feat: add channel tabs and chat support

2026-02-12 10:00:58 +08:00 · 2025-08-23 01:23:48 +08:00
266 changed files with 3432 additions and 14298 deletions
--- a/.github/ISSUE_TEMPLATE/新功能建议.md
+++ b/.github/ISSUE_TEMPLATE/新功能建议.md
@@ -1,20 +0,0 @@
---
-name: 新功能建议
-about: 请为该项目提出一个想法
-title: ''
-labels: ''
-assignees: ''
-
---
-
-**你的功能请求是否与某个问题相关？请描述。**
-请清晰、简洁地说明问题。例如：“我经常因为……而感到困扰。”
-
-**你期望的解决方案**
-请清晰、简洁地描述你希望发生的事情/功能如何工作。
-
-**你考虑过的替代方案**
-请清晰、简洁地说明你已考虑过的其他解决方案或功能。
-
-**其他上下文**
-在此添加与功能请求相关的其他信息或截图。
--- a/.github/ISSUE_TEMPLATE/错误-bug报告.md
+++ b/.github/ISSUE_TEMPLATE/错误-bug报告.md
@@ -1,41 +0,0 @@
---
-name: 错误/Bug报告
-about: 创建报告以帮助我们改进
-title: ''
-labels: ''
-assignees: ''
-
---
-
-**描述 Bug**
-对该 Bug 进行清晰简明的描述。
-
-**复现步骤**
-复现该问题的步骤：
-
-1. 进入 '...'
-2. 点击 '...'
-3. 下拉到 '...'
-4. 看到错误
-
-**预期行为**
-清晰简明地描述你期望发生的情况。
-
-**截图**
-如果适用，请添加截图以帮助解释问题。
-
-**桌面端（请完成以下信息）：**
-
-* 操作系统：\[例如 iOS]
-* 浏览器：\[例如 Chrome、Safari]
-* 版本：\[例如 22]
-
-**移动端（请完成以下信息）：**
-
-* 设备：\[例如 iPhone6]
-* 操作系统：\[例如 iOS8.1]
-* 浏览器：\[例如 系统自带浏览器、Safari]
-* 版本：\[例如 22]
-
-**附加上下文**
-在此添加与问题相关的其他上下文信息。
--- a/.github/workflows/deploy-docs.yml
+++ b/.github/workflows/deploy-docs.yml
@@ -1,47 +0,0 @@
-name: Deploy Documentation
-
-on:
-  workflow_call:
-    inputs:
-      build-id:
-        required: false
-        type: string
-  workflow_dispatch:
-
-permissions:
-  contents: write
-
-jobs:
-  build-docs:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 1
-
-      - name: Log build
-        run: echo "Running documentation deployment from build ${{ inputs.build-id }}"
-
-      - name: Setup Bun
-        uses: oven-sh/setup-bun@v1
-        with:
-          bun-version: latest
-
-      - name: Install Bun dependencies
-        run: bun install
-        working-directory: ./docs
-
-      - name: Generate API MDX
-        run: bun run generate
-        working-directory: ./docs
-
-      - name: Build documentation
-        run: bun run build
-        working-directory: ./docs
-
-      - name: Deploy to GitHub Pages
-        uses: JamesIves/github-pages-deploy-action@v4
-        with:
-          branch: gh-pages
-          folder: ./docs/out
--- a/.github/workflows/deploy-staging.yml
+++ b/.github/workflows/deploy-staging.yml
@@ -5,9 +5,6 @@ on:
    branches: [main]
  workflow_dispatch:

-permissions:
-  contents: write
-
 jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
@@ -24,11 +21,3 @@ jobs:
          key: ${{ secrets.SSH_KEY }}
          script: bash /opt/openisle/deploy-staging.sh

-  deploy-docs:
-    needs: build-and-deploy
-    if: ${{ success() }}
-    uses: ./.github/workflows/deploy-docs.yml
-    secrets: inherit
-    with:
-      build-id: ${{ github.run_id }}
-
--- a/.gitignore
+++ b/.gitignore
@@ -1,32 +1,7 @@
-# IDE
 .idea
 target
-
-# log
-logs
-
-# deps
-node_modules
-
-# test & build
-coverage
-out/
-build
-dist
-*.tsbuildinfo
-
-# misc
-.DS_Store
-*.pem
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-pnpm-lock.yaml
-pnpm-workspace.yaml
-
-# env
-*.env
-.env*.local
-
-# others
 openisle.iml
+node_modules
+dist
+open-isle.env
+logs
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -1,32 +0,0 @@
-# OpenIsle Code of Conduct
-
-Like the technical community as a whole, the OpenIsle team and community is made up of a mixture of professionals and volunteers from all over the world, working on every aspect of the mission - including mentorship, teaching, and connecting people.
-
-Diversity is one of our huge strengths, but it can also lead to communication issues and unhappiness. To that end, we have a few ground rules that we ask people to adhere to. This code applies equally to founders, mentors and those seeking help and guidance.
-
-This isn’t an exhaustive list of things that you can’t do. Rather, take it in the spirit in which it’s intended - a guide to make it easier to enrich all of us and the technical communities in which we participate.
-
-This code of conduct applies to all spaces managed by the OpenIsle project or . This includes IRC, the mailing lists, the issue tracker, DSF events, and any other forums created by the project team which the community uses for communication. In addition, violations of this code outside these spaces may affect a person's ability to participate within them.
-
-If you believe someone is violating the code of conduct, we ask that you report it by emailing [](mailto:). For more details please see our 
-
- **Be friendly and patient.**
- **Be welcoming.** We strive to be a community that welcomes and supports people of all backgrounds and identities. This includes, but is not limited to members of any race, ethnicity, culture, national origin, colour, immigration status, social and economic class, educational level, sex, sexual orientation, gender identity and expression, age, size, family status, political belief, religion, and mental and physical ability.
- **Be considerate.** Your work will be used by other people, and you in turn will depend on the work of others. Any decision you take will affect users and colleagues, and you should take those consequences into account when making decisions. Remember that we're a world-wide community, so you might not be communicating in someone else's primary language.
- **Be respectful.** Not all of us will agree all the time, but disagreement is no excuse for poor behavior and poor manners. We might all experience some frustration now and then, but we cannot allow that frustration to turn into a personal attack. It’s important to remember that a community where people feel uncomfortable or threatened is not a productive one. Members of the OpenIsle community should be respectful when dealing with other members as well as with people outside the OpenIsle community.
- **Be careful in the words that you choose.** We are a community of professionals, and we conduct ourselves professionally. Be kind to others. Do not insult or put down other participants. Harassment and other exclusionary behavior aren't acceptable. This includes, but is not limited to: 
- - Violent threats or language directed against another person.
- - Discriminatory jokes and language.
- - Posting sexually explicit or violent material.
- - Posting (or threatening to post) other people's personally identifying information ("doxing").
- - Personal insults, especially those using racist or sexist terms.
- - Unwelcome sexual attention.
- - Advocating for, or encouraging, any of the above behavior.
- - Repeated harassment of others. In general, if someone asks you to stop, then stop.
- **When we disagree, try to understand why.** Disagreements, both social and technical, happen all the time and OpenIsle is no exception. It is important that we resolve disagreements and differing views constructively. Remember that we’re different. The strength of OpenIsle comes from its varied community, people from a wide range of backgrounds. Different people have different perspectives on issues. Being unable to understand why someone holds a viewpoint doesn’t mean that they’re wrong. Don’t forget that it is human to err and blaming each other doesn’t get us anywhere. Instead, focus on helping to resolve issues and learning from mistakes.
-
-Original text courtesy of the [Speak Up! project](http://web.archive.org/web/20141109123859/http://speakup.io/coc.html).
-
-## Questions?
-
-If you have questions, please see . If that doesn't answer your questions, feel free to [contact us](mailto:).
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,202 +1,109 @@
- [前置工作](#前置工作)
- [启动后端服务](#启动后端服务)
-    - [本地 IDEA](#本地-idea)
-        - [配置环境变量](#配置环境变量)
-        - [配置 IDEA 参数](#配置-idea-参数)
-        - [配置 MySQL](#配置-mysql)
-    - [Docker 环境](#docker-环境)
-        - [配置环境变量](#配置环境变量-1)
-        - [构建并启动镜像](#构建并启动镜像)
- [启动前端服务](#启动前端服务)
-    - [配置环境变量](#配置环境变量-2)
-    - [安装依赖和运行](#安装依赖和运行)
- [其他配置](#其他配置)
+#### **⚠️注意：仅想修改前端的朋友可不用部署后端服务**

-## 前置工作
+## 如何部署

-先克隆仓库：
+> Step1 先克隆仓库

 ```shell
 git clone https://github.com/nagisa77/OpenIsle.git
 cd OpenIsle
 ```

- 后端开发环境
-    - JDK 17+
- 前端开发环境
-    - Node.JS 20+
-
-## 启动后端服务
-
-启动后端服务有多种方式，选择一种即可。
-
-> [!IMPORTANT]
-> 仅想修改前端的朋友可不用部署后端服务。转到 [启动前端服务](#启动前端服务) 章节。
-
-### 本地 IDEA
+> Step2 后端部署

 ```shell
-cd backend/
+cd backend
 ```

-IDEA 打开 `backend/` 文件夹。
+以IDEA编辑器为例，IDEA打开backend文件夹。

-#### 配置环境变量
+- 设置VM Option，最好运行在其他端口，非8080，这里设置8081

-1. 生成环境变量文件
-
-    ```shell
-    cp open-isle.env.example open-isle.env
-    ```
-
-    `open-isle.env.example` 是环境变量模板，`open-isle.env` 才是真正读取的内容
-
-2. 修改环境变量，留下需要的，比如你要开发 Google 登录业务，就需要谷歌相关的变量，数据库是一定要的
-
-    ![环境变量](assets/contributing/backend_img_7.png)
-
-3. 应用环境文件，选择刚刚的 `open-isle.env`
-
-可以在 `open-isle.env` 按需填写个性化的配置，该文件不会被 Git 追踪。比如你想把服务跑在 `8082`（默认为 `8080`），那么直接改 `open-isle.env` 即可：
-
-```ini
-SERVER_PORT=8082
+```shell
+-Dserver.port=8081
 ```

-另一种方式是修改 `.properities` 文件（但不建议），位于 `src/main/application.properties`，该配置同样来源于 `open-isle.env`，但修改 `.properties` 文件会被 Git 追踪。
+![CleanShot 2025-08-04 at 11 .35.49.png](https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/4cf210cfc6ea478a80dfc744c85ccdc4.png)

-![配置数据库](assets/contributing/backend_img_5.png)
+- 设置jdk版本为java 17

-#### 配置 IDEA 参数
+![CleanShot 2025-08-04 at 11 .38.03@2x.png](https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/392eeec753ae436ca12a78f750dfea2d.png)

- 设置 JDK 版本为 java 17
+- 本机配置MySQL服务（网上很多教程，忽略）
+- 设置环境变量.env 文件 或.properties 文件（二选一）

- 设置 VM Option，最好运行在其他端口，非 `8080`，这里设置 `8081`
-    若上面在环境变量中设置了端口，那这里就不需要再额外设置
+1. 环境变量文件生成

-    ```shell
-    -Dserver.port=8081
-    ```
-
-![配置1](assets/contributing/backend_img_3.png)
-
-![配置2](assets/contributing/backend_img_2.png)
-
-#### 配置 MySQL
-
-> [!TIP]
-> 如果不知道怎么配置数据库可以参考 [Docker 环境](#docker-环境) 章节
-
-1. 本机配置 MySQL 服务（网上很多教程，忽略）
-
-    + 可以用 Laragon，自带 MySQL 包括 Nodejs，版本建议 `6.x`，`7` 以后需要 Lisence
-    + [下载地址](https://github.com/leokhoa/laragon/releases)
-
-2. 填写环境变量
-
-    ![环境变量](assets/contributing/backend_img_6.png)
-
-    ```ini
-    MYSQL_URL=jdbc:mysql://<数据库地址>:<端口>/<数据库名>?useUnicode=yes&characterEncoding=UTF-8&useInformationSchema=true&useSSL=false&serverTimezone=UTC
-    MYSQL_USER=<数据库用户名>
-    MYSQL_PASSWORD=<数据库密码>
-    ```
-
-3. 执行 [`db/init/init_script.sql`](backend/src/main/resources/db/init/init_script.sql) 脚本，导入基本的数据
-    管理员：**admin/123456**
-    普通用户1：**user1/123456**
-    普通用户2：**user2/123456**
-    
-    ![初始化脚本](assets/contributing/resources_img.png)
-
-#### 配置 Redis
-
-填写环境变量 `.env` 中的 Redis 相关配置并启动 Redis
-
-```ini
-REDIS_HOST=<Redis 地址>
-REDIS_PORT=<Redis 端口>
+```shell
+cp open-isle.env.example open-isle.env
 ```

+修改环境变量，留下需要的，比如你要开发Google登录业务，就需要谷歌相关的变量，数据库是一定要的
+
+![CleanShot 2025-08-04 at 11 .41.36@2x.png](https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/896c8363b6e64ea19d18c12ec4dae2b4.png)
+
+应用环境文件， 选择刚刚的`open-isle.env`
+
+![CleanShot 2025-08-04 at 11 .44.41.png](https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/f588e37838014a6684c141605639b9fa.png)
+
+2. 直接修改 .properities 文件
+
+位置src/main/application.properties, 数据库需要修改标红处，其他按需修改
+
+![CleanShot 2025-08-04 at 11 .47.11@2x.png](https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/28c3104448a245419e0b06aee861abb4.png)
+
 处理完环境问题直接跑起来就能通了

-![运行画面](assets/contributing/backend_img_4.png)
+![CleanShot 2025-08-04 at 11 .49.01@2x.png](https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/2c945eae44b1477db09e80fc96b5e02d.png)

-### Docker 环境
+> Step3 前端部署

-#### 配置环境变量
+前端可以依赖本机部署的后端，也可以直接调用线上的后端接口

 ```shell
-cd docker/
+cd ../frontend_nuxt/
 ```

-主要配置两个 `.env` 文件
-
- `backend/open-isle.env`：后端环境变量，配置同上，见 [配置环境变量](#配置环境变量)。
- `docker/.env`：Docker Compose 环境变量，主要配置 MySQL 相关
-    ```shell
-    cp .env.example .env
-    ```
-
-> [!TIP]
-> 使用单独的 `.env` 文件是为了兼容线上环境或已启用 MySQL 服务的情况，如果只是想快速体验或者启动统一的环境，则推荐使用本方式。
-
-在指定 `docker/.env` 后，`backend/open-isle.env` 中以下配置会被覆盖，这样就确保使用了同一份配置。
-
-```ini
-MYSQL_URL=
-MYSQL_USER=
-MYSQL_PASSWORD=
-```
-
-#### 构建并启动镜像
+copy环境.env文件

 ```shell
-docker compose up -d
+cp .env.staging.example .env
 ```

