diff --git a/backend-python/routes/state_cache.py b/backend-python/routes/state_cache.py
index e7ce015..c58cf08 100644
--- a/backend-python/routes/state_cache.py
+++ b/backend-python/routes/state_cache.py
@@ -4,12 +4,16 @@ from fastapi import APIRouter, HTTPException, Request, Response, status
 from pydantic import BaseModel
 import gc
 import copy
+import sys
 import torch
 
 router = APIRouter()
 
 trie = None
 dtrie: Dict = {}
+max_trie_len = 3000
+loop_start_id = 1  # to prevent preloaded prompts from being deleted
+loop_del_trie_id = loop_start_id
 
 
 def init():
@@ -39,10 +43,18 @@ class AddStateBody(BaseModel):
 
 @router.post("/add-state")
 def add_state(body: AddStateBody):
-    global trie, dtrie
+    global trie, dtrie, loop_del_trie_id
     if trie is None:
         raise HTTPException(status.HTTP_400_BAD_REQUEST, "trie not loaded")
 
+    if len(trie) >= max_trie_len:
+        del_prompt = trie[loop_del_trie_id]
+        trie.remove(del_prompt)
+        dtrie[loop_del_trie_id] = None
+        loop_del_trie_id = loop_del_trie_id + 1
+        if loop_del_trie_id >= max_trie_len:
+            loop_del_trie_id = loop_start_id
+
     id = trie.insert(body.prompt)
     device = body.state[0].device
     dtrie[id] = {
@@ -54,6 +66,12 @@ def add_state(body: AddStateBody):
         "device": device,
     }
 
+    quick_log(
+        None,
+        None,
+        f"New Trie Id: {id}\nTrie Len: {len(trie)}\nTrie Buff Size: {trie.buff_size()}\nDtrie Buff Size Of Id: {_get_a_dtrie_buff_size(dtrie[id])}",
+    )
+
     return "success"
 
 
@@ -74,6 +92,23 @@ class LongestPrefixStateBody(BaseModel):
     prompt: str
 
 
+def _get_a_dtrie_buff_size(dtrie_v):
+    # print(sys.getsizeof(dtrie_v["tokens"][0]))  # str
+    # print(sys.getsizeof(dtrie_v["tokens"][0]) * len(dtrie_v["tokens"]))
+    # print(dtrie_v["state"][0][0].element_size())
+    # print(dtrie_v["state"][0].nelement())
+    # print(len(dtrie_v["state"]))
+    # print(
+    #     len(dtrie_v["state"])
+    #     * dtrie_v["state"][0].nelement()
+    #     * dtrie_v["state"][0][0].element_size()
+    # )
+    # print(dtrie_v["logits"][0].element_size())
+    # print(dtrie_v["logits"].nelement())
+    # print(dtrie_v["logits"][0].element_size() * dtrie_v["logits"].nelement())
+    return 54 * len(dtrie_v["tokens"]) + 491520 + 262144 + 28
+
+
 @router.post("/longest-prefix-state")
 def longest_prefix_state(body: LongestPrefixStateBody, request: Request):
     global trie