Heavy background jobs of other apps pause while a backup runs

Reserved in Nextcloud's job list, so no app is turned off and a job that is running goes on.
At most 6 hours in a row, then they get an hour; Nextcloud ends a reservation by itself after
12 hours, should the end of a pause never come. On by default, with a setting to turn it off.

lib/Command/PauseJobs.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+// SPDX-FileCopyrightText: 2026 Dillard Blom
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+namespace OCA\NgBackup\Command;
+
+use OCA\NgBackup\Service\HeavyJobPause;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+final class PauseJobs extends Command {
+	public function __construct(
+		private HeavyJobPause $pause,
+	) {
+		parent::__construct();
+	}
+
+	protected function configure(): void {
+		$this->setName('backup:pause-jobs')
+			->setDescription('Show or set whether heavy background jobs (Memories, Recognize, Preview Generator, ...) pause while a backup runs')
+			->addArgument('setting', InputArgument::OPTIONAL, '"on" or "off"; omit to show the current one');
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		$setting = $input->getArgument('setting');
+		if ($setting !== null) {
+			if ($setting !== 'on' && $setting !== 'off') {
+				$output->writeln('<error>Use "on" or "off".</error>');
+				return 1;
+			}
+			$this->pause->setEnabled($setting === 'on');
+		}
+		$status = $this->pause->status();
+		$output->writeln('Pausing heavy background jobs during a backup: ' . ($status['enabled'] ? 'on' : 'off'));
+		if ($status['jobs'] !== []) {
+			$output->writeln('Paused now: ' . implode(', ', $status['jobs']));
+		}
+		return 0;
+	}
+}