Hi,

I want to have the following feature on my website:

I want user to be able to receive emails when ever someone posts a comment on a node that they commented on.

I created custom subscriptions but haven't added any new fields to it.

I want to use Drupal hooks to detect the new comments and then check the users that already commented on this node and who are subscribed to this kind of notifications. After that I want to add them to the notifications queue.

My question is the following:

If I populate the list of users, can I simply insert them to the {notifications_queue} table?
How can I handle the "Immediate" notifications? Should I set "send_interval" to zero?

Thanks in advance.