暂存

app/process/AiMetadata.php

@@ -29,6 +29,7 @@ class AiMetadata
             $this->queue->releaseDueDelayed();
             $archiveUid = $this->queue->pop($this->queue->blockTimeout());
             if ($archiveUid === null) {
+                sleep($this->queue->idleSleepSeconds());
                 continue;
             }
 

app/service/AiMetadataQueue.php

@@ -62,6 +62,11 @@ class AiMetadataQueue
         return (int) config('queue.ai_metadata.block_timeout', 5);
     }
 
+    public function idleSleepSeconds(): int
+    {
+        return max(1, (int) config('queue.ai_metadata.idle_sleep_seconds', 1));
+    }
+
     private function pendingKey(): string
     {
         return config('queue.ai_metadata.pending', 'proofdb:ai:metadata:pending');