WIP: p2 plugin

DiunaBI.Infrastructure/Services/JobWorkerService.cs

@@ -142,8 +142,16 @@ public class JobWorkerService : BackgroundService
             else
             {
                 job.Status = JobStatus.Retrying;
-                _logger.LogInformation("JobWorker: Job {JobId} will retry (attempt {RetryCount}/{MaxRetries})",
-                    job.Id, job.RetryCount, job.MaxRetries);
+
+                // Exponential backoff: wait before retrying based on attempt number
+                var backoffDelay = GetBackoffDelay(job.RetryCount);
+
+                _logger.LogInformation("JobWorker: Job {JobId} will retry in {Delay} (attempt {RetryCount}/{MaxRetries})",
+                    job.Id, backoffDelay, job.RetryCount, job.MaxRetries);
+
+                // Wait before marking as pending again
+                await Task.Delay(backoffDelay, stoppingToken);
+                job.Status = JobStatus.Pending;
             }
         }
         finally
@@ -157,4 +165,14 @@ public class JobWorkerService : BackgroundService
         _logger.LogInformation("JobWorker: Stopping service...");
         await base.StopAsync(stoppingToken);
     }
+
+    private static TimeSpan GetBackoffDelay(int retryCount)
+    {
+        return retryCount switch
+        {
+            1 => TimeSpan.FromSeconds(30),  // 1st retry: 30 seconds
+            2 => TimeSpan.FromMinutes(2),   // 2nd retry: 2 minutes
+            _ => TimeSpan.FromMinutes(5)    // 3rd+ retry: 5 minutes
+        };
+    }
 }