Ship production optimization M1-M12.5A: queues, metrics, HTTP observability, and vector search reliability.

Keep similar-ai from tripping the global circuit on a lone URL 502, clamp Qdrant search to 100, and add Server-Timing plus slow-request logging. Studio shared props, Academy S3 exists caching, heat chunking, and Redis/scheduler hygiene stay in this rollout.

app/Services/LeaderboardService.php

@@ -5,8 +5,8 @@ declare(strict_types=1);
 namespace App\Services;
 
 use App\Models\Artwork;
-use App\Models\ArtworkMetricSnapshotHourly;
 use App\Models\Group;
+use App\Services\Metrics\ArtworkHourlySnapshotWindow;
 use App\Models\Leaderboard;
 use App\Models\Story;
 use App\Models\StoryLike;
@@ -28,6 +28,7 @@ class LeaderboardService
 
     public function __construct(
         private readonly GroupReputationService $groupReputation,
+        private readonly ArtworkHourlySnapshotWindow $snapshotWindow,
     ) {
     }
 
@@ -835,29 +836,7 @@ class LeaderboardService
 
     private function artworkSnapshotDeltas(CarbonImmutable $start): \Illuminate\Database\Query\Builder
     {
-        return ArtworkMetricSnapshotHourly::query()
-            ->from('artwork_metric_snapshots_hourly as snapshots')
-            ->where('snapshots.bucket_hour', '>=', $start)
-            ->select([
-                'snapshots.artwork_id',
-                DB::raw($this->nonNegativeSnapshotDelta('views_count', 'views_delta')),
-                DB::raw($this->nonNegativeSnapshotDelta('downloads_count', 'downloads_delta')),
-                DB::raw($this->nonNegativeSnapshotDelta('favourites_count', 'favourites_delta')),
-                DB::raw($this->nonNegativeSnapshotDelta('comments_count', 'comments_delta')),
-            ])
-            ->groupBy('snapshots.artwork_id')
-            ->toBase();
-    }
-
-    private function nonNegativeSnapshotDelta(string $column, string $alias): string
-    {
-        $delta = sprintf('MAX(snapshots.%1$s) - MIN(snapshots.%1$s)', $column);
-
-        if (DB::connection()->getDriverName() === 'sqlite') {
-            return sprintf('CASE WHEN %1$s > 0 THEN %1$s ELSE 0 END as %2$s', $delta, $alias);
-        }
-
-        return sprintf('GREATEST(%s, 0) as %s', $delta, $alias);
+        return $this->snapshotWindow->artworkPeriodDeltas($start);
     }
 
     private function creatorEntities(array $ids): array