diff --git a/README.md b/README.md
index a4bf30b..3579822 100644
--- a/README.md
+++ b/README.md
@@ -1,28 +1,41 @@
 # Database Playground
 
-This platform allows you to exercise your SQL skills through a simple gamification system.
+The Database Playground is a platform designed to enhance your SQL skills through an engaging gamification system.
 
 ## Development
 
 ### Preparation
 
-- Use PhpStorm for PHP and Twig development, and VS Code for TypeScript development.
-- [Devenv](https://devenv.sh) provides the development environment, including pre-commit hooks, PHP, and Node.js runtimes.
-- [Docker Compose](https://docs.docker.com/compose/) sets up the development runtime environment.
+- Use **PhpStorm** for PHP and Twig development, and **VS Code** for TypeScript development.
+- **Devenv** provides a comprehensive development environment, including pre-commit hooks and runtimes for PHP and
+  Node.js. Learn more at [Devenv](https://devenv.sh).
+- **Docker Compose** is utilized to set up the development runtime environment. For more details, visit
+  the [Docker Compose documentation](https://docs.docker.com/compose/).
 
 ### Setup
 
 1. Clone the repository.
 2. Run `devenv up` to start the development environment.
-3. Execute `composer install` to install the PHP dependencies.
-4. Run `pnpm install` to install the Node.js dependencies. This step is optional but helpful if you prefer type declarations when developing TypeScript.
-5. Start the database, Redis, and PHP runtime by running `docker compose up -d`.
-6. Create an administrator user with the command: `php ./bin/console app:create-user -p "yourpassword" -r "ROLE_ADMIN" "admin" "admin@youremail.tld"`.
-7. (Optional) Import the schema and questions by running `php ./bin/console app:import schema.json`.
-8. Navigate to `https://localhost` to access the application. Use `https://localhost/admin` to access the admin panel.
+3. Execute `composer install` to install PHP dependencies.
+4. Run `pnpm install` to install Node.js dependencies, which is useful for type checking.
+5. Start the database, Redis, and PHP runtime for development:
+   ```bash
+   docker compose up -d
+   ```
+6. Create an administrator user by running:
+   ```bash
+   php ./bin/console app:create-user -p "yourpassword" -r "ROLE_ADMIN" "admin" "admin@youremail.tld"
+   ```
+7. (Optional) Import the schema and questions using:
+   ```bash
+   php ./bin/console app:import schema.json
+   ```
+8. Access the application at `https://localhost`, and use `https://localhost/admin` to access the admin panel.
 
 ## Deployment
 
+### Zeabur
+
 1. Deploy Redis, PostgreSQL, Meilisearch, and Umami (for statistics) on Zeabur.
 2. Deploy the application in Git mode on Zeabur.
 3. Add the following environment variables to the application:
@@ -32,9 +45,26 @@ This platform allows you to exercise your SQL skills through a simple gamificati
    APP_SECRET=${PASSWORD}
    MEILISEARCH_URL=http://meilisearch.zeabur.internal:7700
    MEILISEARCH_API_KEY=${MEILI_MASTER_KEY}
+   UMAMI_DOMAIN=your-umami-domain.tld
+   UMAMI_WEBSITE_ID=your-website-id
+   OPENAI_API_KEY=your-openai-api-key
+   LINE_NOTIFY_DSN=linenotify://line-notify-token@default
    ```
 4. Create an index in Meilisearch by running:
-   ```
+   ```bash
    php bin/console meili:create --update-settings
    ```
-5. Bind your domain, and it will be ready for use.
+5. Bind your domain, and the application will be ready for use.
+
+### Docker
+
+We provide a Docker Compose configuration based on [Symfony Docker](https://github.com/dunglas/symfony-docker) for
+deployment. The prebuilt image is available at
+the [GitHub Registry](https://github.com/database-playground/app-sf/pkgs/container/app-sf).
+
+To deploy the application, you may need to update the secret or environment variables in the `compose.yaml` and
+`compose.prod.yaml` files, and then run the following command:
+
+```bash
+docker compose -f compose.yaml -f compose.prod.yaml up -d
+```
diff --git a/assets/styles/app.scss b/assets/styles/app.scss
index 94c0a5c..488a971 100644
--- a/assets/styles/app.scss
+++ b/assets/styles/app.scss
@@ -87,6 +87,21 @@ ul.credit {
   list-style: none;
   margin-bottom: 0;
   padding-left: 0;
+
+  &__links {
+    display: inline;
+    list-style: none;
+    padding: 0;
+    margin: 0;
+
+    li {
+      display: inline;
+    }
+
+    li:not(:last-child)::after {
+      content: "｜";
+    }
+  }
 }
 
