diff --git a/app/Caches/ModerationStat.php b/app/Caches/ModerationStat.php
deleted file mode 100644
index 55fa8112..00000000
--- a/app/Caches/ModerationStat.php
+++ /dev/null
@@ -1,44 +0,0 @@
-<?php
-/**
- * @copyright Copyright (c) 2021 深圳市酷瓜软件有限公司
- * @license https://opensource.org/licenses/GPL-2.0
- * @link https://www.koogua.com
- */
-
-namespace App\Caches;
-
-use App\Repos\Stat as StatRepo;
-
-class ModerationStat extends Cache
-{
-
-    protected $lifetime = 15 * 60;
-
-    public function getLifetime()
-    {
-        return $this->lifetime;
-    }
-
-    public function getKey($id = null)
-    {
-        return 'moderation_stat';
-    }
-
-    public function getContent($id = null)
-    {
-        $statRepo = new StatRepo();
-
-        $articleCount = $statRepo->countPendingArticles();
-        $questionCount = $statRepo->countPendingQuestions();
-        $answerCount = $statRepo->countPendingAnswers();
-        $commentCount = $statRepo->countPendingComments();
-
-        return [
-            'article_count' => $articleCount,
-            'question_count' => $questionCount,
-            'answer_count' => $answerCount,
-            'comment_count' => $commentCount,
-        ];
-    }
-
-}
diff --git a/app/Console/Tasks/MaintainTask.php b/app/Console/Tasks/MaintainTask.php
index dc67e75f..1c767d06 100644
--- a/app/Console/Tasks/MaintainTask.php
+++ b/app/Console/Tasks/MaintainTask.php
@@ -10,7 +10,7 @@ namespace App\Console\Tasks;
 use App\Http\Admin\Services\Setting as SettingService;
 use App\Library\Utils\Password as PasswordUtil;
 use App\Models\ChapterVod as ChapterVodModel;
-use App\Services\Utils\IndexCourseCache as IndexCourseCacheUtil;
+use App\Services\Utils\IndexPageCache as IndexPageCacheUtil;
 use App\Validators\Account as AccountValidator;
 
 class MaintainTask extends Task
@@ -26,7 +26,7 @@ class MaintainTask extends Task
     {
         $section = $params[0] ?? null;
 
-        $util = new IndexCourseCacheUtil();
+        $util = new IndexPageCacheUtil();
 
         $util->rebuild($section);
 
@@ -64,34 +64,6 @@ class MaintainTask extends Task
         echo '------ reset password success ------' . PHP_EOL;
     }
 
-    /**
-     * 关闭验证码
-     *
-     * @command: php console.php maintain disable_captcha
-     */
-    public function disableCaptchaAction()
-    {
-        $service = new SettingService();
-
-        $service->updateSettings('captcha', ['enabled' => 0]);
-
-        echo '------ disable captcha success ------' . PHP_EOL;
-    }
-
-    /**
-     * 启用验证码
-     *
-     * @command: php console.php maintain enable_captcha
-     */
-    public function enableCaptchaAction()
-    {
-        $service = new SettingService();
-
-        $service->updateSettings('captcha', ['enabled' => 1]);
-
-        echo '------ enable captcha success ------' . PHP_EOL;
-    }
-
     /**
      * 关闭站点
      *
diff --git a/app/Validators/Account.php b/app/Validators/Account.php
index 7daec3fd..4725f2c2 100644
--- a/app/Validators/Account.php
+++ b/app/Validators/Account.php
@@ -39,7 +39,7 @@ class Account extends Validator
             $account = $accountRepo->findById($name);
         }
 
-        if (!$account || $account->deleted == 1) {
+        if (!$account) {
             throw new BadRequestException('account.not_found');
         }
 
diff --git a/app/Validators/Category.php b/app/Validators/Category.php
index d2caebe0..662844aa 100644
--- a/app/Validators/Category.php
+++ b/app/Validators/Category.php
@@ -137,7 +137,7 @@ class Category extends Validator
         return $status;
     }
 
-    public function checkDeleteAbility($category)
+    public function checkDeleteAbility(CategoryModel $category)
     {
         $categoryRepo = new CategoryRepo();
 
diff --git a/app/Validators/Comment.php b/app/Validators/Comment.php
index 0026cbb9..8d353ebf 100644
--- a/app/Validators/Comment.php
+++ b/app/Validators/Comment.php
@@ -42,19 +42,6 @@ class Comment extends Validator
         return $comment;
     }
 
-    public function checkToUser($userId)
-    {
-        $userRepo = new UserRepo();
-
-        $user = $userRepo->findById($userId);
-
-        if (!$user) {
-            throw new BadRequestException('comment.to_user_not_found');
-        }
-
-        return $user;
-    }
-
     public function checkItem($itemId, $itemType)
     {
         if (!array_key_exists($itemType, CommentModel::itemTypes())) {
diff --git a/app/Validators/CourseUser.php b/app/Validators/CourseUser.php
index 1642733e..53a6a97f 100644
--- a/app/Validators/CourseUser.php
+++ b/app/Validators/CourseUser.php
@@ -15,19 +15,6 @@ use App\Repos\CourseUser as CourseUserRepo;
 class CourseUser extends Validator
 {
 
-    public function checkRelation($id)
-    {
-        $courseUserRepo = new CourseUserRepo();
-
-        $courseUser = $courseUserRepo->findById($id);
-
-        if (!$courseUser) {
-            throw new BadRequestException('course_user.not_found');
-        }
-
-        return $courseUser;
-    }
-
     public function checkCourseUser($courseId, $userId)
     {
         $repo = new CourseUserRepo();
diff --git a/app/Validators/Nav.php b/app/Validators/Nav.php
index bea1b5cc..1d34ad3f 100644
--- a/app/Validators/Nav.php
+++ b/app/Validators/Nav.php
@@ -116,7 +116,7 @@ class Nav extends Validator
         return $status;
     }
 
-    public function checkDeleteAbility($nav)
+    public function checkDeleteAbility(NavModel $nav)
     {
         $navRepo = new NavRepo();
 
diff --git a/config/errors.php b/config/errors.php
index cc7c3359..7b94647c 100644
--- a/config/errors.php
+++ b/config/errors.php
@@ -160,7 +160,6 @@ $error['answer.delete_not_allowed'] = '当前不允许删除回答';
  */
 $error['comment.not_found'] = '评论不存在';
 $error['comment.parent_not_found'] = '上级评论不存在';
-$error['comment.to_user_not_found'] = '回复用户不存在';
 $error['comment.invalid_item_type'] = '无效的条目类型';
 $error['comment.invalid_publish_status'] = '无效的发布状态';
 $error['comment.invalid_reject_reason'] = '无效的拒绝理由';