Pin a restore point and keep a note on it

Both live in the catalog on the location, so a new server sees them; the database holds
a local copy for the lists. The retention policy leaves a pinned restore point alone and
does not count it. Available on the restore page and as occ backup:pin and backup:note.

lib/Command/Note.php

@@ -0,0 +1,44 @@
+<?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\PruneService;
+use OCA\NgBackup\Service\TargetService;
+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 Note extends Command {
+	public function __construct(
+		private TargetService $targets,
+		private PruneService $prune,
+	) {
+		parent::__construct();
+	}
+
+	protected function configure(): void {
+		$this->setName('backup:note')
+			->setDescription('Set or remove the note on a snapshot')
+			->addArgument('target', InputArgument::REQUIRED, 'Location name or id')
+			->addArgument('snapshot', InputArgument::REQUIRED, 'Snapshot id (see backup:list)')
+			->addArgument('note', InputArgument::OPTIONAL, 'The note, at most ' . PruneService::NOTE_MAX . ' characters; without it the note is removed', '');
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		$note = (string)$input->getArgument('note');
+		try {
+			$this->prune->setNote($this->targets->get($input->getArgument('target')), $input->getArgument('snapshot'), $note);
+		} catch (\Throwable $e) {
+			$output->writeln('<error>' . $e->getMessage() . '</error>');
+			return 1;
+		}
+		$output->writeln(trim($note) === '' ? 'Note removed.' : 'Note saved.');
+		return 0;
+	}
+}