 // overrides
diff --git a/composer.lock b/composer.lock
index e5c425b..be892a3 100644
--- a/composer.lock
+++ b/composer.lock
@@ -2081,12 +2081,12 @@
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                 "type": "git",
                 "url": "https://github.com/nette/schema.git",
-                "reference": "9522dad6211c4d995a01a9ac529da88d0b0ba7b5"
+                "reference": "d10d6cd21f3b19b337b760693ef09792dddd6c1b"
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-                "reference": "9522dad6211c4d995a01a9ac529da88d0b0ba7b5",
+                "url": "https://api.github.com/repos/nette/schema/zipball/d10d6cd21f3b19b337b760693ef09792dddd6c1b",
+                "reference": "d10d6cd21f3b19b337b760693ef09792dddd6c1b",
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             "require": {
@@ -2133,9 +2133,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nette/schema/issues",
-                "source": "https://github.com/nette/schema/tree/v1.3.1"
+                "source": "https://github.com/nette/schema/tree/v1.3"
             },
-            "time": "2024-10-05T03:01:50+00:00"
+            "time": "2024-10-05T14:49:35+00:00"
         },
         {
             "name": "nette/utils",
@@ -3605,12 +3605,12 @@
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                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "270fd988c707d8d3aeae056de564130d3cd1b2ec"
+                "reference": "23a1a633e4ee488f843cfac61de2f90f0d764c82"
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-                "reference": "270fd988c707d8d3aeae056de564130d3cd1b2ec",
+                "url": "https://api.github.com/repos/symfony/console/zipball/23a1a633e4ee488f843cfac61de2f90f0d764c82",
+                "reference": "23a1a633e4ee488f843cfac61de2f90f0d764c82",
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@@ -3690,7 +3690,7 @@
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-            "time": "2024-10-04T09:00:10+00:00"
+            "time": "2024-10-06T09:25:06+00:00"
         },
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             "name": "symfony/dependency-injection",
@@ -3698,12 +3698,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/dependency-injection.git",
-                "reference": "92db4a73acf0b4f430c2942122207b06a62318dd"
+                "reference": "43bc95c4a56715e59ea470429fea87f1c4b4e500"
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-                "reference": "92db4a73acf0b4f430c2942122207b06a62318dd",
+                "url": "https://api.github.com/repos/symfony/dependency-injection/zipball/43bc95c4a56715e59ea470429fea87f1c4b4e500",
+                "reference": "43bc95c4a56715e59ea470429fea87f1c4b4e500",
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@@ -3770,7 +3770,7 @@
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-            "time": "2024-10-02T06:33:23+00:00"
+            "time": "2024-10-06T09:18:35+00:00"
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             "name": "symfony/deprecation-contracts",
@@ -4626,12 +4626,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/framework-bundle.git",
-                "reference": "a8f57a0a7a3b8ae1bea4032541df9e76414a12ad"
+                "reference": "f1db82a3c4e40c9c751745644eacef83619c5c24"
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-                "reference": "a8f57a0a7a3b8ae1bea4032541df9e76414a12ad",
+                "url": "https://api.github.com/repos/symfony/framework-bundle/zipball/f1db82a3c4e40c9c751745644eacef83619c5c24",
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@@ -4768,7 +4768,7 @@
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-            "time": "2024-10-04T09:59:42+00:00"
+            "time": "2024-10-06T09:01:40+00:00"
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@@ -4776,12 +4776,12 @@
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                 "type": "git",
                 "url": "https://github.com/symfony/http-client.git",
-                "reference": "7f387663bf3d3418d41950a663bf1375960c830c"
+                "reference": "bd4e277e6f367ea8c8d81c28f8df1b02d746a377"
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@@ -4863,7 +4863,7 @@
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+            "time": "2024-10-04T11:58:10+00:00"
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@@ -4950,12 +4950,12 @@
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-                "reference": "d3566cad73eaf474a3654cc5ba437740cf5bf467"
+                "reference": "53b79fbb27e5f847ab89b3f531a9d1440db2a49b"
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@@ -5020,7 +5020,7 @@
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@@ -5377,12 +5377,12 @@
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                 "url": "https://github.com/symfony/mailer.git",
-                "reference": "dd5dff9bfc9f5bf835f0d981bcf078efd0514a2c"
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-                "reference": "dd5dff9bfc9f5bf835f0d981bcf078efd0514a2c",
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@@ -5391,7 +5391,7 @@
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-                "symfony/mime": "^6.4|^7.0",
+                "symfony/mime": "^7.2",
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@@ -5449,7 +5449,7 @@
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-            "time": "2024-09-28T08:24:38+00:00"
+            "time": "2024-10-06T12:00:20+00:00"
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@@ -5544,12 +5544,12 @@
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                 "url": "https://github.com/symfony/mime.git",
-                "reference": "fb617713c2555dffee210650a6b62bdb75fda523"
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@@ -5620,7 +5620,7 @@
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+            "time": "2024-10-06T09:43:34+00:00"
