client.get(`user:${id}`); if (cached) return JSON.parse(cached); const user = await db.users.findById(id); await client.setEx(`user:${id}`, 300, JSON.stringify(user)); return user; }