-如果想了解启动过程发生了什么可以查看日志
+1. 依赖本机部署的后端：打开本文件夹，修改.env 修改为瞄准本机后端端口

-```shell
-docker compose logs
+```yaml
+; 本地部署后端
+NUXT_PUBLIC_API_BASE_URL=https://127.0.0.1:8081
+; 预发环境后端
+; NUXT_PUBLIC_API_BASE_URL=https://staging.open-isle.com
+; 生产环境后端
+; NUXT_PUBLIC_API_BASE_URL=https://www.open-isle.com
 ```

-## 启动前端服务
+2. 依赖预发环境后台环境

-> [!IMPORTANT]
-> **⚠️ 环境要求：Node.js 版本最低 20.0.0（因为 Nuxt 框架要求）**
+**(⚠️强烈推荐只部署前端的朋友使用该环境)**

-```shell
-cd frontend_nuxt/
+```yaml
+; 本地部署后端
+; NUXT_PUBLIC_API_BASE_URL=https://127.0.0.1:8081
+; 预发环境后端
+NUXT_PUBLIC_API_BASE_URL=https://staging.open-isle.com
+; 生产环境后端
+; NUXT_PUBLIC_API_BASE_URL=https://www.open-isle.com
 ```

-### 配置环境变量
+4. 依赖线上后台环境

-前端可以依赖本机部署的后端，也可以直接调用线上的后端接口。
-
- 利用预发环境：**（⚠️ 强烈推荐只开发前端的朋友使用该环境）**
-
-    ```shell
-    cp .env.staging.example .env
-    ```
-
- 利用生产环境
-
-    ```shell
-    cp .env.production.example .env
-    ```
-
- 利用本地环境
-
-    ```shell
-    cp .env.dev.example .env
-    ```
-
-若依赖本机部署的后端，需要修改 `.env` 中的 `NUXT_PUBLIC_API_BASE_URL` 值与后端服务端口一致
-
-### 安装依赖和运行
-
-前端安装依赖并启动服务。
+```yaml
+; 本地部署后端
+; NUXT_PUBLIC_API_BASE_URL=https://127.0.0.1:8081
+; 预发环境后端
+; NUXT_PUBLIC_API_BASE_URL=https://staging.open-isle.com
+; 生产环境后端
+NUXT_PUBLIC_API_BASE_URL=https://www.open-isle.com
+```

 ```shell
 # 安装依赖
@@ -206,49 +113,4 @@ npm install --verbose
 npm run dev
 ```

-如此一来，浏览器访问 http://127.0.0.1:3000 即可访问前端页面。
-
-## 其他配置
-
-### 配置第三方登录，这里以 GitHub 为例：
-
- 修改 `application.properties` 配置
-
-    ![后端配置](assets/contributing/backend_img.png)
-
- 修改 `.env` 配置
-
-    ![前端](assets/contributing/fontend_img.png)
-
- 配置第三方登录回调地址
-
-    ![github配置](assets/contributing/github_img.png)
-
-    ![github配置2](assets/contributing/github_img_2.png)
-
-### 配置 Resend 邮箱服务
-
-https://resend.com/emails 创建账号并登录
-
- `Domains` -> `Add Domain`
-  ![image-20250906150459400](assets/contributing/image-20250906150459400.png)
-
- 填写域名
-  ![image-20250906150541817](assets/contributing/image-20250906150541817.png)
-
- 等待一段时间后解析成功，创建 key
-  `API Keys` -> `Create API Key`，输入名称，设置 `Permission` 为 `Sending access`
-  **Key 只能查看一次，务必保存下来**
-  ![image-20250906150811572](assets/contributing/image-20250906150811572.png)
-  ![image-20250906150924975](assets/contributing/image-20250906150924975.png)
-  ![image-20250906150944130](assets/contributing/image-20250906150944130.png)
- 修改 `.env` 配置中的 `RESEND_API_KEY` 和 `RESEND_FROM_EMAIL`
-  `RESEND_FROM_EMAIL`： **noreply@域名**
-  `RESEND_API_KEY`：**刚刚复制的 Key**
-  ![image-20250906151218330](assets/contributing/image-20250906151218330.png)
-
-## 开源共建和API文档
-
- API文档: https://openisle-docs.netlify.app/docs/openapi
-
-
+如此一来，浏览器访问 http://127.0.0.1:3000 即可访问前端页面
--- a/21
+++ b/21
@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2025 Tim
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
--- a/README.md
+++ b/README.md
@@ -4,8 +4,6 @@
  高效的开源社区前后端平台
  <br><br><br>
  <img alt="Image" src="https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/22752cfac5a04a9c90c41995b9f55fed.png" width="1200">
-    <br><br><br>
-  <a href="https://hellogithub.com/repository/nagisa77/OpenIsle" target="_blank"><img src="https://abroad.hellogithub.com/v1/widgets/recommend.svg?rid=8605546658d94cbab45182af2a02e4c8&claim_uid=p5GNFTtZl6HBAYQ" alt="Featured｜HelloGitHub" style="width: 250px; height: 54px;" width="250" height="54" /></a>
 </p>

 ## 💡 简介
--- a/assets/contributing/backend_img.png
+++ b/assets/contributing/backend_img.png
--- a/assets/contributing/backend_img_2.png
+++ b/assets/contributing/backend_img_2.png
--- a/assets/contributing/backend_img_3.png
+++ b/assets/contributing/backend_img_3.png
--- a/assets/contributing/backend_img_4.png
+++ b/assets/contributing/backend_img_4.png
--- a/assets/contributing/backend_img_5.png
+++ b/assets/contributing/backend_img_5.png
--- a/assets/contributing/backend_img_6.png
+++ b/assets/contributing/backend_img_6.png
--- a/assets/contributing/backend_img_7.png
+++ b/assets/contributing/backend_img_7.png
--- a/assets/contributing/fontend_img.png
+++ b/assets/contributing/fontend_img.png
--- a/assets/contributing/github_img.png
+++ b/assets/contributing/github_img.png
--- a/assets/contributing/github_img_2.png
+++ b/assets/contributing/github_img_2.png
--- a/assets/contributing/image-20250906150459400.png
+++ b/assets/contributing/image-20250906150459400.png
--- a/assets/contributing/image-20250906150541817.png
+++ b/assets/contributing/image-20250906150541817.png
--- a/assets/contributing/image-20250906150811572.png
+++ b/assets/contributing/image-20250906150811572.png
--- a/assets/contributing/image-20250906150924975.png
+++ b/assets/contributing/image-20250906150924975.png
--- a/assets/contributing/image-20250906150944130.png
+++ b/assets/contributing/image-20250906150944130.png
--- a/assets/contributing/image-20250906151218330.png
+++ b/assets/contributing/image-20250906151218330.png
--- a/assets/contributing/resources_img.png
+++ b/assets/contributing/resources_img.png
--- a/backend/open-isle.env.example
+++ b/backend/open-isle.env.example
@@ -1,8 +1,5 @@
-# === Spring Boot ===
-SERVER_PORT=8080
-
 # === Database ===
-MYSQL_URL=jdbc:mysql://<数据库地址>:<数据库端口>/<数据库名>?useUnicode=yes&characterEncoding=UTF-8&useInformationSchema=true&useSSL=false&serverTimezone=UTC
+MYSQL_URL=jdbc:mysql://<数据库地址>:<端口>/<数据库名>?useUnicode=yes&characterEncoding=UTF-8&useInformationSchema=true&useSSL=false&serverTimezone=UTC
 MYSQL_USER=<数据库用户名>
 MYSQL_PASSWORD=<数据库密码>

@@ -13,13 +10,8 @@ JWT_RESET_SECRET=<jwt reset secret>
 JWT_INVITE_SECRET=<jwt invite secret>
 JWT_EXPIRATION=2592000000

-# === Redis ===
-REDIS_HOST=<Redis 地址>
-REDIS_PORT=<Redis 端口>
-
 # === Resend ===
 RESEND_API_KEY=<你的resend-api-key>
-RESEND_FROM_EMAIL=<你的 resend 发送邮箱>

 # === COS ===
 # COS_BASE_URL=https://<你的cos>.cos.ap-guangzhou.myqcloud.com
@@ -36,7 +28,6 @@ TWITTER_CLIENT_ID=<你的twitter-client-id>
 TWITTER_CLIENT_SECRET=<你的-twitter-client-secret>
 DISCORD_CLIENT_ID=<你的discord-client-id>
 DISCORD_CLIENT_SECRET=<你的discord-client-secret>
-TELEGRAM_BOT_TOKEN=<你的telegram-bot-token>

 # === OPENAI ===
 OPENAI_API_KEY=<你的openai-api-key>
@@ -45,10 +36,4 @@ OPENAI_API_KEY=<你的openai-api-key>
 WEBPUSH_PUBLIC_KEY=<你的webpush-public-key>
 WEBPUSH_PRIVATE_KEY=<你的webpush-private-key>

-# === RabbitMQ ===
-RABBITMQ_HOST=<你的rabbitmq_host>
-RABBITMQ_PORT=<你的rabbitmq_port>
-RABBITMQ_USERNAME=<你的rabbitmq_username>
-RABBITMQ_PASSWORD=<你的rabbitmq_password>
-
 # LOG_LEVEL=DEBUG
--- a/backend/pom.xml
+++ b/backend/pom.xml
@@ -26,22 +26,9 @@
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
-    <dependency>
-        <groupId>org.springframework.boot</groupId>
-        <artifactId>spring-boot-starter-amqp</artifactId>
-    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
-      <artifactId>spring-boot-starter-data-redis</artifactId>
-    </dependency>
-    <dependency>
-      <groupId>com.fasterxml.jackson.datatype</groupId>
-      <artifactId>jackson-datatype-jsr310</artifactId>
-    </dependency>
-    <dependency>
-      <groupId>com.fasterxml.jackson.datatype</groupId>
-      <artifactId>jackson-datatype-hibernate6</artifactId>
-      <version>2.20.0</version>
+      <artifactId>spring-boot-starter-websocket</artifactId>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
@@ -127,11 +114,6 @@
      <artifactId>bcprov-jdk15on</artifactId>
      <version>1.70</version>
    </dependency>
-    <dependency>
-      <groupId>org.springdoc</groupId>
-      <artifactId>springdoc-openapi-starter-webmvc-api</artifactId>
-      <version>2.2.0</version>
-    </dependency>
  </dependencies>

  <build>
@@ -159,26 +141,6 @@
          </annotationProcessorPaths>
        </configuration>
      </plugin>
-
-      <plugin>
-        <!-- https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator-maven-plugin/README.md -->
-        <groupId>org.springdoc</groupId>
-        <artifactId>springdoc-openapi-maven-plugin</artifactId>
-        <version>1.4</version>
-        <executions>
-          <execution>
-            <goals>
-              <goal>generate</goal>
-            </goals>
-          </execution>
-        </executions>
-        <configuration>
-          <!-- 此处为硬编码，应优化为 env 的配置 -->
-          <apiDocsUrl>http://localhost:8080/api/v3/api-docs</apiDocsUrl>
-          <outputFileName>openapi.json</outputFileName>
-          <outputDir>${project.build.directory}</outputDir>
-        </configuration>
-      </plugin>
    </plugins>
  </build>
 </project>
--- a/backend/src/main/java/com/openisle/config/CachingConfig.java
+++ b/backend/src/main/java/com/openisle/config/CachingConfig.java
@@ -1,120 +0,0 @@
-package com.openisle.config;
-
-import com.fasterxml.jackson.annotation.JsonAutoDetect;
-import com.fasterxml.jackson.annotation.JsonTypeInfo;
-import com.fasterxml.jackson.annotation.PropertyAccessor;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
-import com.fasterxml.jackson.datatype.hibernate6.Hibernate6Module;
-import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
-import org.springframework.cache.CacheManager;
-import org.springframework.cache.annotation.EnableCaching;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.Primary;
-import org.springframework.data.redis.cache.RedisCacheConfiguration;
-import org.springframework.data.redis.cache.RedisCacheManager;
-import org.springframework.data.redis.connection.RedisConnectionFactory;
-import org.springframework.data.redis.core.RedisTemplate;
-import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
-import org.springframework.data.redis.serializer.RedisSerializationContext;
-import org.springframework.data.redis.serializer.RedisSerializer;
-import org.springframework.data.redis.serializer.StringRedisSerializer;
-
-import java.time.Duration;
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * Redis 缓存配置类
- * @author smallclover
- * @since 2025-09-04
- */
-@Configuration
-@EnableCaching
-public class CachingConfig {
-
-    // 标签缓存名
-    public static final String TAG_CACHE_NAME="openisle_tags";
-    // 分类缓存名
-    public static final String CATEGORY_CACHE_NAME="openisle_categories";
-    // 在线人数缓存名
-    public static final String ONLINE_CACHE_NAME="openisle_online";
-    // 注册验证码
-    public static final String VERIFY_CACHE_NAME="openisle_verify";
-    // 发帖频率限制
-    public static final String LIMIT_CACHE_NAME="openisle_limit";
-
-    /**
-     * 自定义Redis的序列化器
-     * @return
-     */
-    @Bean()
-    @Primary
-    public RedisSerializer<Object> redisSerializer() {
-        // 注册 JavaTimeModule 來支持 Java 8 的日期和时间 API,否则回报一下错误，同时还要引入jsr310
-
-        // org.springframework.data.redis.serializer.SerializationException: Could not write JSON: Java 8 date/time type `java.time.LocalDateTime` not supported by default:
-        // add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling
-        // (through reference chain: java.util.ArrayList[0]->com.openisle.dto.TagDto["createdAt"])
-        // 设置可见性，允许序列化所有元素
-        ObjectMapper objectMapper = new ObjectMapper();
-        objectMapper.registerModule(new JavaTimeModule());
-        // Hibernate6Module 可以自动处理懒加载代理对象。
-        // Tag对象的creator是FetchType.LAZY
-        objectMapper.registerModule(new Hibernate6Module()
-                .disable(Hibernate6Module.Feature.USE_TRANSIENT_ANNOTATION));
-        // service的时候带上类型信息
-        // 启用类型信息，避免 LinkedHashMap 问题
-        objectMapper.activateDefaultTyping(
-                LaissezFaireSubTypeValidator.instance,
-                ObjectMapper.DefaultTyping.NON_FINAL,
-                JsonTypeInfo.As.PROPERTY
-        );
-        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
-        return new GenericJackson2JsonRedisSerializer(objectMapper);
-    }
-
-    /**
-     * 配置 Spring Cache 使用 RedisCacheManager
-     */
-    @Bean
-    public CacheManager cacheManager(RedisConnectionFactory connectionFactory, RedisSerializer<Object> redisSerializer) {
-
-        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
-                .entryTtl(Duration.ZERO) // 默认缓存不过期
-                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
-                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
-                .disableCachingNullValues(); // 禁止缓存 null 值
-
-        // 个别缓存单独设置 TTL 时间
-        Map<String, RedisCacheConfiguration> cacheConfigs = new HashMap<>();
-        RedisCacheConfiguration oneHourConfig = config.entryTtl(Duration.ofHours(1));
-        cacheConfigs.put(TAG_CACHE_NAME, oneHourConfig);
-        cacheConfigs.put(CATEGORY_CACHE_NAME, oneHourConfig);
-
-        return RedisCacheManager.builder(connectionFactory)
-                .cacheDefaults(config)
-                .withInitialCacheConfigurations(cacheConfigs)
-                .build();
-    }
-
-    /**
-     * 配置 RedisTemplate，支持直接操作 Redis
-     */
-    @Bean
-    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory connectionFactory,  RedisSerializer<Object> redisSerializer) {
-        RedisTemplate<String, Object> template = new RedisTemplate<>();
-        template.setConnectionFactory(connectionFactory);
-
-        // key 和 hashKey 使用 String 序列化
-        template.setKeySerializer(new StringRedisSerializer());
-        template.setHashKeySerializer(new StringRedisSerializer());
-
-        // value 和 hashValue 使用 JSON 序列化
-        template.setValueSerializer(redisSerializer);
-        template.setHashValueSerializer(redisSerializer);
-
-        return template;
-    }
-}
--- a/backend/src/main/java/com/openisle/config/ChannelInitializer.java
+++ b/backend/src/main/java/com/openisle/config/ChannelInitializer.java
@@ -1,6 +1,8 @@
 package com.openisle.config;

