`webhook_listeners` only supports events with less than 4000 characters payload due to background jobs limitation and may break a request

[ShGKme]

• Ref: Webhooks cannot be executed - background job arguments cannot exceed 4000 characters tables#2132

webhook_listeners creates a background job with a payload from the webhook event.
If the payload is bigger then:

1. Webhook is not created
2. A request creating the event fails

background job arguments cannot exceed 4000 characters

server/apps/webhook_listeners/lib/Listener/WebhooksEventListener.php

Lines 27 to 60 in 72c3793

	class WebhooksEventListener implements IEventListener {
	public function __construct(
	private WebhookListenerMapper $mapper,
	private IJobList $jobList,
	private LoggerInterface $logger,
	private IUserSession $userSession,
	) {
	}
	public function handle(Event $event): void {
	$user = $this->userSession->getUser();
	$webhookListeners = $this->mapper->getByEvent($event::class, $user?->getUID());
	foreach ($webhookListeners as $webhookListener) {
	// TODO add group membership to be able to filter on it
	$data = [
	'event' => $this->serializeEvent($event),
	/* Do not remove 'user' from here, see BackgroundJobs/WebhookCall.php */
	'user' => (is_null($user) ? null : JsonSerializer::serializeUser($user)),
	'time' => time(),
	];
	if ($this->filterMatch($webhookListener->getEventFilter(), $data)) {
	$this->jobList->add(
	WebhookCall::class,
	[
	$data,
	$webhookListener->getId(),
	/* Random string to avoid collision with another job with the same parameters */
	bin2hex(random_bytes(5)),
	]
	);
	}
	}
	}

Intermediate solution: at least wrap it into a try catch block and log the error, so failed background job creation doesn't fail the request.

A proper solution is to store the data somewhere else or add support for large data in background jobs.

cc @come-nc @artonge

[uma-1510]

Hey, is this issue still open? I want to work on this issue. can you assign it to me?