fix: Fixed interface for callbacks and mapped Unknown to no action for queued_at

src/Contracts/ClusterWithCallbacks.php

@@ -8,7 +8,7 @@ use Dterumal\LaravelCluster\Storage\JobModel;
 
 interface ClusterWithCallbacks
 {
-    public function onFailure(JobModel $clusterJob, \Throwable $e): void;
+    public function onFailure(JobModel $clusterJob): void;
 
     public function onSuccess(JobModel $clusterJob): void;
 

src/Repositories/DatabaseJobRepository.php

@@ -44,10 +44,12 @@ class DatabaseJobRepository implements JobRepository
      */
     public function queued(JobModel $clusterJob, string $datetime): void
     {
+        if ($datetime !== 'Unknown') {
             $clusterJob->update([
                 'queued_at' => $datetime
             ]);
         }
+    }
 
     /**
      * Mark the job as failed