diff --git a/app/Services/Pacs/Sync/StudiesSync.php b/app/Services/Pacs/Sync/StudiesSync.php
index 6847baa..fd4659a 100644
--- a/app/Services/Pacs/Sync/StudiesSync.php
+++ b/app/Services/Pacs/Sync/StudiesSync.php
@@ -15,8 +15,9 @@
 use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\Log;
 
-class StudiesSync
+final class StudiesSync
 {
+    public const string SYNC_AGENT = '$$_pacs_agent_$$';
     private Collection $study_ids;
 
     private Collection $insert_queue;
diff --git a/app/helpers.php b/app/helpers.php
index e64f49e..5cb6e17 100644
--- a/app/helpers.php
+++ b/app/helpers.php
@@ -3,6 +3,7 @@
 use App\Models\Study;
 use App\Models\User;
 use App\Services\AuditTrail\ActivityLogger;
+use App\Services\Pacs\Sync\StudiesSync;
 use Illuminate\Support\Str;
 use Spatie\MediaLibrary\MediaCollections\Models\Media;
 
@@ -52,7 +53,7 @@ function array_trim_strings(array $ary): array
     function sync_agent_id(): int
     {
         return cache()->rememberForever('sync_agent_id',
-            fn () => User::where('username', '$$_pacs_sync_$$')->first()->id);
+            fn () => User::where('username', StudiesSync::SYNC_AGENT)->first()->id);
     }
 }
 
diff --git a/database/seeders/UserSeeder.php b/database/seeders/UserSeeder.php
index bed382f..d484c41 100644
--- a/database/seeders/UserSeeder.php
+++ b/database/seeders/UserSeeder.php
@@ -6,6 +6,7 @@
 use App\Models\Department;
 use App\Models\Organization;
 use App\Models\User;
+use App\Services\Pacs\Sync\StudiesSync;
 use Illuminate\Database\Seeder;
 
 class UserSeeder extends Seeder
@@ -17,7 +18,7 @@ public function run(): void
         $usr = User::factory()->create([
             'first_name' => 'PACS Agent',
             'display_name' => 'PACS Agent',
-            'username' => '$$_pacs_agent_$$',
+            'username' => StudiesSync::SYNC_AGENT,
             'password' => bcrypt(fake()->password(20)),
             'is_active' => false,
         ]);