@mstan — sorry that you haven't received a response.
NodeBB doesn't save the Mongo database anywhere specific on the file system, it would be wherever the insulted MongoDB install saves it's data.
When I enter a nodebb topic, the 1 in the link disappears.
but it stays permanently on my site.
Does Google negatively affect SEO?
I use version: 2.5.8
@hellomydude this is probably because that topic on your site had multiple posts, but the example topic on this site only had one.
Regardless it should not affect SEO.
no, the example on my site also has 1 post. For example, when we go back to the 1st post on this site, the number 1 disappears.
No, it doesn't affect SEO. It's just a way to easily navigate to the proper post on the topic (by its index).