diff --git a/app/Http/Controllers/Api/V4/OptinController.php b/app/Http/Controllers/Api/V4/OptinController.php
index 77d4543..4c2272f 100644
--- a/app/Http/Controllers/Api/V4/OptinController.php
+++ b/app/Http/Controllers/Api/V4/OptinController.php
@@ -36,7 +36,7 @@ class OptinController extends Controller
         $singleOptin = SingleOptin::query()
             ->where('email', $validatedData['email'])
             ->whereHas('brand', function ($q) use ($service) {
-                $q->where('id', $service->brand->id);
+                $q->whereKey($service->brand->getKey());
             })
             ->firstOrNew();
 
diff --git a/app/Http/Controllers/Bo/AnswerController.php b/app/Http/Controllers/Bo/AnswerController.php
index 074d1a8..aa4ba09 100644
--- a/app/Http/Controllers/Bo/AnswerController.php
+++ b/app/Http/Controllers/Bo/AnswerController.php
@@ -154,6 +154,7 @@ class AnswerController extends Controller
      */
     public function destroy(Question $question, Answer $answer): \Illuminate\Http\RedirectResponse
     {
+        $answer->singleOptins()->detach();
         if ($answer->deleteOrFail()) {
             return redirect()->route('bo.questions.answers.index', $question)
                 ->with('success', trans(
diff --git a/app/Http/Controllers/Bo/SingleOptinController.php b/app/Http/Controllers/Bo/SingleOptinController.php
index f0df41b..29d0f39 100644
--- a/app/Http/Controllers/Bo/SingleOptinController.php
+++ b/app/Http/Controllers/Bo/SingleOptinController.php
@@ -31,11 +31,11 @@ class SingleOptinController extends Controller
         $query = SingleOptin::query()
             ->when(
                 $request->filled('brand'),
-                fn($q) => $q->whereHas('brand', fn($q) => $q->where('id', $request->brand))
+                fn($q) => $q->whereHas('brand', fn($q) => $q->whereKey($request->brand)),
             )
             ->when(
                 $request->filled('answer'),
-                fn($q) => $q->whereHas('answers', fn($q) => $q->where('id', $request->answer))
+                fn($q) => $q->whereHas('answers', fn($q) => $q->whereKey($request->answer)),
             );
 
         if ($request->filled('search')) {
@@ -57,7 +57,7 @@ class SingleOptinController extends Controller
             $questionModels = Question::getAllModelsFromBrand($request->brand);
 
             if ($request->filled('question')) {
-                $answerModels = Answer::getAllModelsFromQuestion($request->question);
+                $answerModels = Answer::getAllAnswersFromQuestion($request->question);
             }
         }
 
@@ -78,6 +78,7 @@ class SingleOptinController extends Controller
      */
     public function destroy(SingleOptin $singleoptin): \Illuminate\Http\RedirectResponse
     {
+        $singleoptin->answers()->detach();
         if ($singleoptin->deleteOrFail()) {
             return redirect()->route('bo.single_optins.index')
                 ->with('success', trans(
diff --git a/app/Http/Middleware/Authenticate.php b/app/Http/Middleware/Authenticate.php
index a9aa087..6644383 100644
--- a/app/Http/Middleware/Authenticate.php
+++ b/app/Http/Middleware/Authenticate.php
@@ -31,7 +31,7 @@ class Authenticate extends Middleware
                     }
                 }
             }
-            return route('login');
+            return route('bo.login');
         }
 
         return null;
diff --git a/app/Models/Answer.php b/app/Models/Answer.php
index ff9fc2c..b2ac2ef 100644
--- a/app/Models/Answer.php
+++ b/app/Models/Answer.php
@@ -49,19 +49,6 @@ class Answer extends Model
 
     // * METHODS
 
-    /**
-     * Get all answers associated to the band.
-     *
-     * @param integer $questionModelKey
-     * @return \Illuminate\Database\Eloquent\Collection
-     */
-    public static function getAllModelsFromQuestion(int $questionModelKey): \Illuminate\Database\Eloquent\Collection
-    {
-        return self::getAnswers()->filter(
-            fn($model) => $model->question->getKey() === $questionModelKey
-        )->values();
-    }
-
     /**
      * Reset all cache elements related to this model.
      *
@@ -72,18 +59,22 @@ class Answer extends Model
     {
         $questionModelKey = $model->question->getKey();
         Cache::forget("question-{$questionModelKey}-answers");
-        self::getAnswers();
+        self::getAllAnswersFromQuestion($questionModelKey);
     }
 
     /**
      * Get all answers.
      *
+     * @param integer $questionModelKey
      * @return \Illuminate\Database\Eloquent\Collection
      */
-    public static function getAnswers(): \Illuminate\Database\Eloquent\Collection
+    public static function getAllAnswersFromQuestion(int $questionModelKey): \Illuminate\Database\Eloquent\Collection
     {
-        return Cache::remember('answers', 86400, function () {
-            return self::query()->orderBy('answer', 'ASC')->get();
+        return Cache::remember("question-{$questionModelKey}-answers", 86400, function () use ($questionModelKey) {
+            return self::query()
+                ->whereHas('question', fn($q) => $q->whereKey($questionModelKey))
+                ->orderBy('answer', 'ASC')
+                ->get();
         });
     }
 
diff --git a/app/Traits/Requests/.gitkeep b/app/Traits/Requests/.gitkeep
deleted file mode 100644
index e69de29..0000000