add persisted set ordering

backend/app/Set/EloquentSetRepository.php

@@ -3,6 +3,7 @@
 namespace App\Set;
 
 use DomainException;
+use Illuminate\Support\Facades\DB;
 
 class EloquentSetRepository implements SetRepository
 {
@@ -12,6 +13,7 @@ class EloquentSetRepository implements SetRepository
             'name' => $dto->name,
             'description' => $dto->description,
             'icon_image_url' => $dto->iconImageUrl,
+            'sort_order' => $this->nextSortOrder(),
         ]);
 
         return $this->toDomain($model);
@@ -55,7 +57,7 @@ class EloquentSetRepository implements SetRepository
 
     public function getAll(): array
     {
-        $models = SetModel::orderBy('id')->get();
+        $models = SetModel::orderBy('sort_order')->orderBy('id')->get();
         $sets = [];
         foreach ($models as $model) {
             $sets[] = $this->toDomain($model);
@@ -64,6 +66,30 @@ class EloquentSetRepository implements SetRepository
         return $sets;
     }
 
+    public function reorder(array $setIds): array
+    {
+        DB::transaction(function () use ($setIds): void {
+            $sortOrder = 1;
+            foreach ($setIds as $setId) {
+                SetModel::where('id', $setId)
+                    ->update(['sort_order' => $sortOrder]);
+                $sortOrder++;
+            }
+        });
+
+        return $this->getAll();
+    }
+
+    private function nextSortOrder(): int
+    {
+        $currentMaxSortOrder = SetModel::max('sort_order');
+        if ($currentMaxSortOrder === null) {
+            return 1;
+        }
+
+        return (int) $currentMaxSortOrder + 1;
+    }
+
     private function toDomain(SetModel $model): Set
     {
         return new Set(