Issue with Disqus comments
Yes, the Disqus module has it own table (named disqus).

To see this table, look up the file disqus.install and examine the array called $schema.

You'll find this file inside the project directory (normally sites/all/modules/disqus/) where you installed Disqus, or in the project's git repo at drupalcode.org.

The Disqus schema is reproduced below for easy reference:

$schema['disqus'] = array(
  'fields' =&gt; array(
    'did' =&gt; array(
      'type' =&gt; 'serial',
      'not null' =&gt; TRUE,
     ),
     'nid' =&gt; array(
       'type' =&gt; 'int',
       'not null' =&gt; TRUE,
       'default' =&gt; 0,
     ),
     'status' =&gt; array(
       'type' =&gt; 'int',
       'unsigned' =&gt; TRUE,
       'size' =&gt; 'tiny',
       'not null' =&gt; TRUE,
       'default' =&gt; 0,
     ),
  ),
  'primary key' =&gt; array('did'),
  'indexes' =&gt; array(
    'nid' =&gt; array('nid'),
    'status' =&gt; array('status'),
  ),
);