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db.collection.aggregate([{$group:{_id:{$dateAdd:{startDate:new Date(),unit:"minute",amount:{$multiply:[{$ceil:{$divide:[{$dateDiff:{startDate:"$date",endDate:new Date(),unit:"minute"}},15]}},-15]}}},floorPrice:{"$min":"$floorPrice"},listedCount:{"$min":"$listedCount"}}}])