diff --git a/src/data/ChatBean.ts b/src/data/ChatBean.ts
index 4aaa459..919e8ce 100644
--- a/src/data/ChatBean.ts
+++ b/src/data/ChatBean.ts
@@ -1,3 +1,4 @@
 export default class ChatBean {
     declare id: string
+    declare settings: string
 }
diff --git a/src/data/FileManager.ts b/src/data/FileManager.ts
index 18a47e0..8cac9e9 100644
--- a/src/data/FileManager.ts
+++ b/src/data/FileManager.ts
@@ -2,7 +2,7 @@ import { DatabaseSync } from "node:sqlite"
 import { Buffer } from "node:buffer"
 import path from 'node:path'
 import crypto from 'node:crypto'
-import fs from 'node:fs/promises'
+import fs_sync from 'node:fs'
 
 import { fileTypeFromBuffer } from 'file-type'
 
@@ -12,7 +12,9 @@ export default class FileManager {
         declare name: string
         declare hash: string
         declare mime: string
-        declare chatid: string
+        declare chatid: string | null
+        declare upload_time: number
+        declare last_used_time: number
     }
     
     static File = class {
@@ -20,6 +22,10 @@ export default class FileManager {
         constructor(bean: FileManager.FileBean) {
             this.bean = bean
         }
+        private setAttr(key: string, value: unknown): void {
+            FileManager.database.prepare(`UPDATE ${FileManager.table_name} SET ${key} = ? WHERE count = ?`).run(value, this.bean.count)
+            this.bean[key] = value
+        }
         getMime(): string {
             return this.bean.mime
         }
@@ -37,11 +43,18 @@ export default class FileManager {
                 this.bean.hash
             )
         }
-        getChatId(): string {
+        getChatId(): string | null {
             return this.bean.chatid
         }
-        async readAsync(): Buffer {
-            return await fs.readFile(this.getFilePath())
+        getUploadTime(): number {
+            return this.bean.upload_time
+        }
+        getLastUsedTime(): number {
+            return this.bean.last_used_time
+        }
+        readSync(): Buffer {
+            this.setAttr("last_used_time", Date.now())
+            return fs_sync.readFileSync(this.getFilePath())
         }
     }
 
@@ -55,7 +68,7 @@ export default class FileManager {
                 /* 文件名称 */ name TEXT NOT NULL,
                 /* 文件哈希 */ hash TEXT NOT NULL,
                 /* MIME 类型 */ mime TEXT NOT NULL,
-                /* 来源 Chat */ chatid TEXT NOT NULL,
+                /* 来源 Chat, 可為空 */ chatid TEXT,
                 /* 上传时间 */ upload_time INT8 NOT NULL,
                 /* 最后使用时间 */ last_used_time INT8 NOT NULL
             );
@@ -63,10 +76,16 @@ export default class FileManager {
        return db
     }
     
-    static async uploadFile(fileName: string, data: Buffer, chatId: string) {
+    static uploadFile(fileName: string, data: Buffer, chatId: string | null) {
         const hash = crypto.createHash('sha256').update(data).digest('hex')
+        try {
+            return FileManager.findByHash(hash)
+        } catch(_e) {
+            // Do nothing...
+        }
+        
         const mime = fileTypeFromBuffer(data)
-        await fs.writeFile(
+        fs_sync.writeFileSync(
             path.join(
                 config.data_path, 
                 "files",
diff --git a/src/data/User.ts b/src/data/User.ts
index a0babbb..097c486 100644
--- a/src/data/User.ts
+++ b/src/data/User.ts
@@ -8,6 +8,8 @@ import chalk from 'chalk'
 import config from '../config.ts'
 import UserBean from './UserBean.ts'
 
+import FileManager from './FileManager.ts'
+
 /**
  * User.ts - Wrapper and manager
  * Wrap with UserBean to directly update database
@@ -25,7 +27,7 @@ export default class User {
                 /* 注册时间, 时间戳 */ registered_time INT8 NOT NULL,
                 /* 用戶名, 可選 */ username TEXT,
                 /* 昵称 */ nickname TEXT NOT NULL,
-                /* 头像, 可选 */ avatar BLOB,
+                /* 头像, 可选 */ avatar_file_hash TEXT,
                 /* 设置 */ settings TEXT NOT NULL
             );
        `)
@@ -43,7 +45,7 @@ export default class User {
     }
     
     static create(userName: string | null, nickName: string, avatar: Buffer | null): User {
-        return new User(
+        const user = new User(
             User.findAllBeansByCondition(
                 'count = ?', 
                 User.database.prepare(`INSERT INTO ${User.table_name} (
@@ -51,18 +53,20 @@ export default class User {
                     registered_time,
                     username,
                     nickname,
-                    avatar,
+                    avatar_file_hash,
                     settings
                 ) VALUES (?, ?, ?, ?, ?, ?);`).run(
                     crypto.randomUUID(),
                     Date.now(),
                     userName,
                     nickName,
-                    avatar,
+                    null,
                     "{}"
                 ).lastInsertRowid
             )[0]
         )
+        avatar && user.setAvatar(avatar)
+        return user
     }
     
     private static findAllBeansByCondition(condition: string, ...args: unknown[]): UserBean[] {
@@ -94,7 +98,7 @@ export default class User {
         User.database.prepare(`UPDATE ${User.table_name} SET ${key} = ? WHERE count = ?`).run(value, this.bean.count)
         this.bean[key] = value
     }
-    getUserName(): string {
+    getUserName(): string | null {
         return this.bean.username
     }
     setUserName(userName: string): void {
@@ -106,11 +110,11 @@ export default class User {
     setNickName(nickName: string): void {
         this.setAttr("nickname", nickName)
     }
-    getAvatar(): Uint8Array {
-        return this.bean.avatar
+    getAvatar(): Buffer | null {
+        return FileManager.findByHash(this.bean.avatar_file_hash)?.readSync()
     }
     setAvatar(avatar: Buffer): void {
-        this.setAttr("avatar", avatar)
+        this.setAttr("avatar_file_hash", FileManager.uploadFile(`avatar_user_${this.bean.count}`, avatar).getHash())
     }
     
     getSettings(): User.Settings {
diff --git a/src/data/UserBean.ts b/src/data/UserBean.ts
index 9809170..12c6c30 100644
--- a/src/data/UserBean.ts
+++ b/src/data/UserBean.ts
@@ -1,8 +1,8 @@
 export default class UserBean {
     declare count: number
-    declare username: string
+    declare username: string | null
     declare registered_time: number
     declare nickname: string
-    declare avatar: Uint8Array
+    declare avatar_file_hash: string | null
     declare settings: string
 }