diff --git a/app/cache/tiered_cache.py b/app/cache/tiered_cache.py
index e0a0627..39fa13e 100644
--- a/app/cache/tiered_cache.py
+++ b/app/cache/tiered_cache.py
@@ -36,7 +36,7 @@ class TieredCache(BaselineCache):
             path = f"tiered_cache/{k}"
             self.l2_map[k] = path
             f = open(path, "w+")
-            f.write(v)
+            f.write(str(v))
             f.close()
             
         self.cache[key] = val
diff --git a/app/database.py b/app/database.py
index 9baf5ab..132d85a 100644
--- a/app/database.py
+++ b/app/database.py
@@ -8,6 +8,9 @@ DB_LOCATION = "database/datastore/" + DB_FILE
 db = TinyDB(DB_LOCATION)
 User = Query()
 
+def get_user_ids():
+    return [x["user_id"] for x in db.all()]
+
 def get_user_profile(user_id):
     """Fetch user profile from TinyDB"""
     result = db.search(User.user_id == user_id)
diff --git a/app/main.py b/app/main.py
index afcc544..6e8db33 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,5 +1,5 @@
 from fastapi import FastAPI, HTTPException
-from database import get_user_profile, update_user_profile
+from database import get_user_ids, get_user_profile, update_user_profile
 from cache.cache import BaselineCache
 from cache.prefetch_cache import PrefetchCache
 from cache.tiered_cache import TieredCache
@@ -21,6 +21,10 @@ elif CACHE_STRATEGY == "Seive":
 else:
     raise ValueError(f"Invalid CACHE_STRATEGY: {CACHE_STRATEGY}")
 
+@app.get("/users")
+def fetch_user_ids():
+    return {"ids": get_user_ids()}
+
 @app.get("/user/{user_id}")
 def fetch_user_profile(user_id: str):
     """Fetch user profile with caching"""
diff --git a/tests/basic_latency_hitrate.py b/tests/basic_latency_hitrate.py
index e8e1e31..4530d79 100644
--- a/tests/basic_latency_hitrate.py
+++ b/tests/basic_latency_hitrate.py
@@ -10,10 +10,14 @@ endpoints = {
     "/user/{user_id}": 1
 }
 
+user_ids = json.loads(requests.get(baseurl + "/users").content)["ids"]
+
+random.seed(0)
+
 def generate_random():
     x = random.choices(list(endpoints.keys()), list(endpoints.values()))[0] # select randomly from endpoint (keys) with weight (values)
 
-    random_user = str(random.randint(1, 3))
+    random_user = str(random.choice(user_ids))
     x = x.replace("{user_id}", random_user)
 
     return baseurl + x