--- /dev/null
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2020 Joas Schilling <coding@schilljs.com>
+ *
+ * @author Joas Schilling <coding@schilljs.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Core\Migrations;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version20000Date20201111081915 extends SimpleMigrationStep {
+ /**
+ * @param IOutput $output
+ * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+ * @param array $options
+ * @return null|ISchemaWrapper
+ */
+ public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+ /** @var ISchemaWrapper $schema */
+ $schema = $schemaClosure();
+
+ $result = $this->ensureColumnIsNullable($schema, 'direct_edit', 'accessed');
+
+ return $result ? $schema : null;
+ }
+
+ protected function ensureColumnIsNullable(ISchemaWrapper $schema, string $tableName, string $columnName): bool {
+ $table = $schema->getTable($tableName);
+ $column = $table->getColumn($columnName);
+
+ if ($column->getNotnull()) {
+ $column->setNotnull(false);
+ return true;
+ }
+
+ return false;
+ }
+}