drupal/core/modules/user/user.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the user module.
 */

/**
 * Implements hook_schema().
 */
function user_schema() {
  $schema['users_data'] = [
    'description' => 'Stores module data as key/value pairs per user.',
    'fields' => [
      'uid' => [
        'description' => 'Primary key: {users}.uid for user.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ],
      'module' => [
        'description' => 'The name of the module declaring the variable.',
        'type' => 'varchar_ascii',
        'length' => DRUPAL_EXTENSION_NAME_MAX_LENGTH,
        'not null' => TRUE,
        'default' => '',
      ],
      'name' => [
        'description' => 'The identifier of the data.',
        'type' => 'varchar_ascii',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
      ],
      'value' => [
        'description' => 'The value.',
        'type' => 'blob',
        'not null' => FALSE,
        'size' => 'big',
      ],
      'serialized' => [
        'description' => 'Whether value is serialized.',
        'type' => 'int',
        'size' => 'tiny',
        'unsigned' => TRUE,
        'default' => 0,
      ],
    ],
    'primary key' => ['uid', 'module', 'name'],
    'indexes' => [
      'module' => ['module'],
      'name' => ['name'],
    ],
    'foreign keys' => [
      'uid' => ['users' => 'uid'],
    ],
  ];

  return $schema;
}

/**
 * Implements hook_install().
 */
function user_install() {
  $storage = \Drupal::entityManager()->getStorage('user');
  // Insert a row for the anonymous user.
  $storage
    ->create([
      'uid' => 0,
      'status' => 0,
      'name' => '',
    ])
    ->save();

  // We need some placeholders here as name and mail are unique.
  // This will be changed by the settings form in the installer.
  $storage
    ->create([
      'uid' => 1,
      'name' => 'placeholder-for-uid-1',
      'mail' => 'placeholder-for-uid-1',
      'status' => TRUE,
    ])
    ->save();
}

/**
 * Fix invalid token in the status_blocked email body.
 */
function user_update_8100() {
  $config_factory = \Drupal::configFactory();
  $config = $config_factory->getEditable('user.mail');
  $mail = $config->get('status_blocked');
  if (strpos($mail['body'], '[site:account-name]') !== FALSE) {
    $mail['body'] = str_replace('[site:account-name]', '[site:name]', $mail['body']);
    $config->set('status_blocked', $mail)->save(TRUE);
  }
}