add user entity

backend/app/User/CreateUserDto.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace App\User;
+
+use App\Shared\ValueObject\EmailAddress;
+
+final readonly class CreateUserDto
+{
+    public function __construct(
+        public EmailAddress $email,
+    ) {}
+}

backend/app/User/EloquentUserRepository.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\User;
+
+use App\Shared\ValueObject\EmailAddress;
+
+class EloquentUserRepository implements UserRepository
+{
+    public function create(CreateUserDto $dto): User
+    {
+        $model = UserModel::create([
+            'email' => $dto->email->value(),
+        ]);
+
+        return $this->toDomain($model);
+    }
+
+    public function find(int $id): ?User
+    {
+        $model = UserModel::find($id);
+        if ($model === null) {
+            return null;
+        }
+
+        return $this->toDomain($model);
+    }
+
+    private function toDomain(UserModel $model): User
+    {
+        return new User(
+            id: $model->id,
+            email: new EmailAddress($model->email),
+        );
+    }
+}

backend/app/User/User.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\User;
+
+use App\Shared\ValueObject\EmailAddress;
+
+final readonly class User
+{
+    public function __construct(
+        private int $id,
+        private EmailAddress $email,
+    ) {}
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    public function getEmail(): EmailAddress
+    {
+        return $this->email;
+    }
+}

backend/app/User/UserModel.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\User;
+
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @property int $id
+ * @property string $email
+ *
+ * @method static Builder<static>|UserModel newModelQuery()
+ * @method static Builder<static>|UserModel newQuery()
+ * @method static Builder<static>|UserModel query()
+ *
+ * @mixin \Eloquent
+ */
+#[Fillable(['email'])]
+class UserModel extends Model
+{
+    protected $table = 'users';
+
+    public $timestamps = false;
+}

backend/app/User/UserRepository.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\User;
+
+interface UserRepository
+{
+    public function create(CreateUserDto $dto): User;
+
+    public function find(int $id): ?User;
+}