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             "name": "symfony/monolog-bridge",
@@ -6794,12 +6794,12 @@
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                 "url": "https://github.com/symfony/routing.git",
-                "reference": "0aeab4de35fdf7b2dca4f715e4b03b17e8d1a68c"
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@@ -6867,7 +6867,7 @@
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+            "time": "2024-10-03T12:20:01+00:00"
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@@ -7303,12 +7303,12 @@
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                 "type": "git",
                 "url": "https://github.com/symfony/serializer.git",
-                "reference": "a446b06f976732745ed919afad3680f6858b8a7c"
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@@ -7394,7 +7394,7 @@
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-            "time": "2024-09-27T08:40:36+00:00"
+            "time": "2024-10-03T12:20:01+00:00"
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@@ -7486,12 +7486,12 @@
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                 "type": "git",
                 "url": "https://github.com/symfony/stimulus-bundle.git",
-                "reference": "4ad4fad4279817825a369dec236554ce329e1d76"
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@@ -7548,7 +7548,7 @@
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+            "time": "2024-10-05T22:11:16+00:00"
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@@ -7705,12 +7705,12 @@
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                 "url": "https://github.com/symfony/translation.git",
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@@ -7792,7 +7792,7 @@
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@@ -7879,12 +7879,12 @@
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                 "url": "https://github.com/symfony/twig-bridge.git",
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@@ -7981,7 +7981,7 @@
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+            "time": "2024-10-06T09:03:02+00:00"
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@@ -8229,12 +8229,12 @@
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                 "url": "https://github.com/symfony/ux-chartjs.git",
-                "reference": "3a669e28d6665515da4d3117d245650d325212da"
+                "reference": "b2e1bdf52570d4c101015b6a27458e9230c6919a"
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@@ -8286,7 +8286,7 @@
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-                "source": "https://github.com/symfony/ux-chartjs/tree/v2.20.0"
+                "source": "https://github.com/symfony/ux-chartjs/tree/2.x"
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@@ -8302,7 +8302,7 @@
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-            "time": "2024-09-24T09:27:42+00:00"
+            "time": "2024-10-05T22:11:16+00:00"
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@@ -8310,12 +8310,12 @@
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                 "url": "https://github.com/symfony/ux-live-component.git",
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-                "url": "https://api.github.com/repos/symfony/ux-live-component/zipball/c05ac6bfa7368415676d74183eded05be2635a1d",
-                "reference": "c05ac6bfa7368415676d74183eded05be2635a1d",
+                "url": "https://api.github.com/repos/symfony/ux-live-component/zipball/f85e980ca87cca168d178072b24ddede9406b940",
+                "reference": "f85e980ca87cca168d178072b24ddede9406b940",
                 "shasum": ""
             },
             "require": {
@@ -8380,7 +8380,7 @@
                 "twig"
             ],
             "support": {
-                "source": "https://github.com/symfony/ux-live-component/tree/v2.20.0"
+                "source": "https://github.com/symfony/ux-live-component/tree/2.x"
             },
             "funding": [
                 {
@@ -8396,7 +8396,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-09-24T09:27:42+00:00"
+            "time": "2024-10-05T22:11:16+00:00"
         },
         {
             "name": "symfony/ux-turbo",
@@ -8404,12 +8404,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/ux-turbo.git",
-                "reference": "577f34a6d5994778a5a6723686816bac123af16b"
+                "reference": "b7aaa5f0479b22821a1d2e5b0784a297dc6db6f4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/ux-turbo/zipball/577f34a6d5994778a5a6723686816bac123af16b",
-                "reference": "577f34a6d5994778a5a6723686816bac123af16b",
+                "url": "https://api.github.com/repos/symfony/ux-turbo/zipball/b7aaa5f0479b22821a1d2e5b0784a297dc6db6f4",
+                "reference": "b7aaa5f0479b22821a1d2e5b0784a297dc6db6f4",
                 "shasum": ""
             },
             "require": {
@@ -8495,7 +8495,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-10-03T07:25:39+00:00"
+            "time": "2024-10-05T22:11:16+00:00"
         },
         {
             "name": "symfony/ux-twig-component",
@@ -8503,12 +8503,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/ux-twig-component.git",
-                "reference": "81a6f40ff2c67ff704f957dd90c82fa895740f7d"
+                "reference": "5b60b239fffcb04fc8bdb2a5a4001d19442d575d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/ux-twig-component/zipball/81a6f40ff2c67ff704f957dd90c82fa895740f7d",
-                "reference": "81a6f40ff2c67ff704f957dd90c82fa895740f7d",
+                "url": "https://api.github.com/repos/symfony/ux-twig-component/zipball/5b60b239fffcb04fc8bdb2a5a4001d19442d575d",
+                "reference": "5b60b239fffcb04fc8bdb2a5a4001d19442d575d",
                 "shasum": ""
             },
             "require": {
@@ -8579,7 +8579,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-10-02T14:08:03+00:00"
+            "time": "2024-10-05T22:11:16+00:00"
