fixup! feat(activity): add bulk activity option

Author: miaulalala

lib/Data.php

@@ -100,7 +100,7 @@ public function send(IEvent $event): int {
 	 *
 	 * @param IEvent $event
 	 * @param array $affectedUsers
-	 * @return list<array<int, mixed>>
+	 * @return list<array<int, string>>
 	 * @throws Exception
 	 */
 	public function bulkSend(IEvent $event, array $affectedUsers): array {
@@ -146,7 +146,7 @@ public function bulkSend(IEvent $event, array $affectedUsers): array {
 			foreach ($affectedUsers as $affectedUser) {
 				$qb->setParameter('affecteduser', $affectedUser);
 				$qb->executeStatement();
-				$activityIds[] = [$qb->getLastInsertId() => $affectedUser];
+				$activityIds[] = [$qb->getLastInsertId() => (string)$affectedUser];
 			}
 
 			$this->connection->commit();