diff --git a/web/src/helpers/consts.ts b/web/src/helpers/consts.ts
deleted file mode 100644
index 4edfce2..0000000
--- a/web/src/helpers/consts.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-// UNKNOWN_ID is the symbol for unknown id
-export const UNKNOWN_ID = -1;
-
-// default animation duration
-export const ANIMATION_DURATION = 200;
-
-// millisecond in a day
-export const DAILY_TIMESTAMP = 3600 * 24 * 1000;
diff --git a/web/src/helpers/storage.ts b/web/src/helpers/storage.ts
deleted file mode 100644
index 3dc4a58..0000000
--- a/web/src/helpers/storage.ts
+++ /dev/null
@@ -1,59 +0,0 @@
-/**
- * Define storage data type
- */
-interface StorageData {
-  placeholder: string;
-}
-
-type StorageKey = keyof StorageData;
-
-/**
- * storage helper
- */
-export function get(keys: StorageKey[]): Partial<StorageData> {
-  const data: Partial<StorageData> = {};
-
-  for (const key of keys) {
-    try {
-      const stringifyValue = localStorage.getItem(key);
-      if (stringifyValue !== null) {
-        const val = JSON.parse(stringifyValue);
-        data[key] = val;
-      }
-    } catch (error: any) {
-      console.error("Get storage failed in ", key, error);
-    }
-  }
-
-  return data;
-}
-
-export function set(data: Partial<StorageData>) {
-  for (const key in data) {
-    try {
-      const stringifyValue = JSON.stringify(data[key as StorageKey]);
-      localStorage.setItem(key, stringifyValue);
-    } catch (error: any) {
-      console.error("Save storage failed in ", key, error);
-    }
-  }
-}
-
-export function remove(keys: StorageKey[]) {
-  for (const key of keys) {
-    try {
-      localStorage.removeItem(key);
-    } catch (error: any) {
-      console.error("Remove storage failed in ", key, error);
-    }
-  }
-}
-
-export function emitStorageChangedEvent() {
-  const iframeEl = document.createElement("iframe");
-  iframeEl.style.display = "none";
-  document.body.appendChild(iframeEl);
-
-  iframeEl.contentWindow?.localStorage.setItem("t", Date.now().toString());
-  iframeEl.remove();
-}
diff --git a/web/src/services/README.md b/web/src/services/README.md
deleted file mode 100644
index bcf4597..0000000
--- a/web/src/services/README.md
+++ /dev/null
@@ -1,6 +0,0 @@
-# Services
-
-What should service do?
-
-- request data api and throw error;
-- dispatch state actions;
diff --git a/web/src/stores/modules/user.ts b/web/src/stores/modules/user.ts
index a02d306..a1e58fc 100644
--- a/web/src/stores/modules/user.ts
+++ b/web/src/stores/modules/user.ts
@@ -1,7 +1,6 @@
 import { createSlice, PayloadAction } from "@reduxjs/toolkit";
 
 interface State {
-  // user is the user who is currently logged in
   user?: User;
 }