         },
         {
             "name": "symfony/validator",
@@ -8970,12 +8970,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/twbs/bootstrap.git",
-                "reference": "d07536f7f6f5d66da25bbae19b33364356c65245"
+                "reference": "653f8f3cb306a63897e8a626d4948690a53e913b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twbs/bootstrap/zipball/d07536f7f6f5d66da25bbae19b33364356c65245",
-                "reference": "d07536f7f6f5d66da25bbae19b33364356c65245",
+                "url": "https://api.github.com/repos/twbs/bootstrap/zipball/653f8f3cb306a63897e8a626d4948690a53e913b",
+                "reference": "653f8f3cb306a63897e8a626d4948690a53e913b",
                 "shasum": ""
             },
             "replace": {
@@ -9013,7 +9013,7 @@
                 "issues": "https://github.com/twbs/bootstrap/issues",
                 "source": "https://github.com/twbs/bootstrap/tree/main"
             },
-            "time": "2024-10-02T13:28:49+00:00"
+            "time": "2024-10-06T10:35:34+00:00"
         },
         {
             "name": "twig/extra-bundle",
@@ -9569,12 +9569,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer.git",
-                "reference": "46abfa65896913c15e15de97c17095184ecc4dbc"
+                "reference": "6ba531ac83773e5fb5d8b1f258146ee9c88d15ae"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHP-CS-Fixer/PHP-CS-Fixer/zipball/46abfa65896913c15e15de97c17095184ecc4dbc",
-                "reference": "46abfa65896913c15e15de97c17095184ecc4dbc",
+                "url": "https://api.github.com/repos/PHP-CS-Fixer/PHP-CS-Fixer/zipball/6ba531ac83773e5fb5d8b1f258146ee9c88d15ae",
+                "reference": "6ba531ac83773e5fb5d8b1f258146ee9c88d15ae",
                 "shasum": ""
             },
             "require": {
@@ -9665,7 +9665,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-10-02T19:43:05+00:00"
+            "time": "2024-10-05T19:13:51+00:00"
         },
         {
             "name": "masterminds/html5",
@@ -10027,12 +10027,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "393f358af9e2434ad695e000dd33ef2870a761d5"
+                "reference": "c77064a1c8f3b6b29b48ca641c4eea3fc49b3d6a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/393f358af9e2434ad695e000dd33ef2870a761d5",
-                "reference": "393f358af9e2434ad695e000dd33ef2870a761d5",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/c77064a1c8f3b6b29b48ca641c4eea3fc49b3d6a",
+                "reference": "c77064a1c8f3b6b29b48ca641c4eea3fc49b3d6a",
                 "shasum": ""
             },
             "require": {
@@ -10078,7 +10078,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-10-04T12:10:09+00:00"
+            "time": "2024-10-06T14:58:32+00:00"
         },
         {
             "name": "phpstan/phpstan-doctrine",
@@ -10654,12 +10654,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "50d62bd541d80b4ad94ea97b9f56d1e2233e86e4"
+                "reference": "1eef0f96baacb710cb162febc6798741a0ccee34"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/50d62bd541d80b4ad94ea97b9f56d1e2233e86e4",
-                "reference": "50d62bd541d80b4ad94ea97b9f56d1e2233e86e4",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/1eef0f96baacb710cb162febc6798741a0ccee34",
+                "reference": "1eef0f96baacb710cb162febc6798741a0ccee34",
                 "shasum": ""
             },
             "require": {
@@ -10747,7 +10747,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-10-04T14:41:31+00:00"
+            "time": "2024-10-06T11:28:51+00:00"
         },
         {
             "name": "react/cache",
diff --git a/devenv.lock b/devenv.lock
index 3fc4054..2bb95de 100644
--- a/devenv.lock
+++ b/devenv.lock
@@ -3,10 +3,10 @@
     "devenv": {
       "locked": {
         "dir": "src/modules",
-        "lastModified": 1728112965,
+        "lastModified": 1728113618,
         "owner": "cachix",
         "repo": "devenv",
-        "rev": "cc562bf2bd351b475ceffb50c2056e73d0f639ce",
+        "rev": "a8495abab31ce52cd45d343caa760046c0c7ee74",
         "type": "github"
       },
       "original": {
@@ -53,10 +53,10 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1728031656,
+        "lastModified": 1728182355,
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "eeeb90a1dd3c9bea3afdbc76fd34d0fb2a727c7a",
+        "rev": "7d49afd36b5590f023ec56809c02e05d8164fbc4",
         "type": "github"
       },
       "original": {
@@ -68,10 +68,10 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1727907660,
+        "lastModified": 1728193676,
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5966581aa04be7eff830b9e1457d56dc70a0b798",
+        "rev": "ecbc1ca8ffd6aea8372ad16be9ebbb39889e55b6",
         "type": "github"
       },
       "original": {
diff --git a/package.json b/package.json
index c856224..febe968 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "codemirror": "^6.0.1",
     "typescript": "^5.6.2"
   },
-  "packageManager": "pnpm@9.9.0+sha512.60c18acd138bff695d339be6ad13f7e936eea6745660d4cc4a776d5247c540d0edee1a563695c183a66eb917ef88f2b4feb1fc25f32a7adcadc7aaf3438e99c1",
+  "packageManager": "pnpm@9.12.0+sha512.4abf725084d7bcbafbd728bfc7bee61f2f791f977fd87542b3579dcb23504d170d46337945e4c66485cd12d588a0c0e570ed9c477e7ccdd8507cf05f3f92eaca",
   "devDependencies": {
     "@eslint/js": "^9.12.0",
     "@hotwired/stimulus": "^3.2.2",
diff --git a/src/Controller/FeedbackController.php b/src/Controller/FeedbackController.php
index 9a8b7b5..8d1f21f 100644
--- a/src/Controller/FeedbackController.php
+++ b/src/Controller/FeedbackController.php
@@ -23,6 +23,7 @@ public function index(
         EntityManagerInterface $entityManager,
         #[CurrentUser] ?User $user,
         #[MapQueryParameter] string $url,
+        #[MapQueryParameter] ?string $description = null,
     ): Response {
         $feedback = (new Feedback())
             ->setSender($user)
@@ -30,16 +31,22 @@ public function index(
                 'url' => $url,
             ]);
 
