Redis কিভাবে ক্যাশ হিসেবে ব্যবহৃত হয়?

1. App needs data → CHECK Redis first (cache lookup)
2. CACHE HIT (found) → return it immediately (fast!) ✓
3. CACHE MISS (not found) → query the database, store the result in Redis (with TTL),
   then return it. Next time it'll be a hit.

  () {
   cached =  redis.();
   (cached)  .(cached);          

   user =  db..(id);        
   redis.(, .(user), , );  
   user;
}