update rm deadcode

app/Integrations/Whmcs/Support/SlugUniquifier.php

@@ -5,7 +5,6 @@ namespace App\Integrations\Whmcs\Support;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Str;
 
-/** Slugifies a candidate and appends -N until it's unique in the given column, excluding the row's own legacy_id. */
 class SlugUniquifier
 {
     public function unique(string $table, string $column, string $candidate, int $legacyId): string
@@ -14,10 +13,27 @@ class SlugUniquifier
         $slug = $base;
         $suffix = 1;
 
-        while (DB::table($table)->where($column, $slug)->where('legacy_id', '!=', $legacyId)->exists()) {
+        while ($this->ownedByAnotherRow($table, $column, $slug, $legacyId)) {
             $slug = "{$base}-" . ++$suffix;
         }
 
         return $slug;
     }
+
+    public function adoptableId(string $table, string $column, string $candidate): ?int
+    {
+        $slug = Str::slug($candidate) ?: 'item';
+
+        return DB::table($table)->where($column, $slug)->whereNull('legacy_id')->value('id');
+    }
+
+    private function ownedByAnotherRow(string $table, string $column, string $slug, int $legacyId): bool
+    {
+        return DB::table($table)
+            ->where($column, $slug)
+            ->where(function ($query) use ($legacyId) {
+                $query->whereNull('legacy_id')->orWhere('legacy_id', '!=', $legacyId);
+            })
+            ->exists();
+    }
 }