materio-base-d7/sites/all/modules/contrib/users/forgotten_login/forgotten_login.install

<?php

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

/**
 * Implements hook_install().
 */
function forgotten_login_install() {
  $spec = array(
    'type' => 'int',
    'size' => 'normal',
    'unsigned' => TRUE,
    'not null' => TRUE,
    'default' => 0,
    'initial' => 0,
  );
  db_add_field('users', 'forgotten_login_attempts', $spec);

  $t = get_t();
  $t_args = array('@settings_page_url' => url('admin/config/people/forgotten_login'));
  drupal_set_message($t('Forgotten login module has been installed. You will need to visit the <a href="@settings_page_url">settings page</a> to set a login attempts limit before this module will do anything.', $t_args));
}

/**
 * Implements hook_uninstall().
 */
function forgotten_login_uninstall() {
  db_drop_field('users', 'forgotten_login_attempts');
}

/**
 * Implements hook_schema_alter().
 */
function forgotten_login_schema_alter(&$schema) {
  // Add field to existing schema.
  $schema['users']['fields']['forgotten_login_attempts'] = array(
    'type' => 'int',
    'size' => 'normal',
    'unsigned' => TRUE,
    'not null' => TRUE,
    'default' => 0,
    'description' => 'How many failed login attempts the user has made.',
  );
}