+import com.openisle.model.Channel;
 import com.openisle.model.MessageConversation;
+import com.openisle.repository.ChannelRepository;
 import com.openisle.repository.MessageConversationRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.boot.CommandLineRunner;
@@ -9,24 +11,25 @@ import org.springframework.stereotype.Component;
@Component
@RequiredArgsConstructor
 public class ChannelInitializer implements CommandLineRunner {
+    private final ChannelRepository channelRepository;
    private final MessageConversationRepository conversationRepository;

    @Override
    public void run(String... args) {
-        if (conversationRepository.countByChannelTrue() == 0) {
-            MessageConversation chat = new MessageConversation();
-            chat.setChannel(true);
-            chat.setName("吹水群");
-            chat.setDescription("吹水聊天");
-            chat.setAvatar("https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/32647273e2334d14adfd4a6ce9db0643.jpeg");
-            conversationRepository.save(chat);
-
-            MessageConversation tech = new MessageConversation();
-            tech.setChannel(true);
-            tech.setName("技术讨论群");
-            tech.setDescription("讨论技术相关话题");
-            tech.setAvatar("https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/5edde9a5864e471caa32491dbcdaa8b2.png");
-            conversationRepository.save(tech);
+        if (channelRepository.count() == 0) {
+            createChannel("吹水群", "闲聊讨论", "/default-avatar.svg");
+            createChannel("技术讨论群", "技术交流", "/default-avatar.svg");
        }
    }
+
+    private void createChannel(String name, String description, String avatar) {
+        MessageConversation conversation = new MessageConversation();
+        conversation = conversationRepository.save(conversation);
+        Channel channel = new Channel();
+        channel.setName(name);
+        channel.setDescription(description);
+        channel.setAvatar(avatar);
+        channel.setConversation(conversation);
+        channelRepository.save(channel);
+    }
 }
--- a/backend/src/main/java/com/openisle/config/OpenApiConfig.java
+++ b/backend/src/main/java/com/openisle/config/OpenApiConfig.java
@@ -1,60 +0,0 @@
-package com.openisle.config;
-
-import io.swagger.v3.oas.models.Components;
-import io.swagger.v3.oas.models.OpenAPI;
-import io.swagger.v3.oas.models.info.Info;
-import io.swagger.v3.oas.models.security.SecurityRequirement;
-import io.swagger.v3.oas.models.security.SecurityScheme;
-import io.swagger.v3.oas.models.servers.Server;
-
-import java.util.List;
-import java.util.stream.Collectors;
-import lombok.RequiredArgsConstructor;
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
-
-@Configuration
-@RequiredArgsConstructor
-public class OpenApiConfig {
-
-    private final SpringDocProperties springDocProperties;
-
-    @Value("${springdoc.info.title}")
-    private String title;
-
-    @Value("${springdoc.info.description}")
-    private String description;
-
-    @Value("${springdoc.info.version}")
-    private String version;
-
-    @Value("${springdoc.info.scheme}")
-    private String scheme;
-
-    @Value("${springdoc.info.header}")
-    private String header;
-
-    @Bean
-    public OpenAPI openAPI() {
-        SecurityScheme securityScheme = new SecurityScheme()
-                        .type(SecurityScheme.Type.HTTP)
-                        .scheme(scheme.toLowerCase())
-                        .bearerFormat("JWT")
-                        .in(SecurityScheme.In.HEADER)
-                        .name(header);
-
-        List<Server> servers = springDocProperties.getServers().stream()
-                .map(s -> new Server().url(s.getUrl()).description(s.getDescription()))
-                .collect(Collectors.toList());
-
-        return new OpenAPI()
-                .servers(servers)
-                .info(new Info()
-                        .title(title)
-                        .description(description)
-                        .version(version))
-                .components(new Components().addSecuritySchemes("JWT", securityScheme))
-                .addSecurityItem(new SecurityRequirement().addList("JWT"));
-    }
-}
--- a/backend/src/main/java/com/openisle/config/RabbitMQConfig.java
+++ b/backend/src/main/java/com/openisle/config/RabbitMQConfig.java
@@ -1,204 +0,0 @@
-package com.openisle.config;
-
-import lombok.RequiredArgsConstructor;
-import org.springframework.amqp.core.Binding;
-import org.springframework.amqp.core.BindingBuilder;
-import org.springframework.amqp.core.Queue;
-import org.springframework.amqp.core.TopicExchange;
-import org.springframework.amqp.rabbit.connection.ConnectionFactory;
-import org.springframework.amqp.rabbit.core.RabbitTemplate;
-import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
-import org.springframework.beans.factory.annotation.Qualifier;
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import org.springframework.amqp.rabbit.core.RabbitAdmin;
-import org.springframework.boot.CommandLineRunner;
-import org.springframework.context.annotation.DependsOn;
-
-import jakarta.annotation.PostConstruct;
-import java.util.ArrayList;
-import java.util.List;
-
-@Configuration
-@RequiredArgsConstructor
-public class RabbitMQConfig {
-
-    public static final String EXCHANGE_NAME = "openisle-exchange";
-    // 保持向后兼容的常量
-    public static final String QUEUE_NAME = "notifications-queue";
-    public static final String ROUTING_KEY = "notifications.routingkey";
-    
-    // 硬编码为16以匹配ShardingStrategy中的十六进制分片逻辑
-    private final int queueCount = 16;
-    
-    @Value("${rabbitmq.queue.durable}")
-    private boolean queueDurable;
-
-    @PostConstruct
-    public void init() {
-        System.out.println("RabbitMQ配置初始化: 队列数量=" + queueCount + ", 持久化=" + queueDurable);
-    }
-
-    @Bean
-    public TopicExchange exchange() {
-        return new TopicExchange(EXCHANGE_NAME);
-    }
-
-    /**
-     * 创建所有分片队列, 使用十六进制后缀 (0-f)
-     */
-    @Bean
-    public List<Queue> shardedQueues() {
-        System.out.println("开始创建分片队列 Bean...");
-        
-        List<Queue> queues = new ArrayList<>();
-        for (int i = 0; i < queueCount; i++) {
-            String shardKey = Integer.toHexString(i);
-            String queueName = "notifications-queue-" + shardKey;
-            Queue queue = new Queue(queueName, queueDurable);
-            queues.add(queue);
-        }
-        
-        System.out.println("分片队列 Bean 创建完成，总数: " + queues.size());
-        return queues;
-    }
-
-    /**
-     * 创建所有分片绑定, 使用十六进制路由键 (notifications.shard.0 - notifications.shard.f)
-     */
-    @Bean
-    public List<Binding> shardedBindings(TopicExchange exchange, @Qualifier("shardedQueues") List<Queue> shardedQueues) {
-        System.out.println("开始创建分片绑定 Bean...");
-        List<Binding> bindings = new ArrayList<>();
-        if (shardedQueues != null) {
-            for (Queue queue : shardedQueues) {
-                String queueName = queue.getName();
-                String shardKey = queueName.substring("notifications-queue-".length());
-                String routingKey = "notifications.shard." + shardKey;
-                Binding binding = BindingBuilder.bind(queue).to(exchange).with(routingKey);
-                bindings.add(binding);
-            }
-        }
-        
-        System.out.println("分片绑定 Bean 创建完成，总数: " + bindings.size());
-        return bindings;
-    }
-
-    /**
-     * 保持向后兼容的单队列配置（可选）
-     */
-    @Bean
-    public Queue legacyQueue() {
-        return new Queue(QUEUE_NAME, queueDurable);
-    }
-
-    /**
-     * 保持向后兼容的单队列绑定（可选）
-     */
-    @Bean
-    public Binding legacyBinding(Queue legacyQueue, TopicExchange exchange) {
-        return BindingBuilder.bind(legacyQueue).to(exchange).with(ROUTING_KEY);
-    }
-
-    @Bean
-    public Jackson2JsonMessageConverter messageConverter() {
-        ObjectMapper objectMapper = new ObjectMapper();
-        objectMapper.registerModule(new com.fasterxml.jackson.datatype.jsr310.JavaTimeModule());
-        objectMapper.disable(com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
-        return new Jackson2JsonMessageConverter(objectMapper);
-    }
-
-    @Bean
-    public RabbitAdmin rabbitAdmin(ConnectionFactory connectionFactory) {
-        return new RabbitAdmin(connectionFactory);
-    }
-
-    @Bean
-    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
-        RabbitTemplate template = new RabbitTemplate(connectionFactory);
-        template.setMessageConverter(messageConverter());
-        return template;
-    }
-
-    /**
-     * 使用 CommandLineRunner 确保在应用完全启动后声明队列到 RabbitMQ
-     * 这样可以确保 RabbitAdmin 和所有 Bean 都已正确初始化
-     */
-    @Bean
-    @DependsOn({"rabbitAdmin", "shardedQueues", "exchange"})
-    public CommandLineRunner queueDeclarationRunner(RabbitAdmin rabbitAdmin,
-                                                   @Qualifier("shardedQueues") List<Queue> shardedQueues,
-                                                   TopicExchange exchange,
-                                                   Queue legacyQueue,
-                                                   @Qualifier("shardedBindings") List<Binding> shardedBindings,
-                                                   Binding legacyBinding) {
-        return args -> {
-            System.out.println("=== 开始主动声明 RabbitMQ 组件 ===");
-            
-            try {
-                // 声明交换
-                rabbitAdmin.declareExchange(exchange);
-                
-                // 声明分片队列 - 检查存在性
-                System.out.println("开始检查并声明 " + shardedQueues.size() + " 个分片队列...");
-                int successCount = 0;
-                int skippedCount = 0;
-                
-                for (Queue queue : shardedQueues) {
-                    String queueName = queue.getName();
-                    try {
-                        // 使用 declareQueue 的返回值判断队列是否已存在
-                        // 如果队列已存在且配置匹配，declareQueue 会返回现有队列信息
-                        // 如果不匹配或不存在，会创建新队列
-                        rabbitAdmin.declareQueue(queue);
-                        successCount++;
-                    } catch (org.springframework.amqp.AmqpIOException e) {
-                        if (e.getMessage().contains("PRECONDITION_FAILED") && e.getMessage().contains("durable")) {
-                            skippedCount++;
-                        }
-                    } catch (Exception e) {
-                        System.err.println("队列声明失败: " + queueName + ", 错误: " + e.getMessage());
-                    }
-                }
-                System.out.println("分片队列处理完成: 成功 " + successCount + ", 跳过 " + skippedCount + ", 总数 " + shardedQueues.size());
-                
-                // 声明分片绑定
-                System.out.println("开始声明 " + shardedBindings.size() + " 个分片绑定...");
-                int bindingSuccessCount = 0;
-                for (Binding binding : shardedBindings) {
-                    try {
-                        rabbitAdmin.declareBinding(binding);
-                        bindingSuccessCount++;
-                    } catch (Exception e) {
-                        System.err.println("绑定声明失败: " + e.getMessage());
-                    }
-                }
-                System.out.println("分片绑定声明完成: 成功 " + bindingSuccessCount + "/" + shardedBindings.size());
-                
-                // 声明遗留队列和绑定 - 检查存在性
-                try {
-                    rabbitAdmin.declareQueue(legacyQueue);
-                    rabbitAdmin.declareBinding(legacyBinding);
-                    System.out.println("遗留队列和绑定就绪: " + QUEUE_NAME + " (已存在或新创建)");
-                } catch (org.springframework.amqp.AmqpIOException e) {
-                    if (e.getMessage().contains("PRECONDITION_FAILED") && e.getMessage().contains("durable")) {
-                        System.out.println("遗留队列已存在但 durable 设置不匹配: " + QUEUE_NAME + ", 保持现有队列");
-                    } else {
-                        System.err.println("遗留队列声明失败: " + QUEUE_NAME + ", 错误: " + e.getMessage());
-                    }
-                } catch (Exception e) {
-                    System.err.println("遗留队列声明失败: " + QUEUE_NAME + ", 错误: " + e.getMessage());
-                }
-                
-                System.out.println("=== RabbitMQ 组件声明完成 ===");
-                System.out.println("请检查 RabbitMQ 管理界面确认队列已正确创建");
-                
-            } catch (Exception e) {
-                System.err.println("RabbitMQ 组件声明过程中发生严重错误:");
-                e.printStackTrace();
-            }
-        };
-    }
-}
--- a/backend/src/main/java/com/openisle/config/RedisConnectionLogger.java
+++ b/backend/src/main/java/com/openisle/config/RedisConnectionLogger.java
@@ -1,35 +0,0 @@
-package com.openisle.config;
-
-import lombok.extern.slf4j.Slf4j;
-import org.springframework.beans.factory.InitializingBean;
-import org.springframework.data.redis.connection.RedisConnectionFactory;
-import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
-import org.springframework.stereotype.Component;
-
-/**
- * Logs a message when a Redis connection is successfully established.
- */
-@Component
-@Slf4j
-public class RedisConnectionLogger implements InitializingBean {
-
-    private final RedisConnectionFactory connectionFactory;
-
-    public RedisConnectionLogger(RedisConnectionFactory connectionFactory) {
-        this.connectionFactory = connectionFactory;
-    }
-
-    @Override
-    public void afterPropertiesSet() {
-        try (var connection = connectionFactory.getConnection()) {
-            connection.ping();
-            if (connectionFactory instanceof LettuceConnectionFactory lettuce) {
-                log.info("Redis connection established at {}:{}", lettuce.getHostName(), lettuce.getPort());
-            } else {
-                log.info("Redis connection established");
-            }
-        } catch (Exception e) {
-            log.error("Failed to connect to Redis", e);
-        }
-    }
-}
--- a/backend/src/main/java/com/openisle/config/SecurityConfig.java
+++ b/backend/src/main/java/com/openisle/config/SecurityConfig.java
@@ -74,14 +74,10 @@ public class SecurityConfig {
        CorsConfiguration cfg = new CorsConfiguration();
        cfg.setAllowedOrigins(List.of(
                "http://127.0.0.1:8080",
-                "http://127.0.0.1:8081",
-                "http://127.0.0.1:8082",
                "http://127.0.0.1:3000",
                "http://127.0.0.1:3001",
                "http://127.0.0.1",
                "http://localhost:8080",
-                "http://localhost:8081",
-                "http://localhost:8082",
                "http://localhost:3000",
                "http://localhost:3001",
                "http://localhost",
@@ -89,10 +85,6 @@ public class SecurityConfig {
                "http://30.211.97.238",
                "http://192.168.7.98",
                "http://192.168.7.98:3000",
-                "https://petstore.swagger.io",
-                // 允许自建OpenAPI地址
-                "https://docs.open-isle.com",
-                "https://www.docs.open-isle.com",
                websiteUrl,
                websiteUrl.replace("://www.", "://")
        ));
@@ -114,7 +106,6 @@ public class SecurityConfig {
            .authorizeHttpRequests(auth -> auth
                    .requestMatchers(HttpMethod.OPTIONS, "/**").permitAll()
                    .requestMatchers("/api/ws/**", "/api/sockjs/**").permitAll()
-                    .requestMatchers("/api/v3/api-docs/**").permitAll()
                    .requestMatchers(HttpMethod.POST, "/api/auth/**").permitAll()
                    .requestMatchers(HttpMethod.GET, "/api/posts/**").permitAll()
                    .requestMatchers(HttpMethod.GET, "/api/comments/**").permitAll()
@@ -130,10 +121,7 @@ public class SecurityConfig {
                    .requestMatchers(HttpMethod.GET, "/api/reaction-types").permitAll()
                    .requestMatchers(HttpMethod.GET, "/api/activities/**").permitAll()
                    .requestMatchers(HttpMethod.GET, "/api/sitemap.xml").permitAll()
-                    .requestMatchers(HttpMethod.GET, "/api/channels").permitAll()
                    .requestMatchers(HttpMethod.GET, "/api/rss").permitAll()
-                    .requestMatchers(HttpMethod.GET, "/api/online/**").permitAll()
-                    .requestMatchers(HttpMethod.POST, "/api/online/**").permitAll()
                    .requestMatchers(HttpMethod.GET, "/api/point-goods").permitAll()
                    .requestMatchers(HttpMethod.POST, "/api/point-goods").permitAll()
                    .requestMatchers(HttpMethod.POST, "/api/categories/**").hasAuthority("ADMIN")
@@ -168,7 +156,7 @@ public class SecurityConfig {
                        uri.startsWith("/api/search") || uri.startsWith("/api/users") ||
                         uri.startsWith("/api/reaction-types") || uri.startsWith("/api/config") ||
                         uri.startsWith("/api/activities") || uri.startsWith("/api/push/public-key") ||
-                                uri.startsWith("/api/point-goods") || uri.startsWith("/api/channels") ||
+                                uri.startsWith("/api/point-goods") ||
                         uri.startsWith("/api/sitemap.xml") || uri.startsWith("/api/medals") ||
                         uri.startsWith("/api/rss"));

