improvements on private comments

src/Bundle/ChillActivityBundle/migrations/Version20220527124438.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Chill\Migrations\Activity;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20220527124438 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'add private comment to activity';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE activity ADD privateComment_comments JSON DEFAULT \'{}\'');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE chill_person_accompanying_period_work DROP privateComment_comments');
+    }
+}