Articles with DOIs use that instead of a retrieval date/url/databasename combination.
Is there any way that the issue number could be removed from the APA formatting of journal articles in bibliographies? [...] In APA format, issue numbers are excluded unless the journal resets page numbers with each issue. I assume zotero has no way of knowing whether that is true for any given journal, but since 98% of journals use continuous pagination, it makes more sense to have the "default" behavior be to leave out the issue number.
<choose><if variable="page"></if><else><text variable="issue" prefix="(" suffix=")"/></else></choose>