add postgres user repository

backend/app/User/PostgresUserRepository.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\User;
+
+use App\Database\UserModel;
+use App\Shared\ValueObject\EmailAddress;
+
+class PostgresUserRepository implements UserRepository
+{
+    public function create(CreateUserDto $dto): User
+    {
+        $record = UserModel::create([
+            'email' => $dto->email->value(),
+            'password_hash' => $dto->passwordHash,
+        ]);
+
+        return new User(
+            id: $record->id,
+            email: new EmailAddress($record->email),
+            passwordHash: $record->password_hash,
+        );
+    }
+
+    public function findByEmail(EmailAddress $email): ?User
+    {
+        $record = UserModel::where('email', $email->value())->first();
+
+        if ($record === null) {
+            return null;
+        }
+
+        return new User(
+            id: $record->id,
+            email: new EmailAddress($record->email),
+            passwordHash: $record->password_hash,
+        );
+    }
+
+    public function find(int $id): ?User
+    {
+        $record = UserModel::find($id);
+
+        if ($record === null) {
+            return null;
+        }
+
+        return new User(
+            id: $record->id,
+            email: new EmailAddress($record->email),
+            passwordHash: $record->password_hash,
+        );
+    }
+}