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unless I'm misunderstanding what you're after.

> unless I'm misunderstanding what you're after.

Yes. My question is: do I need to write a crawler following next links or is there a way to have a single unpaginated list?

If you go to your profile there are links for your post submissions, your comments, favorites, etc.

You can use „by:“ in the search query to limit search to posts or comments of a user.

When they have a unique name, it doesn't seem to matter.