@@ -187,9 +175,7 @@ public class SecurityConfig {
                        return;
                    }
                } else if (!uri.startsWith("/api/auth") && !publicGet
-                        && !uri.startsWith("/api/ws") && !uri.startsWith("/api/sockjs")
-                        && !uri.startsWith("/api/v3/api-docs")
-                        && !uri.startsWith("/api/online")) {
+                        && !uri.startsWith("/api/ws") && !uri.startsWith("/api/sockjs")) {
                    response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
                    response.setContentType("application/json");
                    response.getWriter().write("{\"error\": \"Missing token\"}");
--- a/backend/src/main/java/com/openisle/config/ShardInfo.java
+++ b/backend/src/main/java/com/openisle/config/ShardInfo.java
@@ -1,14 +0,0 @@
-package com.openisle.config;
-
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.NoArgsConstructor;
-
-@Data
-@AllArgsConstructor
-@NoArgsConstructor
-public class ShardInfo {
-    private int shardIndex;
-    private String queueName;
-    private String routingKey;
-}
--- a/backend/src/main/java/com/openisle/config/ShardingStrategy.java
+++ b/backend/src/main/java/com/openisle/config/ShardingStrategy.java
@@ -1,84 +0,0 @@
-package com.openisle.config;
-
-import lombok.extern.slf4j.Slf4j;
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.stereotype.Component;
-
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.atomic.AtomicLong;
-import java.util.Map;
-import java.util.stream.Collectors;
-
-@Component
-@Slf4j
-public class ShardingStrategy {
-    
-    // 固定为16以匹配RabbitMQConfig中的十六进制分片逻辑
-    private static final int QUEUE_COUNT = 16;
-    
-    // 分片分布统计
-    private final Map<Integer, AtomicLong> shardCounts = new ConcurrentHashMap<>();
-    
-    /**
-     * 根据用户名获取分片信息（基于哈希值首字符）
-     */
-    public ShardInfo getShardInfo(String username) {
-        if (username == null || username.isEmpty()) {
-            // 空用户名默认分到第0个分片
-            return getShardInfoByIndex(0);
-        }
-        
-        // 计算用户名的哈希值并转为十六进制字符串
-        String hash = Integer.toHexString(Math.abs(username.hashCode()));
-        
-        // 取哈希值的第一个字符 (0-9, a-f)
-        char firstChar = hash.charAt(0);
-        
-        // 十六进制字符映射到队列
-        int shard = getShardFromHexChar(firstChar);
-        recordShardUsage(shard);
-        
-        log.debug("Username '{}' -> hash '{}' -> firstChar '{}' -> shard {}", 
-                 username, hash, firstChar, shard);
-        
-        return getShardInfoByIndex(shard);
-    }
-    
-    /**
-     * 将十六进制字符映射到分片索引
-     */
-    private int getShardFromHexChar(char hexChar) {
-        int charValue;
-        if (hexChar >= '0' && hexChar <= '9') {
-            charValue = hexChar - '0'; // 0-9
-        } else if (hexChar >= 'a' && hexChar <= 'f') {
-            charValue = hexChar - 'a' + 10; // 10-15
-        } else {
-            // 异常情况，默认为0
-            charValue = 0;
-        }
-        
-        // 映射到队列数量范围内
-        return charValue % QUEUE_COUNT;
-    }
-    
-    /**
-     * 根据分片索引获取分片信息
-     */
-    private ShardInfo getShardInfoByIndex(int shard) {
-        String shardKey = Integer.toHexString(shard);
-        return new ShardInfo(
-            shard,
-            "notifications-queue-" + shardKey,
-            "notifications.shard." + shardKey
-        );
-    }
-    
-    /**
-     * 记录分片使用统计
-     */
-    private void recordShardUsage(int shard) {
-        shardCounts.computeIfAbsent(shard, k -> new AtomicLong(0)).incrementAndGet();
-    }
-
-}
--- a/backend/src/main/java/com/openisle/config/SpringDocProperties.java
+++ b/backend/src/main/java/com/openisle/config/SpringDocProperties.java
@@ -1,20 +0,0 @@
-package com.openisle.config;
-
-import java.util.ArrayList;
-import java.util.List;
-import lombok.Data;
-import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.stereotype.Component;
-
-@Data
-@Component
-@ConfigurationProperties(prefix = "springdoc.api-docs")
-public class SpringDocProperties {
-    private List<ServerConfig> servers = new ArrayList<>();
-
-    @Data
-    public static class ServerConfig {
-        private String url;
-        private String description;
-    }
-}
--- a/backend/src/main/java/com/openisle/config/SystemUserInitializer.java
+++ b/backend/src/main/java/com/openisle/config/SystemUserInitializer.java
@@ -1,36 +0,0 @@
-package com.openisle.config;
-
-import com.openisle.model.Role;
-import com.openisle.model.User;
-import com.openisle.repository.UserRepository;
-import lombok.RequiredArgsConstructor;
-import org.springframework.boot.CommandLineRunner;
-import org.springframework.security.crypto.password.PasswordEncoder;
-import org.springframework.stereotype.Component;
-
-/**
- * Ensure a dedicated "system" user exists for internal operations.
- */
-@Component
-@RequiredArgsConstructor
-public class SystemUserInitializer implements CommandLineRunner {
-    private final UserRepository userRepository;
-    private final PasswordEncoder passwordEncoder;
-
-    @Override
-    public void run(String... args) {
-        userRepository.findByUsername("system").orElseGet(() -> {
-            User system = new User();
-            system.setUsername("system");
-            system.setEmail("system@openisle.local");
-            // todo(tim): raw password 采用环境变量
-            system.setPassword(passwordEncoder.encode("system"));
-            system.setRole(Role.USER);
-            system.setVerified(true);
-            system.setApproved(true);
-            system.setAvatar("https://openisle-1307107697.cos.ap-guangzhou.myqcloud.com/assert/image.png");
-            return userRepository.save(system);
-        });
-    }
-}
-
--- a/backend/src/main/java/com/openisle/config/WebSocketConfig.java
+++ b/backend/src/main/java/com/openisle/config/WebSocketConfig.java
@@ -0,0 +1,110 @@
+package com.openisle.config;
+
+import com.openisle.service.JwtService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.messaging.Message;
+import org.springframework.messaging.MessageChannel;
+import org.springframework.messaging.simp.config.ChannelRegistration;
+import org.springframework.messaging.simp.config.MessageBrokerRegistry;
+import org.springframework.messaging.simp.stomp.StompCommand;
+import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
+import org.springframework.messaging.support.ChannelInterceptor;
+import org.springframework.messaging.support.MessageHeaderAccessor;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
+import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
+import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
+
+@Configuration
+@EnableWebSocketMessageBroker
+@RequiredArgsConstructor
+public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
+    
+    private final JwtService jwtService;
+    private final UserDetailsService userDetailsService;
+    @Value("${app.website-url}")
+    private String websiteUrl;
+
+    @Override
+    public void configureMessageBroker(MessageBrokerRegistry config) {
+        // Enable a simple memory-based message broker to carry the messages back to the client on destinations prefixed with "/topic" and "/queue"
+        config.enableSimpleBroker("/topic", "/queue");
+        // Set user destination prefix for personal messages
+        config.setUserDestinationPrefix("/user");
+        // Designates the "/app" prefix for messages that are bound for @MessageMapping-annotated methods.
+        config.setApplicationDestinationPrefixes("/app");
+    }
+
+    @Override
+    public void registerStompEndpoints(StompEndpointRegistry registry) {
+        // 1) 原生 WebSocket（不带 SockJS）
+        registry.addEndpoint("/api/ws")
+                .setAllowedOriginPatterns(
+                        "https://staging.open-isle.com",
+                        "https://www.staging.open-isle.com",
+                        websiteUrl,
+                        websiteUrl.replace("://www.", "://"),
+                        "http://localhost:*",
+                        "http://127.0.0.1:*",
+                        "http://192.168.7.98:*",
+                        "http://30.211.97.238:*"
+                );
+
+        // 2) SockJS 回退：单独路径
+        registry.addEndpoint("/api/sockjs")
+                .setAllowedOriginPatterns(
+                        "https://staging.open-isle.com",
+                        "https://www.staging.open-isle.com",
+                        websiteUrl,
+                        websiteUrl.replace("://www.", "://"),
+                        "http://localhost:*",
+                        "http://127.0.0.1:*",
+                        "http://192.168.7.98:*",
+                        "http://30.211.97.238:*"
+                )
+                .withSockJS()
+                .setWebSocketEnabled(true)
+                .setSessionCookieNeeded(false);
+    }
+
+
+
+    @Override
+    public void configureClientInboundChannel(ChannelRegistration registration) {
+        registration.interceptors(new ChannelInterceptor() {
+            @Override
+            public Message<?> preSend(Message<?> message, MessageChannel channel) {
+                StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
+                
+                if (StompCommand.CONNECT.equals(accessor.getCommand())) {
+                    System.out.println("WebSocket CONNECT command received");
+                    String authHeader = accessor.getFirstNativeHeader("Authorization");
+                    System.out.println("Authorization header: " + (authHeader != null ? "present" : "missing"));
+                    
+                    if (authHeader != null && authHeader.startsWith("Bearer ")) {
+                        String token = authHeader.substring(7);
+                        try {
+                            String username = jwtService.validateAndGetSubject(token);
+                            System.out.println("JWT validated for user: " + username);
+                            var userDetails = userDetailsService.loadUserByUsername(username);
+                            Authentication auth = new UsernamePasswordAuthenticationToken(
+                                userDetails, null, userDetails.getAuthorities());
+                            accessor.setUser(auth);
+                            System.out.println("WebSocket user set: " + username);
+                        } catch (Exception e) {
+                            System.err.println("JWT validation failed: " + e.getMessage());
+                        }
+                    }
+                } else if (StompCommand.SUBSCRIBE.equals(accessor.getCommand())) {
+                    System.out.println("WebSocket SUBSCRIBE to: " + accessor.getDestination());
+                    System.out.println("WebSocket user during subscribe: " + (accessor.getUser() != null ? accessor.getUser().getName() : "null"));
+                }
+                return message;
+            }
+        });
+    }
+}
--- a/backend/src/main/java/com/openisle/controller/AdminPostController.java
+++ b/backend/src/main/java/com/openisle/controller/AdminPostController.java
@@ -37,22 +37,22 @@ public class AdminPostController {
    }

    @PostMapping("/{id}/pin")
-    public PostSummaryDto pin(@PathVariable Long id, org.springframework.security.core.Authentication auth) {
-        return postMapper.toSummaryDto(postService.pinPost(id, auth.getName()));
+    public PostSummaryDto pin(@PathVariable Long id) {
+        return postMapper.toSummaryDto(postService.pinPost(id));
    }

    @PostMapping("/{id}/unpin")
-    public PostSummaryDto unpin(@PathVariable Long id, org.springframework.security.core.Authentication auth) {
-        return postMapper.toSummaryDto(postService.unpinPost(id, auth.getName()));
+    public PostSummaryDto unpin(@PathVariable Long id) {
+        return postMapper.toSummaryDto(postService.unpinPost(id));
    }

    @PostMapping("/{id}/rss-exclude")
-    public PostSummaryDto excludeFromRss(@PathVariable Long id, org.springframework.security.core.Authentication auth) {
-        return postMapper.toSummaryDto(postService.excludeFromRss(id, auth.getName()));
+    public PostSummaryDto excludeFromRss(@PathVariable Long id) {
+        return postMapper.toSummaryDto(postService.excludeFromRss(id));
    }

    @PostMapping("/{id}/rss-include")
-    public PostSummaryDto includeInRss(@PathVariable Long id, org.springframework.security.core.Authentication auth) {
-        return postMapper.toSummaryDto(postService.includeInRss(id, auth.getName()));
+    public PostSummaryDto includeInRss(@PathVariable Long id) {
+        return postMapper.toSummaryDto(postService.includeInRss(id));
    }
 }
--- a/backend/src/main/java/com/openisle/controller/AuthController.java
+++ b/backend/src/main/java/com/openisle/controller/AuthController.java
@@ -1,22 +1,18 @@
 package com.openisle.controller;

-import com.openisle.config.CachingConfig;
 import com.openisle.dto.*;
 import com.openisle.exception.FieldException;
 import com.openisle.model.RegisterMode;
 import com.openisle.model.User;
 import com.openisle.repository.UserRepository;
 import com.openisle.service.*;
-import com.openisle.util.VerifyType;
 import lombok.RequiredArgsConstructor;
 import org.springframework.beans.factory.annotation.Value;
-import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;

 import java.util.Map;
 import java.util.Optional;
-import java.util.concurrent.TimeUnit;

