fix: widen owner_uid and editor_uid columns to support federated cloud IDs

When a federated cloud ID exceeds 64 characters, the owner_uid and
editor_uid columns in oc_richdocuments_wopi silently truncate the value,
which can prevent federated users from opening documents in Collabora.

Widen both columns from varchar(64) to varchar(255) to accommodate the
full length of federated cloud IDs in the format user@remote.domain.

Signed-off-by: James Manuel <moodyjmz@users.noreply.github.com>

Author: moodyjmz

lib/Migration/Version10100Date20260226000000.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Richdocuments\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+use Override;
+
+/**
+ * Widen owner_uid and editor_uid columns from varchar(64) to varchar(255) to support federated cloud IDs
+ */
+class Version10100Date20260226000000 extends SimpleMigrationStep {
+	#[Override]
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+		$changed = false;
+
+		if ($schema->hasTable('richdocuments_wopi')) {
+			$table = $schema->getTable('richdocuments_wopi');
+			foreach (['owner_uid', 'editor_uid'] as $columnName) {
+				if ($table->hasColumn($columnName) && $table->getColumn($columnName)->getLength() < 255) {
+					$table->changeColumn($columnName, [
+						'length' => 255,
+					]);
+					$changed = true;
+				}
+			}
+		}
+
+		return $changed ? $schema : null;
+	}
+}