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.

database/migrations/2026_08_23_120000_drop_duplicate_artwork_metric_snapshot_index.php

@@ -0,0 +1,71 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * M10 — proposed production schema change. Do not run on production until
+ * a dedicated deploy window. idx_artwork_bucket is an exact duplicate of
+ * UNIQUE uq_artwork_bucket (artwork_id, bucket_hour).
+ *
+ * idx_bucket_hour is a left prefix of idx_bucket_artwork and is documented
+ * as a later candidate only — not dropped here.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        if (! Schema::hasTable('artwork_metric_snapshots_hourly')) {
+            return;
+        }
+
+        if (! $this->indexExists('artwork_metric_snapshots_hourly', 'idx_artwork_bucket')) {
+            return;
+        }
+
+        Schema::table('artwork_metric_snapshots_hourly', function (Blueprint $table) {
+            $table->dropIndex('idx_artwork_bucket');
+        });
+    }
+
+    public function down(): void
+    {
+        if (! Schema::hasTable('artwork_metric_snapshots_hourly')) {
+            return;
+        }
+
+        if ($this->indexExists('artwork_metric_snapshots_hourly', 'idx_artwork_bucket')) {
+            return;
+        }
+
+        Schema::table('artwork_metric_snapshots_hourly', function (Blueprint $table) {
+            $table->index(['artwork_id', 'bucket_hour'], 'idx_artwork_bucket');
+        });
+    }
+
+    private function indexExists(string $table, string $indexName): bool
+    {
+        if (DB::getDriverName() === 'sqlite') {
+            $indexes = DB::select("PRAGMA index_list({$table})");
+
+            foreach ($indexes as $index) {
+                if (($index->name ?? '') === $indexName) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        $database = Schema::getConnection()->getDatabaseName();
+        $row = DB::selectOne(
+            'SELECT COUNT(*) AS c FROM information_schema.statistics
+             WHERE table_schema = ? AND table_name = ? AND index_name = ?',
+            [$database, $table, $indexName]
+        );
+
+        return (int) ($row->c ?? 0) > 0;
+    }
+};