@RestController
@RequestMapping("/api/auth")
@@ -30,7 +26,6 @@ public class AuthController {
    private final GithubAuthService githubAuthService;
    private final DiscordAuthService discordAuthService;
    private final TwitterAuthService twitterAuthService;
-    private final TelegramAuthService telegramAuthService;
    private final RegisterModeService registerModeService;
    private final NotificationService notificationService;
    private final UserRepository userRepository;
@@ -60,8 +55,7 @@ public class AuthController {
                User user = userService.registerWithInvite(
                        req.getUsername(), req.getEmail(), req.getPassword());
                inviteService.consume(req.getInviteToken(), user.getUsername());
-                // 发送确认邮件
-                userService.sendVerifyMail(user, VerifyType.REGISTER);
+                emailService.sendEmail(user.getEmail(), "在网站填写验证码以验证", "您的验证码是 " + user.getVerificationCode());
                return ResponseEntity.ok(Map.of(
                        "token", jwtService.generateToken(user.getUsername()),
                        "reason_code", "INVITE_APPROVED"
@@ -75,8 +69,7 @@ public class AuthController {
        }
        User user = userService.register(
                req.getUsername(), req.getEmail(), req.getPassword(), "", registerModeService.getRegisterMode());
-        // 发送确认邮件
-        userService.sendVerifyMail(user, VerifyType.REGISTER);
+        emailService.sendEmail(user.getEmail(), "在网站填写验证码以验证", "您的验证码是 " + user.getVerificationCode());
        if (!user.isApproved()) {
            notificationService.createRegisterRequestNotifications(user, user.getRegisterReason());
        }
@@ -85,12 +78,13 @@ public class AuthController {

    @PostMapping("/verify")
    public ResponseEntity<?> verify(@RequestBody VerifyRequest req) {
-        Optional<User> userOpt = userService.findByUsername(req.getUsername());
-        if (userOpt.isEmpty()) {
-            return ResponseEntity.badRequest().body(Map.of("error", "Invalid credentials"));
-        }
-        boolean ok = userService.verifyCode(userOpt.get(), req.getCode(), VerifyType.REGISTER);
+        boolean ok = userService.verifyCode(req.getUsername(), req.getCode());
        if (ok) {
+            Optional<User> userOpt = userService.findByUsername(req.getUsername());
+            if (userOpt.isEmpty()) {
+                return ResponseEntity.badRequest().body(Map.of("error", "Invalid credentials"));
+            }
+
            User user = userOpt.get();

            if (user.isApproved()) {
@@ -127,7 +121,7 @@ public class AuthController {
        User user = userOpt.get();
        if (!user.isVerified()) {
            user = userService.register(user.getUsername(), user.getEmail(), user.getPassword(), user.getRegisterReason(), registerModeService.getRegisterMode());
-            userService.sendVerifyMail(user, VerifyType.REGISTER);
+            emailService.sendEmail(user.getEmail(), "在网站填写验证码以验证", "您的验证码是 " + user.getVerificationCode());
            return ResponseEntity.badRequest().body(Map.of(
                    "error", "User not verified",
                    "reason_code", "NOT_VERIFIED",
@@ -366,51 +360,6 @@ public class AuthController {
        ));
    }

-    @PostMapping("/telegram")
-    public ResponseEntity<?> loginWithTelegram(@RequestBody TelegramLoginRequest req) {
-        boolean viaInvite = req.getInviteToken() != null && !req.getInviteToken().isEmpty();
-        InviteService.InviteValidateResult inviteValidateResult = inviteService.validate(req.getInviteToken());
-        if (viaInvite && !inviteValidateResult.isValidate()) {
-            return ResponseEntity.badRequest().body(Map.of("error", "Invalid invite token"));
-        }
-        Optional<AuthResult> resultOpt = telegramAuthService.authenticate(
-                req,
-                registerModeService.getRegisterMode(),
-                viaInvite);
-        if (resultOpt.isPresent()) {
-            AuthResult result = resultOpt.get();
-            if (viaInvite && result.isNewUser()) {
-                inviteService.consume(req.getInviteToken(), inviteValidateResult.getInviteToken().getInviter().getUsername());
-                return ResponseEntity.ok(Map.of(
-                        "token", jwtService.generateToken(result.getUser().getUsername()),
-                        "reason_code", "INVITE_APPROVED"
-                ));
-            }
-            if (RegisterMode.DIRECT.equals(registerModeService.getRegisterMode())) {
-                return ResponseEntity.ok(Map.of("token", jwtService.generateToken(result.getUser().getUsername())));
-            }
-            if (!result.getUser().isApproved()) {
-                if (result.getUser().getRegisterReason() != null && !result.getUser().getRegisterReason().isEmpty()) {
-                    return ResponseEntity.badRequest().body(Map.of(
-                            "error", "Account awaiting approval",
-                            "reason_code", "IS_APPROVING",
-                            "token", jwtService.generateReasonToken(result.getUser().getUsername())
-                    ));
-                }
-                return ResponseEntity.badRequest().body(Map.of(
-                        "error", "Account awaiting approval",
-                        "reason_code", "NOT_APPROVED",
-                        "token", jwtService.generateReasonToken(result.getUser().getUsername())
-                ));
-            }
-            return ResponseEntity.ok(Map.of("token", jwtService.generateToken(result.getUser().getUsername())));
-        }
-        return ResponseEntity.badRequest().body(Map.of(
-                "error", "Invalid telegram data",
-                "reason_code", "INVALID_CREDENTIALS"
-        ));
-    }
-
    @GetMapping("/check")
    public ResponseEntity<?> checkToken() {
        return ResponseEntity.ok(Map.of("valid", true));
@@ -422,17 +371,14 @@ public class AuthController {
        if (userOpt.isEmpty()) {
            return ResponseEntity.badRequest().body(Map.of("error", "User not found"));
        }
-        userService.sendVerifyMail(userOpt.get(), VerifyType.RESET_PASSWORD);
+        String code = userService.generatePasswordResetCode(req.getEmail());
+        emailService.sendEmail(req.getEmail(), "请填写验证码以重置密码", "您的验证码是" + code);
        return ResponseEntity.ok(Map.of("message", "Verification code sent"));
    }

    @PostMapping("/forgot/verify")
    public ResponseEntity<?> verifyReset(@RequestBody VerifyForgotRequest req) {
-        Optional<User> userOpt = userService.findByEmail(req.getEmail());
-        if (userOpt.isEmpty()) {
-            return ResponseEntity.badRequest().body(Map.of("error", "User not found"));
-        }
-        boolean ok = userService.verifyCode(userOpt.get(), req.getCode(), VerifyType.RESET_PASSWORD);
+        boolean ok = userService.verifyPasswordResetCode(req.getEmail(), req.getCode());
        if (ok) {
            String username = userService.findByEmail(req.getEmail()).get().getUsername();
            return ResponseEntity.ok(Map.of("token", jwtService.generateResetToken(username)));
--- a/backend/src/main/java/com/openisle/controller/ChannelController.java
+++ b/backend/src/main/java/com/openisle/controller/ChannelController.java
@@ -1,42 +1,82 @@
 package com.openisle.controller;

 import com.openisle.dto.ChannelDto;
+import com.openisle.model.Channel;
+import com.openisle.model.MessageParticipant;
+import com.openisle.model.MessageConversation;
 import com.openisle.model.User;
+import com.openisle.repository.ChannelRepository;
+import com.openisle.repository.MessageParticipantRepository;
 import com.openisle.repository.UserRepository;
-import com.openisle.service.ChannelService;
-import com.openisle.service.MessageService;
+import com.openisle.repository.MessageRepository;
 import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.Authentication;
 import org.springframework.web.bind.annotation.*;

 import java.util.List;
+import java.util.stream.Collectors;

@RestController
@RequestMapping("/api/channels")
@RequiredArgsConstructor
 public class ChannelController {
-    private final ChannelService channelService;
-    private final MessageService messageService;
+    private final ChannelRepository channelRepository;
+    private final MessageParticipantRepository participantRepository;
    private final UserRepository userRepository;
+    private final MessageRepository messageRepository;

    private Long getCurrentUserId(Authentication auth) {
-        User user = userRepository.findByUsername(auth.getName())
-                .orElseThrow(() -> new IllegalArgumentException("User not found"));
+        User user = userRepository.findByUsername(auth.getName()).orElseThrow(() -> new IllegalArgumentException("User not found"));
        return user.getId();
    }

    @GetMapping
-    public List<ChannelDto> listChannels(Authentication auth) {
-        return channelService.listChannels(getCurrentUserId(auth));
+    public ResponseEntity<List<ChannelDto>> listChannels(Authentication auth) {
+        Long userId = auth == null ? null : getCurrentUserId(auth);
+        List<ChannelDto> channels = channelRepository.findAll().stream()
+                .map(c -> toDto(c, userId))
+                .collect(Collectors.toList());
+        return ResponseEntity.ok(channels);
    }

-    @PostMapping("/{channelId}/join")
-    public ChannelDto joinChannel(@PathVariable Long channelId, Authentication auth) {
-        return channelService.joinChannel(channelId, getCurrentUserId(auth));
+    @PostMapping("/{id}/join")
+    public ResponseEntity<Void> joinChannel(@PathVariable Long id, Authentication auth) {
+        Channel channel = channelRepository.findById(id).orElseThrow(() -> new IllegalArgumentException("Channel not found"));
+        Long userId = getCurrentUserId(auth);
+        boolean exists = channel.getConversation().getParticipants().stream().anyMatch(p -> p.getUser().getId().equals(userId));
+        if (!exists) {
+            MessageParticipant participant = new MessageParticipant();
+            participant.setConversation(channel.getConversation());
+            participant.setUser(userRepository.findById(userId).orElseThrow(() -> new IllegalArgumentException("User not found")));
+            participantRepository.save(participant);
+        }
+        return ResponseEntity.ok().build();
    }

-    @GetMapping("/unread-count")
-    public long unreadCount(Authentication auth) {
-        return messageService.getUnreadChannelCount(getCurrentUserId(auth));
+    private ChannelDto toDto(Channel channel, Long userId) {
+        ChannelDto dto = new ChannelDto();
+        dto.setId(channel.getId());
+        dto.setName(channel.getName());
+        dto.setDescription(channel.getDescription());
+        dto.setAvatar(channel.getAvatar());
+        if (channel.getConversation() != null) {
+            MessageConversation conversation = channel.getConversation();
+            dto.setConversationId(conversation.getId());
+            dto.setMemberCount(conversation.getParticipants().size());
+            if (userId != null) {
+                MessageParticipant self = conversation.getParticipants().stream()
+                        .filter(p -> p.getUser().getId().equals(userId))
+                        .findFirst().orElse(null);
+                if (self != null) {
+                    var lastRead = self.getLastReadAt();
+                    dto.setUnreadCount(messageRepository
+                            .countByConversationIdAndCreatedAtAfterAndSenderIdNot(conversation.getId(),
+                                    lastRead == null ? java.time.LocalDateTime.of(1970,1,1,0,0) : lastRead,
+                                    userId));
+                }
+            }
+        }
+        return dto;
    }
 }
--- a/backend/src/main/java/com/openisle/controller/MessageController.java
+++ b/backend/src/main/java/com/openisle/controller/MessageController.java
@@ -5,6 +5,7 @@ import com.openisle.dto.ConversationDto;
 import com.openisle.dto.CreateConversationRequest;
 import com.openisle.dto.CreateConversationResponse;
 import com.openisle.dto.MessageDto;
+import com.openisle.dto.UserSummaryDto;
 import com.openisle.model.Message;
 import com.openisle.model.MessageConversation;
 import com.openisle.model.User;
@@ -54,16 +55,16 @@ public class MessageController {

    @PostMapping
    public ResponseEntity<MessageDto> sendMessage(@RequestBody MessageRequest req, Authentication auth) {
-        Message message = messageService.sendMessage(getCurrentUserId(auth), req.getRecipientId(), req.getContent(), req.getReplyToId());
-        return ResponseEntity.ok(messageService.toDto(message));
+        Message message = messageService.sendMessage(getCurrentUserId(auth), req.getRecipientId(), req.getContent());
+        return ResponseEntity.ok(toDto(message));
    }

    @PostMapping("/conversations/{conversationId}/messages")
    public ResponseEntity<MessageDto> sendMessageToConversation(@PathVariable Long conversationId,
-                                                                @RequestBody ChannelMessageRequest req,
+                                                                @RequestBody ContentRequest req,
                                                                Authentication auth) {
-        Message message = messageService.sendMessageToConversation(getCurrentUserId(auth), conversationId, req.getContent(), req.getReplyToId());
-        return ResponseEntity.ok(messageService.toDto(message));
+        Message message = messageService.sendMessageToConversation(getCurrentUserId(auth), conversationId, req.getContent());
+        return ResponseEntity.ok(toDto(message));
    }

    @PostMapping("/conversations/{conversationId}/read")
@@ -78,6 +79,23 @@ public class MessageController {
        return ResponseEntity.ok(new CreateConversationResponse(conversation.getId()));
    }

+    private MessageDto toDto(Message message) {
+        MessageDto dto = new MessageDto();
+        dto.setId(message.getId());
+        dto.setContent(message.getContent());
+        dto.setCreatedAt(message.getCreatedAt());
+
+        dto.setConversationId(message.getConversation().getId());
+
+        UserSummaryDto senderDto = new UserSummaryDto();
+        senderDto.setId(message.getSender().getId());
+        senderDto.setUsername(message.getSender().getUsername());
+        senderDto.setAvatar(message.getSender().getAvatar());
+        dto.setSender(senderDto);
+
+        return dto;
+    }
+
    @GetMapping("/unread-count")
    public ResponseEntity<Long> getUnreadCount(Authentication auth) {
        return ResponseEntity.ok(messageService.getUnreadMessageCount(getCurrentUserId(auth)));
@@ -87,7 +105,6 @@ public class MessageController {
    static class MessageRequest {
        private Long recipientId;
        private String content;
-        private Long replyToId;

        public Long getRecipientId() {
            return recipientId;
@@ -104,19 +121,10 @@ public class MessageController {
        public void setContent(String content) {
            this.content = content;
        }
-
-        public Long getReplyToId() {
-            return replyToId;
-        }
-
-        public void setReplyToId(Long replyToId) {
-            this.replyToId = replyToId;
-        }
    }

