add time stamp (in ms) to get response

app/main.py

@@ -4,6 +4,7 @@ from cache.cache import BaselineCache
 from cache.prefetch_cache import PrefetchCache
 from cache.tiered_cache import TieredCache
 from config import CACHE_STRATEGY, CACHE_LIMIT, L2_CACHE_LIMIT
+import time
 
 app = FastAPI()
 
@@ -20,16 +21,17 @@ else:
 @app.get("/user/{user_id}")
 def fetch_user_profile(user_id: str):
     """Fetch user profile with caching"""
+    start = time.time()
     cached_profile = cache.get(user_id)
     if cached_profile:
-        return {"user_id": user_id, "profile": cached_profile, "source": "cache"}
+        return {"user_id": user_id, "profile": cached_profile, "source": "cache", "time_ms": (time.time() - start) * 1000}
 
     profile = get_user_profile(user_id)
     if profile is None:
         raise HTTPException(status_code=404, detail="User not found")
 
     cache.put(user_id, profile)  # Store in cache
-    return {"user_id": user_id, "profile": profile, "source": "database"}
+    return {"user_id": user_id, "profile": profile, "source": "database", "time_ms": (time.time() - start) * 1000}
 
 @app.post("/update_user/")
 def modify_user_profile(user_id: str, name: str, followers: int, bio: str, posts: str):