feat: add context_chat:reindex to re-seed the crawl on demand

appinfo/info.xml

@@ -50,6 +50,7 @@ Refer to the [Context Chat Backend's readme](https://github.com/nextcloud/contex
 		<command>OCA\ContextChat\Command\Prompt</command>
 		<command>OCA\ContextChat\Command\Search</command>
 		<command>OCA\ContextChat\Command\Statistics</command>
+		<command>OCA\ContextChat\Command\Reindex</command>
 	</commands>
     <repair-steps>
         <install>

lib/Command/Reindex.php

@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\ContextChat\Command;
+
+use OCA\ContextChat\BackgroundJobs\SchedulerJob;
+use OCP\BackgroundJob\IJobList;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Re-seed the one-shot filesystem crawl/index on demand.
+ *
+ * SchedulerJob -> StorageCrawlJob -> IndexerJob is seeded only by the <install> repair step and
+ * removes itself once the initial crawl finishes. There is otherwise no way to re-enumerate
+ * mounts (e.g. after installing on an instance whose files predate the app, or to recover a crawl
+ * that did not complete) short of reinstalling the app. This command re-adds SchedulerJob so the
+ * full enumeration runs again; it is a no-op if one is already scheduled, and already-indexed
+ * files are skipped.
+ */
+class Reindex extends Command {
+
+	public function __construct(
+		private IJobList $jobList,
+	) {
+		parent::__construct();
+	}
+
+	protected function configure() {
+		$this->setName('context_chat:reindex')
+			->setDescription('Schedule a full re-crawl of all mounts. Indexed files are not re-indexed when compared against context_chat_backend\'s vector DB.');
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		if ($this->jobList->has(SchedulerJob::class, null)) {
+			$output->writeln('<comment>A full re-crawl is already scheduled; nothing to do.</comment>');
+			return 0;
+		}
+
+		$this->jobList->add(SchedulerJob::class);
+		$output->writeln('<info>Scheduled a full re-crawl. SchedulerJob will enumerate all mounts on its next run.</info>');
+		return 0;
+	}
+}