-    static class ChannelMessageRequest {
+    static class ContentRequest {
        private String content;
-        private Long replyToId;

        public String getContent() {
            return content;
@@ -125,13 +133,5 @@ public class MessageController {
        public void setContent(String content) {
            this.content = content;
        }
-
-        public Long getReplyToId() {
-            return replyToId;
-        }
-
-        public void setReplyToId(Long replyToId) {
-            this.replyToId = replyToId;
-        }
    }
 }
--- a/backend/src/main/java/com/openisle/controller/NotificationController.java
+++ b/backend/src/main/java/com/openisle/controller/NotificationController.java
@@ -62,14 +62,4 @@ public class NotificationController {
    public void updatePref(@RequestBody NotificationPreferenceUpdateRequest req, Authentication auth) {
        notificationService.updatePreference(auth.getName(), req.getType(), req.isEnabled());
    }
-
-    @GetMapping("/email-prefs")
-    public List<NotificationPreferenceDto> emailPrefs(Authentication auth) {
-        return notificationService.listEmailPreferences(auth.getName());
-    }
-
-    @PostMapping("/email-prefs")
-    public void updateEmailPref(@RequestBody NotificationPreferenceUpdateRequest req, Authentication auth) {
-        notificationService.updateEmailPreference(auth.getName(), req.getType(), req.isEnabled());
-    }
 }
--- a/backend/src/main/java/com/openisle/controller/OnlineController.java
+++ b/backend/src/main/java/com/openisle/controller/OnlineController.java
@@ -1,33 +0,0 @@
-package com.openisle.controller;
-
-import com.openisle.config.CachingConfig;
-import lombok.RequiredArgsConstructor;
-import org.springframework.data.redis.core.RedisTemplate;
-import org.springframework.data.redis.core.StringRedisTemplate;
-import org.springframework.web.bind.annotation.*;
-
-import java.time.Duration;
-
-/**
- * @author smallclover
- * @since 2025-09-05
- * 统计在线人数
- */
-@RestController
-@RequestMapping("/api/online")
-@RequiredArgsConstructor
-public class OnlineController {
-
-    private final RedisTemplate redisTemplate;
-    private static final String ONLINE_KEY = CachingConfig.ONLINE_CACHE_NAME +":";
-
-    @PostMapping("/heartbeat")
-    public void ping(@RequestParam String userId){
-        redisTemplate.opsForValue().set(ONLINE_KEY+userId,"1", Duration.ofSeconds(150));
-    }
-
-    @GetMapping("/count")
-    public long count(){
-        return redisTemplate.keys(ONLINE_KEY+"*").size();
-    }
-}
--- a/backend/src/main/java/com/openisle/controller/PointHistoryController.java
+++ b/backend/src/main/java/com/openisle/controller/PointHistoryController.java
@@ -7,11 +7,9 @@ import lombok.RequiredArgsConstructor;
 import org.springframework.security.core.Authentication;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;

 import java.util.List;
-import java.util.Map;
 import java.util.stream.Collectors;

@RestController
@@ -27,10 +25,4 @@ public class PointHistoryController {
                .map(pointHistoryMapper::toDto)
                .collect(Collectors.toList());
    }
-
-    @GetMapping("/trend")
-    public List<Map<String, Object>> trend(Authentication auth,
-                                          @RequestParam(value = "days", defaultValue = "30") int days) {
-        return pointService.trend(auth.getName(), days);
-    }
 }
--- a/backend/src/main/java/com/openisle/controller/PostChangeLogController.java
+++ b/backend/src/main/java/com/openisle/controller/PostChangeLogController.java
@@ -1,25 +0,0 @@
-package com.openisle.controller;
-
-import com.openisle.dto.PostChangeLogDto;
-import com.openisle.mapper.PostChangeLogMapper;
-import com.openisle.service.PostChangeLogService;
-import lombok.RequiredArgsConstructor;
-import org.springframework.web.bind.annotation.*;
-
-import java.util.List;
-import java.util.stream.Collectors;
-
-@RestController
-@RequestMapping("/api/posts")
-@RequiredArgsConstructor
-public class PostChangeLogController {
-    private final PostChangeLogService changeLogService;
-    private final PostChangeLogMapper mapper;
-
-    @GetMapping("/{id}/change-logs")
-    public List<PostChangeLogDto> listLogs(@PathVariable Long id) {
-        return changeLogService.listLogs(id).stream()
-                .map(mapper::toDto)
-                .collect(Collectors.toList());
-    }
-}
--- a/backend/src/main/java/com/openisle/controller/PostController.java
+++ b/backend/src/main/java/com/openisle/controller/PostController.java
@@ -3,7 +3,6 @@ package com.openisle.controller;
 import com.openisle.dto.PostDetailDto;
 import com.openisle.dto.PostRequest;
 import com.openisle.dto.PostSummaryDto;
-import com.openisle.dto.PollDto;
 import com.openisle.mapper.PostMapper;
 import com.openisle.model.Post;
 import com.openisle.service.*;
@@ -42,9 +41,7 @@ public class PostController {
        Post post = postService.createPost(auth.getName(), req.getCategoryId(),
                req.getTitle(), req.getContent(), req.getTagIds(),
                req.getType(), req.getPrizeDescription(), req.getPrizeIcon(),
-                req.getPrizeCount(), req.getPointCost(),
-                req.getStartTime(), req.getEndTime(),
-                req.getOptions(), req.getMultiple());
+                req.getPrizeCount(), req.getStartTime(), req.getEndTime());
        draftService.deleteDraft(auth.getName());
        PostDetailDto dto = postMapper.toDetailDto(post, auth.getName());
        dto.setReward(levelService.awardForPost(auth.getName()));
@@ -88,17 +85,6 @@ public class PostController {
        return ResponseEntity.ok().build();
    }

-    @GetMapping("/{id}/poll/progress")
-    public ResponseEntity<PollDto> pollProgress(@PathVariable Long id) {
-        return ResponseEntity.ok(postMapper.toSummaryDto(postService.getPoll(id)).getPoll());
-    }
-
-    @PostMapping("/{id}/poll/vote")
-    public ResponseEntity<Void> vote(@PathVariable Long id, @RequestParam("option") List<Integer> option, Authentication auth) {
-        postService.votePoll(id, auth.getName(), option);
-        return ResponseEntity.ok().build();
-    }
-
    @GetMapping
    public List<PostSummaryDto> listPosts(@RequestParam(value = "categoryId", required = false) Long categoryId,
                                   @RequestParam(value = "categoryIds", required = false) List<Long> categoryIds,
--- a/backend/src/main/java/com/openisle/controller/ReactionController.java
+++ b/backend/src/main/java/com/openisle/controller/ReactionController.java
@@ -36,7 +36,6 @@ public class ReactionController {
                                                   Authentication auth) {
        Reaction reaction = reactionService.reactToPost(auth.getName(), postId, req.getType());
        if (reaction == null) {
-            pointService.deductForReactionOfPost(auth.getName(), postId);
            return ResponseEntity.noContent().build();
        }
        ReactionDto dto = reactionMapper.toDto(reaction);
@@ -51,7 +50,6 @@ public class ReactionController {
                                                      Authentication auth) {
        Reaction reaction = reactionService.reactToComment(auth.getName(), commentId, req.getType());
        if (reaction == null) {
-            pointService.deductForReactionOfComment(auth.getName(), commentId);
            return ResponseEntity.noContent().build();
        }
        ReactionDto dto = reactionMapper.toDto(reaction);
@@ -59,17 +57,4 @@ public class ReactionController {
        pointService.awardForReactionOfComment(auth.getName(), commentId);
        return ResponseEntity.ok(dto);
    }
-
-    @PostMapping("/messages/{messageId}/reactions")
-    public ResponseEntity<ReactionDto> reactToMessage(@PathVariable Long messageId,
-                                                      @RequestBody ReactionRequest req,
-                                                      Authentication auth) {
-        Reaction reaction = reactionService.reactToMessage(auth.getName(), messageId, req.getType());
-        if (reaction == null) {
-            return ResponseEntity.noContent().build();
-        }
-        ReactionDto dto = reactionMapper.toDto(reaction);
-        dto.setReward(levelService.awardForReaction(auth.getName()));
-        return ResponseEntity.ok(dto);
-    }
 }
--- a/backend/src/main/java/com/openisle/controller/RssController.java
+++ b/backend/src/main/java/com/openisle/controller/RssController.java
@@ -41,7 +41,7 @@ public class RssController {

    // 兼容 Markdown/HTML 两类图片写法（用于 enclosure）
    private static final Pattern MD_IMAGE = Pattern.compile("!\\[[^\\]]*\\]\\(([^)]+)\\)");
-    private static final Pattern HTML_IMAGE = Pattern.compile("<BaseImage[^>]+src=[\"']?([^\"'>]+)[\"']?[^>]*>");
+    private static final Pattern HTML_IMAGE = Pattern.compile("<img[^>]+src=[\"']?([^\"'>]+)[\"']?[^>]*>");

    private static final DateTimeFormatter RFC1123 = DateTimeFormatter.RFC_1123_DATE_TIME;

--- a/backend/src/main/java/com/openisle/controller/UserController.java
+++ b/backend/src/main/java/com/openisle/controller/UserController.java
@@ -105,17 +105,6 @@ public class UserController {
                .collect(java.util.stream.Collectors.toList());
    }

-    @GetMapping("/{identifier}/subscribed-posts")
-    public java.util.List<PostMetaDto> subscribedPosts(@PathVariable("identifier") String identifier,
-                                                       @RequestParam(value = "limit", required = false) Integer limit) {
-        int l = limit != null ? limit : defaultPostsLimit;
-        User user = userService.findByIdentifier(identifier).orElseThrow();
-        return subscriptionService.getSubscribedPosts(user.getUsername()).stream()
-                .limit(l)
-                .map(userMapper::toMetaDto)
-                .collect(java.util.stream.Collectors.toList());
-    }
-
    @GetMapping("/{identifier}/replies")
    public java.util.List<CommentInfoDto> userReplies(@PathVariable("identifier") String identifier,
                                                      @RequestParam(value = "limit", required = false) Integer limit) {
--- a/backend/src/main/java/com/openisle/dto/ChannelDto.java
+++ b/backend/src/main/java/com/openisle/dto/ChannelDto.java
@@ -10,8 +10,7 @@ public class ChannelDto {
    private String name;
    private String description;
    private String avatar;
-    private MessageDto lastMessage;
-    private long memberCount;
-    private boolean joined;
+    private Long conversationId;
+    private int memberCount;
    private long unreadCount;
 }
--- a/backend/src/main/java/com/openisle/dto/ConversationDetailDto.java
+++ b/backend/src/main/java/com/openisle/dto/ConversationDetailDto.java
@@ -8,9 +8,7 @@ import java.util.List;
@Data
 public class ConversationDetailDto {
    private Long id;
-    private String name;
-    private boolean channel;
-    private String avatar;
    private List<UserSummaryDto> participants;
    private Page<MessageDto> messages;
+    private ChannelDto channel;
 }
--- a/backend/src/main/java/com/openisle/dto/ConversationDto.java
+++ b/backend/src/main/java/com/openisle/dto/ConversationDto.java
@@ -3,6 +3,7 @@ package com.openisle.dto;
 import lombok.Getter;
 import lombok.Setter;

+
 import java.time.LocalDateTime;
 import java.util.List;

@@ -10,11 +11,9 @@ import java.util.List;
@Setter
 public class ConversationDto {
    private Long id;
-    private String name;
-    private boolean channel;
-    private String avatar;
    private MessageDto lastMessage;
    private List<UserSummaryDto> participants;
    private LocalDateTime createdAt;
    private long unreadCount;
+    private ChannelDto channel;
 }
--- a/backend/src/main/java/com/openisle/dto/LotteryDto.java
+++ b/backend/src/main/java/com/openisle/dto/LotteryDto.java
@@ -10,7 +10,6 @@ public class LotteryDto {
    private String prizeDescription;
    private String prizeIcon;
    private int prizeCount;
-    private int pointCost;
    private LocalDateTime startTime;
    private LocalDateTime endTime;
    private List<AuthorDto> participants;
--- a/backend/src/main/java/com/openisle/dto/MessageDto.java
+++ b/backend/src/main/java/com/openisle/dto/MessageDto.java
@@ -2,7 +2,6 @@ package com.openisle.dto;

 import lombok.Data;
 import java.time.LocalDateTime;
-import java.util.List;

@Data
 public class MessageDto {
@@ -11,6 +10,4 @@ public class MessageDto {
    private UserSummaryDto sender;
    private Long conversationId;
    private LocalDateTime createdAt;
-    private MessageDto replyTo;
-    private List<ReactionDto> reactions;
 }
--- a/backend/src/main/java/com/openisle/dto/MessageNotificationPayload.java
+++ b/backend/src/main/java/com/openisle/dto/MessageNotificationPayload.java
@@ -1,15 +0,0 @@
-package com.openisle.dto;
-
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.NoArgsConstructor;
-
-import java.io.Serializable;
-
-@Data
-@NoArgsConstructor
-@AllArgsConstructor
-public class MessageNotificationPayload implements Serializable {
-    private String targetUsername;
-    private Object payload;
-}
--- a/backend/src/main/java/com/openisle/dto/PollDto.java
+++ b/backend/src/main/java/com/openisle/dto/PollDto.java
@@ -1,17 +0,0 @@
-package com.openisle.dto;
-
-import lombok.Data;
-
-import java.time.LocalDateTime;
-import java.util.List;
-import java.util.Map;
-
-@Data
-public class PollDto {
-    private List<String> options;
-    private Map<Integer, Integer> votes;
-    private LocalDateTime endTime;
-    private List<AuthorDto> participants;
-    private Map<Integer, List<AuthorDto>> optionParticipants;
-    private boolean multiple;
-}
--- a/backend/src/main/java/com/openisle/dto/PostChangeLogDto.java
+++ b/backend/src/main/java/com/openisle/dto/PostChangeLogDto.java
@@ -1,32 +0,0 @@
-package com.openisle.dto;
-
-import com.openisle.model.PostChangeType;
-import lombok.Getter;
-import lombok.Setter;
-
-import java.time.LocalDateTime;
-import java.util.List;
-
-@Getter
-@Setter
-public class PostChangeLogDto {
-    private Long id;
-    private String username;
-    private String userAvatar;
-    private PostChangeType type;
-    private LocalDateTime time;
-    private String oldTitle;
-    private String newTitle;
-    private String oldContent;
-    private String newContent;
-    private CategoryDto oldCategory;
-    private CategoryDto newCategory;
-    private List<TagDto> oldTags;
-    private List<TagDto> newTags;
-    private Boolean oldClosed;
-    private Boolean newClosed;
-    private LocalDateTime oldPinnedAt;
-    private LocalDateTime newPinnedAt;
-    private Boolean oldFeatured;
-    private Boolean newFeatured;
-}
--- a/backend/src/main/java/com/openisle/dto/PostRequest.java
+++ b/backend/src/main/java/com/openisle/dto/PostRequest.java
@@ -23,11 +23,7 @@ public class PostRequest {
    private String prizeDescription;
    private String prizeIcon;
    private Integer prizeCount;
-    private Integer pointCost;
    private LocalDateTime startTime;
    private LocalDateTime endTime;
-    // fields for poll posts
-    private List<String> options;
-    private Boolean multiple;
 }

--- a/backend/src/main/java/com/openisle/dto/PostSummaryDto.java
+++ b/backend/src/main/java/com/openisle/dto/PostSummaryDto.java
@@ -31,7 +31,6 @@ public class PostSummaryDto {
    private int pointReward;
    private PostType type;
    private LotteryDto lottery;
-    private PollDto poll;
    private boolean rssExcluded;
    private boolean closed;
 }
--- a/backend/src/main/java/com/openisle/dto/ReactionDto.java
+++ b/backend/src/main/java/com/openisle/dto/ReactionDto.java
@@ -4,7 +4,7 @@ import com.openisle.model.ReactionType;
 import lombok.Data;

