okay, it turns out I had a few files in which I had set a #+roam_key: property in the heading but left it empty. deleting #+roam_key: from those files or adding a link so the property wouldn’t be empty fixed the issue. deleted db once more and restarted emacs => all files in org-roam-directory are now visible in org-roam. thanks for triggering me onto this further investigation @doubleloop 
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