Preparations for coming features (#1818)

* removed unused convert_tz code
* added timestampable listener to support automatic updates of change columns
* added modified_at, billable and category timesheet fields
* new timesheet API query parameter modified_after

src/Migrations/Version20200705152310.php

@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace DoctrineMigrations;
+
+use App\Doctrine\AbstractMigration;
+use Doctrine\DBAL\Schema\Schema;
+
+/**
+ * @version 1.10
+ */
+final class Version20200705152310 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Updated invoice and added timesheet columns';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $invoices = $schema->getTable('kimai2_invoices');
+        $invoices->getColumn('invoice_filename')->setLength(150);
+
+        $timesheet = $schema->getTable('kimai2_timesheet');
+        $timesheet->addColumn('billable', 'boolean', ['notnull' => false, 'default' => true]);
+        $timesheet->addColumn('category', 'string', ['length' => 10, 'notnull' => true, 'default' => 'work']);
+        $timesheet->addColumn('modified_at', 'datetime', ['notnull' => false]);
+    }
+
+    public function down(Schema $schema): void
+    {
+        $invoices = $schema->getTable('kimai2_invoices');
+        $invoices->getColumn('invoice_filename')->setLength(100);
+
+        $timesheet = $schema->getTable('kimai2_timesheet');
+        $timesheet->dropColumn('billable');
+        $timesheet->dropColumn('category');
+        $timesheet->dropColumn('modified_at');
+    }
+
+    protected function isSupportingForeignKeys(): bool
+    {
+        return false;
+    }
+
+    public function isTransactional(): bool
+    {
+        if ($this->isPlatformSqlite()) {
+            // does fail if we use transactions, as tables are re-created and foreign keys would fail
+            return false;
+        }
+
+        return true;
+    }
+}