 /**
- * DTO representing a reaction on a post, comment or message.
+ * DTO representing a reaction on a post or comment.
 */
@Data
 public class ReactionDto {
@@ -13,7 +13,6 @@ public class ReactionDto {
    private String user;
    private Long postId;
    private Long commentId;
-    private Long messageId;
    private int reward;
 }

--- a/backend/src/main/java/com/openisle/dto/TelegramLoginRequest.java
+++ b/backend/src/main/java/com/openisle/dto/TelegramLoginRequest.java
@@ -1,16 +0,0 @@
-package com.openisle.dto;
-
-import lombok.Data;
-
-/** Request for Telegram login. */
-@Data
-public class TelegramLoginRequest {
-    private String id;
-    private String firstName;
-    private String lastName;
-    private String username;
-    private String photoUrl;
-    private Long authDate;
-    private String hash;
-    private String inviteToken;
-}
--- a/backend/src/main/java/com/openisle/mapper/PostChangeLogMapper.java
+++ b/backend/src/main/java/com/openisle/mapper/PostChangeLogMapper.java
@@ -1,92 +0,0 @@
-package com.openisle.mapper;
-
-import com.openisle.dto.CategoryDto;
-import com.openisle.dto.PostChangeLogDto;
-import com.openisle.dto.TagDto;
-import com.openisle.model.*;
-import com.openisle.repository.CategoryRepository;
-import com.openisle.repository.TagRepository;
-import lombok.RequiredArgsConstructor;
-import org.springframework.stereotype.Component;
-
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import java.util.stream.Collectors;
-
-@Component
-@RequiredArgsConstructor
-public class PostChangeLogMapper {
-
-    private final CategoryRepository categoryRepository;
-    private final TagRepository tagRepository;
-    private final CategoryMapper categoryMapper;
-    private final TagMapper tagMapper;
-
-    public PostChangeLogDto toDto(PostChangeLog log) {
-        PostChangeLogDto dto = new PostChangeLogDto();
-        dto.setId(log.getId());
-        if (log.getUser() != null) {
-            dto.setUsername(log.getUser().getUsername());
-            dto.setUserAvatar(log.getUser().getAvatar());
-        }
-        dto.setType(log.getType());
-        dto.setTime(log.getCreatedAt());
-        if (log instanceof PostTitleChangeLog t) {
-            dto.setOldTitle(t.getOldTitle());
-            dto.setNewTitle(t.getNewTitle());
-        } else if (log instanceof PostContentChangeLog c) {
-            dto.setOldContent(c.getOldContent());
-            dto.setNewContent(c.getNewContent());
-        } else if (log instanceof PostCategoryChangeLog cat) {
-            dto.setOldCategory(mapCategory(cat.getOldCategory()));
-            dto.setNewCategory(mapCategory(cat.getNewCategory()));
-        } else if (log instanceof PostTagChangeLog tag) {
-            dto.setOldTags(mapTags(tag.getOldTags()));
-            dto.setNewTags(mapTags(tag.getNewTags()));
-        } else if (log instanceof PostClosedChangeLog cl) {
-            dto.setOldClosed(cl.isOldClosed());
-            dto.setNewClosed(cl.isNewClosed());
-        } else if (log instanceof PostPinnedChangeLog p) {
-            dto.setOldPinnedAt(p.getOldPinnedAt());
-            dto.setNewPinnedAt(p.getNewPinnedAt());
-        } else if (log instanceof PostFeaturedChangeLog f) {
-            dto.setOldFeatured(f.isOldFeatured());
-            dto.setNewFeatured(f.isNewFeatured());
-        }
-        return dto;
-    }
-
-    private CategoryDto mapCategory(String name) {
-        if (name == null) {
-            return null;
-        }
-        return categoryRepository.findByName(name)
-                .map(categoryMapper::toDto)
-                .orElseGet(() -> {
-                    CategoryDto dto = new CategoryDto();
-                    dto.setName(name);
-                    return dto;
-                });
-    }
-
-    private List<TagDto> mapTags(String tags) {
-        if (tags == null || tags.isBlank()) {
-            return Collections.emptyList();
-        }
-        return Arrays.stream(tags.split(","))
-                .map(String::trim)
-                .map(this::mapTag)
-                .collect(Collectors.toList());
-    }
-
-    private TagDto mapTag(String name) {
-        return tagRepository.findByName(name)
-                .map(tagMapper::toDto)
-                .orElseGet(() -> {
-                    TagDto dto = new TagDto();
-                    dto.setName(name);
-                    return dto;
-                });
-    }
-}
--- a/backend/src/main/java/com/openisle/mapper/PostMapper.java
+++ b/backend/src/main/java/com/openisle/mapper/PostMapper.java
@@ -5,24 +5,18 @@ import com.openisle.dto.PostDetailDto;
 import com.openisle.dto.PostSummaryDto;
 import com.openisle.dto.ReactionDto;
 import com.openisle.dto.LotteryDto;
-import com.openisle.dto.PollDto;
-import com.openisle.dto.AuthorDto;
 import com.openisle.model.CommentSort;
 import com.openisle.model.Post;
 import com.openisle.model.LotteryPost;
-import com.openisle.model.PollPost;
 import com.openisle.model.User;
-import com.openisle.model.PollVote;
 import com.openisle.service.CommentService;
 import com.openisle.service.ReactionService;
 import com.openisle.service.SubscriptionService;
-import com.openisle.repository.PollVoteRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Component;

 import java.time.LocalDateTime;
 import java.util.List;
-import java.util.Map;
 import java.util.stream.Collectors;

 /** Mapper responsible for converting posts into DTOs. */
@@ -38,7 +32,6 @@ public class PostMapper {
    private final UserMapper userMapper;
    private final TagMapper tagMapper;
    private final CategoryMapper categoryMapper;
-    private final PollVoteRepository pollVoteRepository;

    public PostSummaryDto toSummaryDto(Post post) {
        PostSummaryDto dto = new PostSummaryDto();
@@ -93,26 +86,11 @@ public class PostMapper {
            l.setPrizeDescription(lp.getPrizeDescription());
            l.setPrizeIcon(lp.getPrizeIcon());
            l.setPrizeCount(lp.getPrizeCount());
-            l.setPointCost(lp.getPointCost());
            l.setStartTime(lp.getStartTime());
            l.setEndTime(lp.getEndTime());
            l.setParticipants(lp.getParticipants().stream().map(userMapper::toAuthorDto).collect(Collectors.toList()));
            l.setWinners(lp.getWinners().stream().map(userMapper::toAuthorDto).collect(Collectors.toList()));
            dto.setLottery(l);
        }
-
-        if (post instanceof PollPost pp) {
-            PollDto p = new PollDto();
-            p.setOptions(pp.getOptions());
-            p.setVotes(pp.getVotes());
-            p.setEndTime(pp.getEndTime());
-            p.setParticipants(pp.getParticipants().stream().map(userMapper::toAuthorDto).collect(Collectors.toList()));
-            Map<Integer, List<AuthorDto>> optionParticipants = pollVoteRepository.findByPostId(pp.getId()).stream()
-                    .collect(Collectors.groupingBy(PollVote::getOptionIndex,
-                            Collectors.mapping(v -> userMapper.toAuthorDto(v.getUser()), Collectors.toList())));
-            p.setOptionParticipants(optionParticipants);
-            p.setMultiple(Boolean.TRUE.equals(pp.getMultiple()));
-            dto.setPoll(p);
-        }
    }
 }
--- a/backend/src/main/java/com/openisle/mapper/ReactionMapper.java
+++ b/backend/src/main/java/com/openisle/mapper/ReactionMapper.java
@@ -19,9 +19,6 @@ public class ReactionMapper {
        if (reaction.getComment() != null) {
            dto.setCommentId(reaction.getComment().getId());
        }
-        if (reaction.getMessage() != null) {
-            dto.setMessageId(reaction.getMessage().getId());
-        }
        dto.setReward(0);
        return dto;
    }
--- a/backend/src/main/java/com/openisle/model/Channel.java
+++ b/backend/src/main/java/com/openisle/model/Channel.java
@@ -0,0 +1,27 @@
+package com.openisle.model;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Table(name = "channels")
+@Getter
+@Setter
+@NoArgsConstructor
+public class Channel {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String name;
+
+    private String description;
+
+    private String avatar;
+
+    @OneToOne
+    @JoinColumn(name = "conversation_id")
+    private MessageConversation conversation;
+}
--- a/backend/src/main/java/com/openisle/model/Comment.java
+++ b/backend/src/main/java/com/openisle/model/Comment.java
@@ -5,8 +5,6 @@ import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import org.hibernate.annotations.CreationTimestamp;
-import org.hibernate.annotations.SQLDelete;
-import org.hibernate.annotations.Where;

 import java.time.LocalDateTime;

@@ -15,8 +13,6 @@ import java.time.LocalDateTime;
@Setter
@NoArgsConstructor
@Table(name = "comments")
-@SQLDelete(sql = "UPDATE comments SET deleted_at = CURRENT_TIMESTAMP(6) WHERE id = ?")
-@Where(clause = "deleted_at IS NULL")
 public class Comment {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
@@ -45,7 +41,4 @@ public class Comment {
    @Column
    private LocalDateTime pinnedAt;

-    @Column(name = "deleted_at")
-    private LocalDateTime deletedAt;
-
 }
--- a/backend/src/main/java/com/openisle/model/Draft.java
+++ b/backend/src/main/java/com/openisle/model/Draft.java
@@ -22,7 +22,7 @@ public class Draft {

    private String title;

-    @Column(columnDefinition = "LONGTEXT")
+    @Column(columnDefinition = "TEXT")
    private String content;

    @ManyToOne(fetch = FetchType.LAZY, optional = false)
--- a/backend/src/main/java/com/openisle/model/InviteToken.java
+++ b/backend/src/main/java/com/openisle/model/InviteToken.java
@@ -14,13 +14,6 @@ public class InviteToken {
    @Id
    private String token;

-    /**
-     * Short token used in invite links. Existing records may have this field null
-     * and fall back to {@link #token} for backward compatibility.
-     */
-    @Column(unique = true)
-    private String shortToken;
-
    @ManyToOne
    private User inviter;

--- a/backend/src/main/java/com/openisle/model/LotteryPost.java
+++ b/backend/src/main/java/com/openisle/model/LotteryPost.java
@@ -26,9 +26,6 @@ public class LotteryPost extends Post {
    @Column(nullable = false)
    private int prizeCount;

-    @Column(nullable = false)
-    private int pointCost;
-
    @Column
    private LocalDateTime startTime;

--- a/backend/src/main/java/com/openisle/model/Message.java
+++ b/backend/src/main/java/com/openisle/model/Message.java
@@ -1,6 +1,5 @@
 package com.openisle.model;

-import com.fasterxml.jackson.annotation.JsonBackReference;
 import jakarta.persistence.*;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -21,7 +20,6 @@ public class Message {

    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    @JoinColumn(name = "conversation_id")
-    @JsonBackReference
    private MessageConversation conversation;

    @ManyToOne(optional = false, fetch = FetchType.LAZY)
@@ -31,10 +29,6 @@ public class Message {
    @Column(nullable = false, columnDefinition = "TEXT")
    private String content;

-    @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "reply_to_id")
-    private Message replyTo;
-
    @CreationTimestamp
    @Column(nullable = false, updatable = false)
    private LocalDateTime createdAt;
--- a/backend/src/main/java/com/openisle/model/MessageConversation.java
+++ b/backend/src/main/java/com/openisle/model/MessageConversation.java
@@ -1,7 +1,5 @@
 package com.openisle.model;

-import com.fasterxml.jackson.annotation.JsonBackReference;
-import com.fasterxml.jackson.annotation.JsonManagedReference;
 import jakarta.persistence.*;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -22,18 +20,6 @@ public class MessageConversation {
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

-    // Indicates whether this conversation represents a public channel
-    @Column(nullable = false)
-    private boolean channel = false;
-
-    // Channel metadata
-    private String name;
-
-    @Column(columnDefinition = "TEXT")
-    private String description;
-
-    private String avatar;
-
    @CreationTimestamp
    @Column(nullable = false, updatable = false)
    private LocalDateTime createdAt;
@@ -43,10 +29,8 @@ public class MessageConversation {
    private Message lastMessage;

    @OneToMany(mappedBy = "conversation", cascade = CascadeType.ALL, orphanRemoval = true)
-    @JsonBackReference
    private Set<MessageParticipant> participants = new HashSet<>();

    @OneToMany(mappedBy = "conversation", cascade = CascadeType.ALL, orphanRemoval = true)
-    @JsonBackReference
    private Set<Message> messages = new HashSet<>();
 }
--- a/backend/src/main/java/com/openisle/model/MessageParticipant.java
+++ b/backend/src/main/java/com/openisle/model/MessageParticipant.java
@@ -1,6 +1,5 @@
 package com.openisle.model;

-import com.fasterxml.jackson.annotation.JsonBackReference;
 import jakarta.persistence.*;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -20,7 +19,6 @@ public class MessageParticipant {

    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    @JoinColumn(name = "conversation_id")
-    @JsonBackReference
    private MessageConversation conversation;

    @ManyToOne(optional = false, fetch = FetchType.LAZY)
--- a/backend/src/main/java/com/openisle/model/NotificationType.java
+++ b/backend/src/main/java/com/openisle/model/NotificationType.java
@@ -40,12 +40,6 @@ public enum NotificationType {
    LOTTERY_WIN,
    /** Your lottery post was drawn */
    LOTTERY_DRAW,
-    /** Someone participated in your poll */
-    POLL_VOTE,
-    /** Your poll post has concluded */
-    POLL_RESULT_OWNER,
-    /** A poll you participated in has concluded */
-    POLL_RESULT_PARTICIPANT,
    /** Your post was featured */
    POST_FEATURED,
    /** You were mentioned in a post or comment */
--- a/backend/src/main/java/com/openisle/model/PointHistory.java
+++ b/backend/src/main/java/com/openisle/model/PointHistory.java
@@ -4,8 +4,6 @@ import jakarta.persistence.*;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
-import org.hibernate.annotations.SQLDelete;
-import org.hibernate.annotations.Where;

 import java.time.LocalDateTime;

@@ -15,8 +13,6 @@ import java.time.LocalDateTime;
@Setter
@NoArgsConstructor
@Table(name = "point_histories")
-@SQLDelete(sql = "UPDATE point_histories SET deleted_at = CURRENT_TIMESTAMP(6) WHERE id = ?")
-@Where(clause = "deleted_at IS NULL")
 public class PointHistory {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
@@ -50,7 +46,4 @@ public class PointHistory {

