I’m working on a project where I need to import approximately 16 million users into a NodeBB forum.
In addition to the standard fields, I also need to set some custom fields for each user during the import.

I’ve already tried a few approaches:

• Direct writes to MongoDB (objects collection), but it seems there’s a lot happening under the hood when creating a user (hooks, hashes, plugins, etc.), and it’s almost impossible to replicate everything manually.
• Using the Write API (POST /api/v3/users) works correctly, but it’s painfully slow at scale.
• The CSV Import plugin doesn’t allow me to set the user’s creation date (timestamp), which is essential for my use case, so it’s not an option either.

Has anyone dealt with importing a very large number of users into NodeBB?
Do you have any recommendations or best practices for this kind of task?

Thanks in advance for any advice or ideas!