EDIT

<?php

/**

 * @file

 * Install, update, and uninstall functions for the ext_links module.

 */

/**

 * Implements hook_schema().

 */

function ext_links_schema() {

  $schema['ext_links'] = [

    'description' => 'Table external link templates.',

    'fields' => [

      'id' => [

        'type' => 'varchar',

        'length' => 32,

        'not null' => TRUE,

        'default' => '',

        'description' => 'Name of the ext_link being referenced.',

      ],

      'title' => [

        'type' => 'varchar',

        'length' => 255,

        'not null' => TRUE,

        'description' => 'The link title',

      ],

      'link' => [

        'type' => 'varchar',

        'length' => 255,

        'not null' => TRUE,

        'description' => 'The link url template',

      ],

      'glue' => [

        'type' => 'varchar',

        'length' => 10,

        'not null' => TRUE,

        'description' => 'The string to concatenate name parts in the URL query string',

      ],

      'weight' => [

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'Weight of filter within format.',

      ],

      'status' => [

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'External link enabled status. (1 = enabled, 0 = disabled)',

      ],

    ],

    'primary key' => ['id'],

    'indexes' => [

      'list' => ['weight', 'id'],

    ],

  ];

  return $schema;

}