Hey Drupal guys and gals :)
I'm working on converting my site to Drupal. The site, neverside.com, currently runs on a custom CMS (programmed by someone besides myself) and has quite a lot of content and users that I need to import into Drupal... about 21,000 users... 95,000 forum threads (nodes)... and 711,000 replies (comments). The site is currently dead/inactive, but with Drupal's magic I shall revive it! :D I'll be importing the nodes and comments as well, though trying to tackle users first.
I've investigated the User Import module, and determined it may not be usable for my needs (multi-hundred MB size of the CVS files aside, it's important that all my User IDs remain exactly the same to ensure that all the other content stays in sync with the correct users, even if some rows in my user table are missing - it looks like the User Import module will import users and create new ones in sequence, possibly changing a user's ID if there are any missing rows. I think the only way to ensure that IDs remain the same is to manually import the users via SQL.
As I'm not very proficient with programming or databases, I'm hoping someone can help me craft the correct SQL query I'll need to manually add users into Drupal's users table, and help me make sure it's done correctly.