+        if (null !== $description) {
+            $feedback->setDescription($description);
+        }
+
         $form = $this->createForm(FeedbackFormType::class, $feedback);
         $form = $form->handleRequest($request);
 
         if ($form->isSubmitted() && $form->isValid()) {
             // add more metadata that does not affect by requests (e.g. user agent)
+            // if we don't know the user, we store the IP address so we can track it.
             $feedback->setMetadata(array_merge(
                 $feedback->getMetadata(),
                 [
                     'user_agent' => $request->headers->get('User-Agent'),
                     'user' => $user?->getUserIdentifier(),
+                    'ip' => null === $user ? $request->getClientIp() : null,
                 ],
             ));
 
diff --git a/templates/bundles/TwigBundle/Exception/error.html.twig b/templates/bundles/TwigBundle/Exception/error.html.twig
index 50e6d79..f966a78 100644
--- a/templates/bundles/TwigBundle/Exception/error.html.twig
+++ b/templates/bundles/TwigBundle/Exception/error.html.twig
@@ -8,14 +8,18 @@
     <h2>系統出錯 😰</h2>
     <p>系統發生 HTTP {{ status_code }} {{ status_text }} 錯誤。</p>
     <p>
-        請聯絡<a href="mailto:dbplay@pan93.com">系統管理員</a>進行修正，並附上下面錯誤資訊的所有內容。
-        如果你想挑戰修正這個問題，下方為相關的堆疊資訊，您可以到 <a href="https://github.com/database-playground/app-sf">GitHub</a>
+        請 <a href="{{ url('app_feedback', {
+            url: app.request.uri,
+            description: "請在這裡撰寫回饋訊息。不要刪到下面的資訊。\n\n---\nException:\n#{exception.message} (#{exception.file}:#{exception.line})\n#{exception.traceAsString}",
+        }) }}">點選這個連結打開回饋表單</a> 進行問題回報。
+        如果你想挑戰修正這個問題，下方為相關的堆疊資訊，您可以到
+        <a href="https://github.com/database-playground/app-sf">GitHub</a>
         上送交修正。
     </p>
 
