server: Use BackwardsSynchronizerTask on SQSSeederTask

server/app/com/xsn/explorer/tasks/SQSSeederTask.scala

@@ -22,7 +22,8 @@ import scala.util.{Failure, Success}
 class SQSSeederTask @Inject() (
     config: SeederConfig,
     blockEventsProcessor: BlockEventsProcessor,
-    firstBlockSynchronizerTask: FirstBlockSynchronizerTask)(
+    firstBlockSynchronizerTask: FirstBlockSynchronizerTask,
+    backwardsSynchronizerTask: BackwardsSynchronizerTask)(
     implicit sqs: AmazonSQSAsync,
     materializer: Materializer) {
 
@@ -86,16 +87,20 @@ class SQSSeederTask @Inject() (
   }
 
   private def onBlockResult(eventResult: BlockEventsProcessor.Result) = eventResult match {
-    case BlockEventsProcessor.FirstBlockCreated(block) =>
+    case BlockEventsProcessor.FirstBlockCreated(_) =>
       firstBlockSynchronizerTask.sync()
 
-    case BlockEventsProcessor.NewBlockAppended(block) =>
+    case BlockEventsProcessor.NewBlockAppended(_) =>
       firstBlockSynchronizerTask.sync()
 
-    case BlockEventsProcessor.RechainDone(orphanBlock, newBlock) =>
+    case BlockEventsProcessor.RechainDone(_, newBlock) =>
       firstBlockSynchronizerTask.sync()
+      backwardsSynchronizerTask.sync(newBlock)
 
-    case BlockEventsProcessor.MissingBlockProcessed(block) => ()
-    case BlockEventsProcessor.ExistingBlockIgnored(block) => ()
+    case BlockEventsProcessor.MissingBlockProcessed(block) =>
+      backwardsSynchronizerTask.sync(block)
+
+    case BlockEventsProcessor.ExistingBlockIgnored(block) =>
+      backwardsSynchronizerTask.sync(block)
   }
 }