Allow artworks to have one primary category and extra secondaries.

Keep artwork_category as membership, store a deterministic primary_category_id, and let upload plus studio pick up to five additional same-type categories without changing canonical URLs.

app/Jobs/IngestUserDiscoveryEventJob.php

@@ -4,8 +4,8 @@ declare(strict_types=1);
 
 namespace App\Jobs;
 
-use App\Services\Recommendations\UserInterestProfileService;
 use App\Services\Recommendations\SessionRecoService;
+use App\Services\Recommendations\UserInterestProfileService;
 use Carbon\CarbonImmutable;
 use Illuminate\Bus\Queueable;
 use Illuminate\Contracts\Queue\ShouldQueue;
@@ -30,7 +30,7 @@ final class IngestUserDiscoveryEventJob implements ShouldQueue
     public array $backoff = [5, 30, 120];
 
     /**
-     * @param array<string, mixed> $meta
+     * @param  array<string, mixed>  $meta
      */
     public function __construct(
         public readonly string $eventId,
@@ -40,8 +40,7 @@ final class IngestUserDiscoveryEventJob implements ShouldQueue
         public readonly string $algoVersion,
         public readonly string $occurredAt,
         public readonly array $meta = []
-    ) {
-    }
+    ) {}
 
     public function handle(UserInterestProfileService $profileService, SessionRecoService $sessionRecoService): void
     {
@@ -70,10 +69,9 @@ final class IngestUserDiscoveryEventJob implements ShouldQueue
             $eventVersion = (string) config('discovery.event_version', 'event-v1');
             $eventWeight = (float) ((array) config('discovery.weights', []))[$this->eventType] ?? 1.0;
 
-            $categoryId = DB::table('artwork_category')
-                ->where('artwork_id', $this->artworkId)
-                ->orderBy('category_id')
-                ->value('category_id');
+            $categoryId = DB::table('artworks')
+                ->where('id', $this->artworkId)
+                ->value('primary_category_id');
 
             $insertPayload = [
                 'event_id' => $this->eventId,