I am currently using a great WP plugin called Subscribe to Comments Reloaded.  As good as it is, it's just a simple plugin to let users subscribe to posts and doesn't do much more than this. 

Now that I am going to upgrade to WPDiscuz it hit me that I need to ideally import that existing subscription data.

Do you support this any how?   I see that on your wp_wc_comments_subscription  table you have an "imported_from" column.   That makes me thing you must have some kind of import, am I right?

If no interface exists for me to do this and I need to do it manually in code can I just check a few things about your wp_wc_comments_subscription  table? 

1) what is subscription_id used for?

2) can I not include an activation_key value if I force these values into the table?   Is it ok to ignore that column?

Thanks for your time