ZbMATH sent an article for post-publication review. As of a little more than a month ago, I worked at the same department in the same university as one of the authors. We have not cooperated on a paper, but have otherwise interacted.
Should I decline to review the paper due to this conflict of interest (as I would do with a peer review for e.g. a journal article), or do zbMATH reviews have more lax standards for conflicts of interest? The reviews are post-publication, and for a review database and not a journal, and furthermore they are not anonymous, so they are quite different from journal peer reviews.
The review guidelines of zbMATH did not mention conflicts of interest.