diff --git a/app/Models/Post.php b/app/Models/Post.php
index 338a2478..4d770ca0 100644
--- a/app/Models/Post.php
+++ b/app/Models/Post.php
@@ -4,15 +4,18 @@
 
 namespace App\Models;
 
+use App\DataTransferObjects\MediaItem;
 use App\Enums\Post\Status as PostStatus;
 use Database\Factories\PostFactory;
 use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Concerns\HasUuids;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Support\Collection;
 
 class Post extends Model
 {
@@ -22,8 +25,9 @@ class Post extends Model
     protected $fillable = [
         'workspace_id',
         'user_id',
+        'content',
+        'media',
         'status',
-        'synced',
         'scheduled_at',
         'published_at',
     ];
@@ -32,12 +36,24 @@ protected function casts(): array
     {
         return [
             'status' => PostStatus::class,
-            'synced' => 'boolean',
+            'media' => 'array',
             'scheduled_at' => 'datetime',
             'published_at' => 'datetime',
         ];
     }
 
+    /**
+     * Get media items as a collection of MediaItem DTOs.
+     *
+     * @return Collection<int, MediaItem>
+     */
+    protected function mediaItems(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => collect($this->media ?? [])->map(fn (array $item) => MediaItem::fromArray($item)),
+        );
+    }
+
     public function workspace(): BelongsTo
     {
         return $this->belongsTo(Workspace::class);
@@ -53,6 +69,11 @@ public function postPlatforms(): HasMany
         return $this->hasMany(PostPlatform::class);
     }
 
+    public function comments(): HasMany
+    {
+        return $this->hasMany(PostComment::class);
+    }
+
     public function labels(): BelongsToMany
     {
         return $this->belongsToMany(WorkspaceLabel::class);
diff --git a/app/Models/PostComment.php b/app/Models/PostComment.php
new file mode 100644
index 00000000..feec1498
--- /dev/null
+++ b/app/Models/PostComment.php
@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use Database\Factories\PostCommentFactory;
+use Illuminate\Database\Eloquent\Concerns\HasUuids;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class PostComment extends Model
+{
+    /** @use HasFactory<PostCommentFactory> */
+    use HasFactory, HasUuids;
+
+    protected $fillable = [
+        'post_id',
+        'user_id',
+        'parent_id',
+        'body',
+        'reactions',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'reactions' => 'array',
+        ];
+    }
+
+    public function post(): BelongsTo
+    {
+        return $this->belongsTo(Post::class);
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function parent(): BelongsTo
+    {
+        return $this->belongsTo(self::class, 'parent_id');
+    }
+
+    public function replies(): HasMany
+    {
+        return $this->hasMany(self::class, 'parent_id')->oldest();
+    }
+
+    public function addReaction(string $userId, string $emoji): void
+    {
+        $reactions = $this->reactions ?? [];
+        $reactions = array_filter($reactions, fn (array $r) => ! (data_get($r, 'user_id') === $userId && data_get($r, 'emoji') === $emoji));
+
+        if (count($reactions) === count($this->reactions ?? [])) {
+            $reactions[] = ['user_id' => $userId, 'emoji' => $emoji];
+        }
+
+        $this->update(['reactions' => array_values($reactions)]);
+    }
+}
diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index cd538b29..669a4316 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -12,6 +12,7 @@
 use App\Models\NotificationPreference;
 use App\Models\Plan;
 use App\Models\Post;
+use App\Models\PostComment;
 use App\Models\PostPlatform;
 use App\Models\SocialAccount;
 use App\Models\Subscription;
@@ -95,6 +96,7 @@ protected function configureMorphMap(): void
             'plan' => Plan::class,
             'notificationPreference' => NotificationPreference::class,
             'post' => Post::class,
+            'postComment' => PostComment::class,
             'postPlatform' => PostPlatform::class,
             'socialAccount' => SocialAccount::class,
             'subscription' => Subscription::class,
diff --git a/database/factories/PostCommentFactory.php b/database/factories/PostCommentFactory.php
new file mode 100644
index 00000000..5b0cf426
--- /dev/null
+++ b/database/factories/PostCommentFactory.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Database\Factories;
+
+use App\Models\Post;
+use App\Models\PostComment;
+use App\Models\User;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/** @extends Factory<PostComment> */
+class PostCommentFactory extends Factory
+{
+    public function definition(): array
+    {
+        return [
+            'post_id' => Post::factory(),
+            'user_id' => User::factory(),
+            'body' => $this->faker->sentence(),
+            'reactions' => [],
+        ];
+    }
+
+    public function reply(PostComment $parent): static
+    {
+        return $this->state(fn () => [
+            'post_id' => $parent->post_id,
+            'parent_id' => $parent->id,
+        ]);
+    }
+}
diff --git a/database/migrations/2026_04_15_000001_create_post_comments_table.php b/database/migrations/2026_04_15_000001_create_post_comments_table.php
new file mode 100644
index 00000000..ee7769e7
--- /dev/null
+++ b/database/migrations/2026_04_15_000001_create_post_comments_table.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+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('post_comments', function (Blueprint $table) {
+            $table->uuid('id')->primary();
+            $table->uuid('post_id');
+            $table->uuid('user_id')->nullable();
+            $table->uuid('parent_id')->nullable();
+            $table->text('body');
+            $table->json('reactions')->default('[]');
+            $table->timestamps();
+
+            $table->foreign('post_id')->references('id')->on('posts')->cascadeOnDelete();
+            $table->foreign('user_id')->references('id')->on('users')->nullOnDelete();
+
+            $table->index(['post_id', 'created_at']);
+        });
+
+        Schema::table('post_comments', function (Blueprint $table) {
+            $table->foreign('parent_id')->references('id')->on('post_comments')->cascadeOnDelete();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('post_comments');
+    }
+};