Merging archive data: What exactly is in blobs?

General questions
1

I suspect the code for merging two sites mentioned in the forum ( Tutorial for merge 2 site IDS data (Working method) ) might be incorrect, but it depends on the contents of a blob.

I can decode a blob entry (-> Base64 → ungzip → unserialize) and the result is someting like this:

array (
  0 => 
  array (
    0 => 
    array (
      'label' => '[... Some page name...]',
      2 => 74,
      12 => 87,
      13 => 842,
      30 => 0.0,
      31 => 0,
      32 => NULL,
      33 => false,
      'sum_time_network' => 16.175,
      'nb_hits_with_time_network' => 86,
      'min_time_network' => 0.0,

My question is: What are those “2 => 74” things? Are those references to other tables, like _log_actions?

If so, that would mean that any merging of two sites would be very difficult as we would need to adjust any duplicates in the blobs and in the referenced table(s).

Thank you for any insight!