Use of tinyint causes PDO Exception

In the course of doing something similar to this module, amongst a number of things I found a pretty nasty bug in the install file. It's due to the use of 'tinyint' for the 'id'. This is just simply too small for a primary key. If you have more than 127 records, you may encounter problems using the table and over 255, a PDO Exception for sure since it can only hold 1 bit (255 is the largest number that can fit!)

Do it like this

<?php
function admin_notes_schema() {
  $schema['admin_notes'] = array(
    'fields' => array(
      'id' => array(
        'description' => 'The primary identifier for an admin note.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
//...
    ),
  );
}
?>