    @Column(name = "created_at", nullable = false)
    private LocalDateTime createdAt;
-
-    @Column(name = "deleted_at")
-    private LocalDateTime deletedAt;
 }
--- a/backend/src/main/java/com/openisle/model/PointHistoryType.java
+++ b/backend/src/main/java/com/openisle/model/PointHistoryType.java
@@ -5,12 +5,8 @@ public enum PointHistoryType {
    COMMENT,
    POST_LIKED,
    COMMENT_LIKED,
-    POST_LIKE_CANCELLED,
-    COMMENT_LIKE_CANCELLED,
    INVITE,
    FEATURE,
    SYSTEM_ONLINE,
-    REDEEM,
-    LOTTERY_JOIN,
-    LOTTERY_REWARD
+    REDEEM
 }
--- a/backend/src/main/java/com/openisle/model/PollPost.java
+++ b/backend/src/main/java/com/openisle/model/PollPost.java
@@ -1,43 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.*;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-import java.time.LocalDateTime;
-import java.util.*;
-
-@Entity
-@Table(name = "poll_posts")
-@Getter
-@Setter
-@NoArgsConstructor
-@PrimaryKeyJoinColumn(name = "post_id")
-public class PollPost extends Post {
-    @ElementCollection
-    @CollectionTable(name = "poll_post_options", joinColumns = @JoinColumn(name = "post_id"))
-    @Column(name = "option_text")
-    private List<String> options = new ArrayList<>();
-
-    @ElementCollection
-    @CollectionTable(name = "poll_post_votes", joinColumns = @JoinColumn(name = "post_id"))
-    @MapKeyColumn(name = "option_index")
-    @Column(name = "vote_count")
-    private Map<Integer, Integer> votes = new HashMap<>();
-
-    @ManyToMany
-    @JoinTable(name = "poll_participants",
-            joinColumns = @JoinColumn(name = "post_id"),
-            inverseJoinColumns = @JoinColumn(name = "user_id"))
-    private Set<User> participants = new HashSet<>();
-
-    @Column
-    private Boolean multiple = false;
-
-    @Column
-    private LocalDateTime endTime;
-
-    @Column
-    private boolean resultAnnounced = false;
-}
--- a/backend/src/main/java/com/openisle/model/PollVote.java
+++ b/backend/src/main/java/com/openisle/model/PollVote.java
@@ -1,28 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.*;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-@Entity
-@Table(name = "poll_votes", uniqueConstraints = @UniqueConstraint(columnNames = {"post_id", "user_id", "option_index"}))
-@Getter
-@Setter
-@NoArgsConstructor
-public class PollVote {
-    @Id
-    @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private Long id;
-
-    @ManyToOne(fetch = FetchType.LAZY, optional = false)
-    @JoinColumn(name = "post_id")
-    private PollPost post;
-
-    @ManyToOne(fetch = FetchType.LAZY, optional = false)
-    @JoinColumn(name = "user_id")
-    private User user;
-
-    @Column(name = "option_index", nullable = false)
-    private int optionIndex;
-}
--- a/backend/src/main/java/com/openisle/model/Post.java
+++ b/backend/src/main/java/com/openisle/model/Post.java
@@ -31,7 +31,7 @@ public class Post {
    @Column(nullable = false)
    private String title;

-    @Column(nullable = false, columnDefinition = "LONGTEXT")
+    @Column(nullable = false, columnDefinition = "TEXT")
    private String content;

    @CreationTimestamp
--- a/backend/src/main/java/com/openisle/model/PostCategoryChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostCategoryChangeLog.java
@@ -1,17 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.Entity;
-import jakarta.persistence.Table;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_category_change_logs")
-public class PostCategoryChangeLog extends PostChangeLog {
-    private String oldCategory;
-    private String newCategory;
-}
--- a/backend/src/main/java/com/openisle/model/PostChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostChangeLog.java
@@ -1,37 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.*;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-import org.hibernate.annotations.CreationTimestamp;
-
-import java.time.LocalDateTime;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_change_logs")
-@Inheritance(strategy = InheritanceType.JOINED)
-public abstract class PostChangeLog {
-    @Id
-    @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private Long id;
-
-    @ManyToOne(fetch = FetchType.LAZY, optional = false)
-    @JoinColumn(name = "post_id")
-    private Post post;
-
-    @ManyToOne(fetch = FetchType.LAZY, optional = true)
-    @JoinColumn(name = "user_id")
-    private User user;
-
-    @CreationTimestamp
-    @Column(nullable = false, updatable = false)
-    private LocalDateTime createdAt;
-
-    @Enumerated(EnumType.STRING)
-    @Column(nullable = false)
-    private PostChangeType type;
-}
--- a/backend/src/main/java/com/openisle/model/PostChangeType.java
+++ b/backend/src/main/java/com/openisle/model/PostChangeType.java
@@ -1,13 +0,0 @@
-package com.openisle.model;
-
-public enum PostChangeType {
-    CONTENT,
-    TITLE,
-    CATEGORY,
-    TAG,
-    CLOSED,
-    PINNED,
-    FEATURED,
-    VOTE_RESULT,
-    LOTTERY_RESULT
-}
--- a/backend/src/main/java/com/openisle/model/PostClosedChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostClosedChangeLog.java
@@ -1,17 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.Entity;
-import jakarta.persistence.Table;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_closed_change_logs")
-public class PostClosedChangeLog extends PostChangeLog {
-    private boolean oldClosed;
-    private boolean newClosed;
-}
--- a/backend/src/main/java/com/openisle/model/PostContentChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostContentChangeLog.java
@@ -1,21 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.Column;
-import jakarta.persistence.Entity;
-import jakarta.persistence.Table;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_content_change_logs")
-public class PostContentChangeLog extends PostChangeLog {
-    @Column(name = "old_content", columnDefinition = "LONGTEXT")
-    private String oldContent;
-
-    @Column(name = "new_content", columnDefinition = "LONGTEXT")
-    private String newContent;
-}
--- a/backend/src/main/java/com/openisle/model/PostFeaturedChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostFeaturedChangeLog.java
@@ -1,17 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.Entity;
-import jakarta.persistence.Table;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_featured_change_logs")
-public class PostFeaturedChangeLog extends PostChangeLog {
-    private boolean oldFeatured;
-    private boolean newFeatured;
-}
--- a/backend/src/main/java/com/openisle/model/PostLotteryResultChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostLotteryResultChangeLog.java
@@ -1,16 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.Entity;
-import jakarta.persistence.Table;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_lottery_result_change_logs")
-public class PostLotteryResultChangeLog extends PostChangeLog {
-}
-
--- a/backend/src/main/java/com/openisle/model/PostPinnedChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostPinnedChangeLog.java
@@ -1,19 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.Entity;
-import jakarta.persistence.Table;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-import java.time.LocalDateTime;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_pinned_change_logs")
-public class PostPinnedChangeLog extends PostChangeLog {
-    private LocalDateTime oldPinnedAt;
-    private LocalDateTime newPinnedAt;
-}
--- a/backend/src/main/java/com/openisle/model/PostTagChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostTagChangeLog.java
@@ -1,21 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.Column;
-import jakarta.persistence.Entity;
-import jakarta.persistence.Table;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_tag_change_logs")
-public class PostTagChangeLog extends PostChangeLog {
-    @Column(name = "old_tags")
-    private String oldTags;
-
-    @Column(name = "new_tags")
-    private String newTags;
-}
--- a/backend/src/main/java/com/openisle/model/PostTitleChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostTitleChangeLog.java
@@ -1,17 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.Entity;
-import jakarta.persistence.Table;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_title_change_logs")
-public class PostTitleChangeLog extends PostChangeLog {
-    private String oldTitle;
-    private String newTitle;
-}
--- a/backend/src/main/java/com/openisle/model/PostType.java
+++ b/backend/src/main/java/com/openisle/model/PostType.java
@@ -2,6 +2,5 @@ package com.openisle.model;

 public enum PostType {
    NORMAL,
-    LOTTERY,
-    POLL
+    LOTTERY
 }
--- a/backend/src/main/java/com/openisle/model/PostVoteResultChangeLog.java
+++ b/backend/src/main/java/com/openisle/model/PostVoteResultChangeLog.java
@@ -1,16 +0,0 @@
-package com.openisle.model;
-
-import jakarta.persistence.Entity;
-import jakarta.persistence.Table;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-
-@Getter
-@Setter
-@NoArgsConstructor
-@Entity
-@Table(name = "post_vote_result_change_logs")
-public class PostVoteResultChangeLog extends PostChangeLog {
-}
-
--- a/backend/src/main/java/com/openisle/model/Reaction.java
+++ b/backend/src/main/java/com/openisle/model/Reaction.java
@@ -7,7 +7,7 @@ import lombok.Setter;
 import org.hibernate.annotations.CreationTimestamp;

 /**
- * Reaction entity representing a user's reaction to a post, comment or message.
+ * Reaction entity representing a user's reaction to a post or comment.
 */
@Entity
@Getter
@@ -16,8 +16,7 @@ import org.hibernate.annotations.CreationTimestamp;
@Table(name = "reactions",
       uniqueConstraints = {
           @UniqueConstraint(columnNames = {"user_id", "post_id", "type"}),
-           @UniqueConstraint(columnNames = {"user_id", "comment_id", "type"}),
-           @UniqueConstraint(columnNames = {"user_id", "message_id", "type"})
+           @UniqueConstraint(columnNames = {"user_id", "comment_id", "type"})
       })
 public class Reaction {
    @Id
@@ -40,10 +39,6 @@ public class Reaction {
    @JoinColumn(name = "comment_id")
    private Comment comment;

-    @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "message_id")
-    private Message message;
-
    @CreationTimestamp
    @Column(nullable = false, updatable = false,
            columnDefinition = "DATETIME(6) DEFAULT CURRENT_TIMESTAMP(6)")
--- a/backend/src/main/java/com/openisle/model/ReactionType.java
+++ b/backend/src/main/java/com/openisle/model/ReactionType.java
@@ -6,9 +6,7 @@ package com.openisle.model;
 public enum ReactionType {
    LIKE,
    DISLIKE,
-    SMILE,
    RECOMMEND,
-    CONGRATULATIONS,
    ANGRY,
    FLUSHED,
    STAR_STRUCK,
@@ -28,5 +26,5 @@ public enum ReactionType {
    CHINA,
    USA,
    JAPAN,
-    KOREA,
+    KOREA
 }
--- a/backend/src/main/java/com/openisle/model/Tag.java
+++ b/backend/src/main/java/com/openisle/model/Tag.java
@@ -38,8 +38,8 @@ public class Tag {
    @Column(nullable = false, updatable = false,
            columnDefinition = "DATETIME(6) DEFAULT CURRENT_TIMESTAMP(6)")
    private LocalDateTime createdAt;
-    // 改用redis缓存之后选择立即加载策略
-    @ManyToOne(fetch = FetchType.EAGER)
+
+    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "creator_id")
    private User creator;
 }
--- a/backend/src/main/java/com/openisle/model/User.java
+++ b/backend/src/main/java/com/openisle/model/User.java
@@ -74,12 +74,6 @@ public class User {
            NotificationType.USER_ACTIVITY
    );

-    @ElementCollection(targetClass = NotificationType.class)
-    @CollectionTable(name = "user_disabled_email_notification_types", joinColumns = @JoinColumn(name = "user_id"))
-    @Column(name = "notification_type")
-    @Enumerated(EnumType.STRING)
-    private Set<NotificationType> disabledEmailNotificationTypes = EnumSet.noneOf(NotificationType.class);
-
    @CreationTimestamp
    @Column(nullable = false, updatable = false,
            columnDefinition = "DATETIME(6) DEFAULT CURRENT_TIMESTAMP(6)")
--- a/backend/src/main/java/com/openisle/repository/CategoryRepository.java
+++ b/backend/src/main/java/com/openisle/repository/CategoryRepository.java
@@ -4,10 +4,7 @@ import com.openisle.model.Category;
 import org.springframework.data.jpa.repository.JpaRepository;

 import java.util.List;
-import java.util.Optional;

 public interface CategoryRepository extends JpaRepository<Category, Long> {
    List<Category> findByNameContainingIgnoreCase(String keyword);
-
-    Optional<Category> findByName(String name);
 }
--- a/backend/src/main/java/com/openisle/repository/ChannelRepository.java
+++ b/backend/src/main/java/com/openisle/repository/ChannelRepository.java
@@ -0,0 +1,10 @@
+package com.openisle.repository;
+
+import com.openisle.model.Channel;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface ChannelRepository extends JpaRepository<Channel, Long> {
+    Optional<Channel> findByConversationId(Long conversationId);
+}
--- a/backend/src/main/java/com/openisle/repository/InviteTokenRepository.java
+++ b/backend/src/main/java/com/openisle/repository/InviteTokenRepository.java
@@ -9,8 +9,4 @@ import java.util.Optional;

 public interface InviteTokenRepository extends JpaRepository<InviteToken, String> {
    Optional<InviteToken> findByInviterAndCreatedDate(User inviter, LocalDate createdDate);
-
-    Optional<InviteToken> findByShortToken(String shortToken);
-
-    boolean existsByShortToken(String shortToken);
 }
--- a/backend/src/main/java/com/openisle/repository/MessageConversationRepository.java
+++ b/backend/src/main/java/com/openisle/repository/MessageConversationRepository.java
@@ -1,25 +1,23 @@
 package com.openisle.repository;

 import com.openisle.model.MessageConversation;
-import com.openisle.model.User;
 import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.Query;
-import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;

+import com.openisle.model.User;
+import java.util.List;
+
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.util.Optional;
+import com.openisle.model.User;
 import java.util.List;

@Repository
 public interface MessageConversationRepository extends JpaRepository<MessageConversation, Long> {
-
-    @Query("SELECT c FROM MessageConversation c LEFT JOIN FETCH c.participants p LEFT JOIN FETCH p.user WHERE c.id = :id")
-    java.util.Optional<MessageConversation> findByIdWithParticipantsAndUsers(@Param("id") Long id);
-    @Query("SELECT c FROM MessageConversation c " +
-           "WHERE c.channel = false AND size(c.participants) = 2 " +
-           "AND EXISTS (SELECT 1 FROM c.participants p1 WHERE p1.user = :user1) " +
-           "AND EXISTS (SELECT 1 FROM c.participants p2 WHERE p2.user = :user2) " +
-           "ORDER BY c.createdAt DESC")
-    List<MessageConversation> findConversationsByUsers(@Param("user1") User user1, @Param("user2") User user2);
+    @Query("SELECT c FROM MessageConversation c JOIN c.participants p1 JOIN c.participants p2 WHERE p1.user = :user1 AND p2.user = :user2")
+    Optional<MessageConversation> findConversationByUsers(@Param("user1") User user1, @Param("user2") User user2);
    
    @Query("SELECT DISTINCT c FROM MessageConversation c " +
           "JOIN c.participants p " +
@@ -30,8 +28,4 @@ public interface MessageConversationRepository extends JpaRepository<MessageConv
           "WHERE p.user.id = :userId " +
           "ORDER BY COALESCE(lm.createdAt, c.createdAt) DESC")
    List<MessageConversation> findConversationsByUserIdOrderByLastMessageDesc(@Param("userId") Long userId);
-
-    List<MessageConversation> findByChannelTrue();
-
-    long countByChannelTrue();
-}
+}
--- a/Show More
+++ b/Show More