Reschedule post notifications using Doctrine

[MAILPOET-2900]

lib/Newsletter/Sending/ScheduledTasksRepository.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace MailPoet\Newsletter\Sending;
+
+use MailPoet\Doctrine\Repository;
+use MailPoet\Entities\NewsletterEntity;
+use MailPoet\Entities\ScheduledTaskEntity;
+use MailPoet\Entities\SendingQueueEntity;
+use MailPoetVendor\Doctrine\ORM\Query\Expr\Join;
+
+/**
+ * @extends Repository<ScheduledTaskEntity>
+ */
+class ScheduledTasksRepository extends Repository {
+  /**
+   * @param NewsletterEntity $newsletter
+   * @return ScheduledTaskEntity[]
+   */
+  public function findByNewsletterAndStatus(NewsletterEntity $newsletter, string $status): array {
+    return $this->doctrineRepository->createQueryBuilder('st')
+      ->select('st')
+      ->join(SendingQueueEntity::class, 'sq', Join::WITH, 'st = sq.task')
+      ->andWhere('st.status = :status')
+      ->andWhere('sq.newsletter = :newsletter')
+      ->setParameter('status', $status)
+      ->setParameter('newsletter', $newsletter)
+      ->getQuery()
+      ->getResult();
+  }
+
+  protected function getEntityClassName() {
+    return ScheduledTaskEntity::class;
+  }
+}