The extra pages are created because of the use of the slash (/), which is reserved for namespaces (a relatively recent feature). One way to avoid their creation is to change the format of the date (in Settings → Editor → Preferred date format, then re-index), so as it doesn’t contain a slash. As about multiple-pages filtering, selection, deletion etc., they have already been asked in various Feature Requests and will hopefully get implemented one day.
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