drupal/core/modules/shortcut/shortcut.install

<?php

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

/**
 * Implements hook_schema().
 */
function shortcut_schema() {
  $schema['shortcut_set_users'] = [
    'description' => 'Maps users to shortcut sets.',
    'fields' => [
      'uid' => [
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The {users}.uid for this set.',
      ],
      'set_name' => [
        'type' => 'varchar_ascii',
        'length' => 32,
        'not null' => TRUE,
        'default' => '',
        'description' => "The {shortcut_set}.set_name that will be displayed for this user.",
      ],
    ],
    'primary key' => ['uid'],
    'indexes' => [
      'set_name' => ['set_name'],
    ],
    'foreign keys' => [
      'set_user' => [
        'table' => 'users',
        'columns' => ['uid' => 'uid'],
      ],
      'set_name' => [
        'table' => 'shortcut_set',
        'columns' => ['set_name' => 'set_name'],
      ],
    ],
  ];

  return $schema;
}

/**
 * Implements hook_install().
 */
function shortcut_install() {
  // Theme settings are not configuration entities and cannot depend on modules
  // so to set a module-specific setting, we need to set it with logic.
  foreach (['seven', 'claro'] as $theme) {
    if (\Drupal::service('theme_handler')->themeExists($theme)) {
      \Drupal::configFactory()
        ->getEditable("$theme.settings")
        ->set('third_party_settings.shortcut.module_link', TRUE)
        ->save(TRUE);
    }
  }
}

/**
 * Implements hook_uninstall().
 */
function shortcut_uninstall() {
  // Theme settings are not configuration entities and cannot depend on modules
  // so to unset a module-specific setting, we need to unset it with logic.
  foreach (['seven', 'claro'] as $theme) {
    if (\Drupal::service('theme_handler')->themeExists($theme)) {
      \Drupal::configFactory()
        ->getEditable("$theme.settings")
        ->clear('third_party_settings.shortcut')
        ->save(TRUE);
    }
  }
}