Add bookmarking

app/Models/Bookmark.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Bookmark extends Model
+{
+    use HasFactory;
+
+    public function post(): BelongsTo
+    {
+        return $this->belongsTo(Post::class);
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+}

database/factories/BookmarkFactory.php

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+<?php
+
+namespace Database\Factories;
+
+use App\Models\Bookmark;
+use App\Models\Post;
+use App\Models\User;
+use Illuminate\Database\Eloquent\Factories\Factory;
+use Illuminate\Support\Carbon;
+
+class BookmarkFactory extends Factory
+{
+    protected $model = Bookmark::class;
+
+    public function definition(): array
+    {
+        return [
+            'created_at' => Carbon::now(),
+            'updated_at' => Carbon::now(),
+
+            'post_id' => Post::factory(),
+            'user_id' => User::factory(),
+        ];
+    }
+}

database/migrations/2026_01_09_200634_create_bookmarks_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('bookmarks', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('post_id');
+            $table->foreignId('user_id');
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('bookmarks');
+    }
+};