     <h3>錯誤資訊</h3>
     <p><strong>{{ exception.message }}</strong> ({{ exception.file }}:{{ exception.line }})</p>
     <pre>
-{{ exception.trace|json_encode(constant('JSON_PRETTY_PRINT')) }}
+{{ exception.traceAsString }}
     </pre>
 {% endblock %}
diff --git a/templates/complementary/index.html.twig b/templates/complementary/index.html.twig
index b4ff188..455272e 100644
--- a/templates/complementary/index.html.twig
+++ b/templates/complementary/index.html.twig
@@ -70,12 +70,6 @@
                     題，少的每題扣 {{ constant('\\App\\Service\\PointCalculationService::weeklyPerQuestionXpPoint') }} 分。
                 </li>
             </ul>
-
-            <p>
-                相關計分原始碼可以參考
-                <a href="https://github.com/database-playground/app-sf/blob/master/src/Service/PointCalculationService.php"
-                >GitHub 的對應程式碼</a
-                >。</p>
         </section>
     </main>
 {% endblock %}
diff --git a/templates/components/AppFooter.html.twig b/templates/components/AppFooter.html.twig
index 8a64333..533548c 100644
--- a/templates/components/AppFooter.html.twig
+++ b/templates/components/AppFooter.html.twig
@@ -6,12 +6,12 @@
         <div>
             <ul class="app-footer__links">
                 <li>
-                    <a href="https://github.com/database-playground/app-sf">
+                    <a href="https://github.com/database-playground/app-sf" target="_blank">
                         <i class="bi bi-github"></i> <span>GitHub</span>
                     </a>
                 </li>
                 <li>
-                    <a href="{{ url('app_feedback', {url: app.request.uri}) }}">
+                    <a href="{{ url('app_feedback', {url: app.request.uri}) }}" target="_blank">
                         <i class="bi bi-bug-fill"></i> <span>意見回饋</span>
                     </a>
                 </li>
diff --git a/templates/feedback/index.html.twig b/templates/feedback/index.html.twig
index 3631ff2..35ffca2 100644
--- a/templates/feedback/index.html.twig
+++ b/templates/feedback/index.html.twig
@@ -12,6 +12,12 @@
 
         <turbo-frame id="feedback-form">
         {% if form is not null %}
+            {% if app.user is null %}
+                <div class="alert alert-warning">
+                    因為您沒有登入，我們還會額外記錄 IP 地址，以便追蹤回饋來源。
+                </div>
+            {% endif %}
+
             {{ form(form) }}
 
             <style>
diff --git a/templates/security/login.html.twig b/templates/security/login.html.twig
index db6ce09..89af968 100644
--- a/templates/security/login.html.twig
+++ b/templates/security/login.html.twig
@@ -58,11 +58,19 @@
 
                 <ul class="app-login__form__login-form__operation__credit credit">
                     <li>
-                        <a href="https://github.com/database-playground/app-sf">GitHub</a
-                        >｜<a href="https://uptime.dbplay.pan93.com">服務狀態</a>｜<a href="{{ url('app_feedback', {url: app.request.uri}) }}">
-                            意見回饋
-                        </a></li>
-                    <li>Designed by <a href="https://eclab.nkust.edu.tw/">傅家子弟電商實驗室</a></li>
+                        <ul class="credit__links">
+                            <li>
+                                <a href="https://github.com/database-playground/app-sf" target="_blank">GitHub</a>
+                            </li>
+                            <li>
+                                <a href="https://uptime.dbplay.pan93.com">服務狀態</a>
+                            </li>
+                            <li>
+                                <a href="{{ url('app_feedback', {url: app.request.uri}) }}" target="_blank">意見回饋</a>
+                            </li>
+                        </ul>
+                    </li>
+                    <li>Designed by <a href="https://eclab.nkust.edu.tw/" target="_blank">傅家子弟電商實驗室</a></li>
                 </ul>
             </div>
         </form>