$random = new \Drupal\Component\Utility\Random();
$string = $random->string();

I need to drop all tables with name test_*

First execute this sql code and get new statement

Just add these styles for slick block container

max-width: 100vw;
width: 100%;
overflow: hidden;

Before:

$moderators = \Drupal::entityQuery('user')
 ->condition('status', 1)
 ->condition('roles', $moderator_role)
 ->execute();

After:

Add to settings.local.php:

use Drupal\Core\Mail\MailManagerInterface;

...

use Drupal\Core\Config\ConfigFactoryInterface;

...

 $config_factory = \Drupal::configFactory();
 $config = $config_factory->getEditable('system.maintenance');
 $config->set('message', 'test');
 $config->save(TRUE);

Create mymodule.links.task.yml and add some lines

   $content_entity_types = [];
   $entity_type_definations = \Drupal::entityTypeManager()->getDefinitions();
   /* @var $definition EntityTypeInterface */
   foreach ($entity_type_definations as $definition) {
     if ($definition instanceof ContentEntityType) {
       $content_entity_types[] = $definition;
     }
   }