[{supplier:"1",publisher:"2",partner:"3",buyer:"4",started_at:"2022-01-01",starts:1},{supplier:"2",publisher:"2",partner:"3",buyer:"4",started_at:"2022-01-01",starts:1},{supplier:"1",publisher:"2",partner:"3",buyer:"4",finished_at:"2025-01-01",completes:2,revenue:50},{supplier:"5",publisher:"2",partner:"6",buyer:"4",finished_at:"2025-01-01",completes:2,revenue:50}]

db.collection.aggregate([{$group:{_id:{supplier:"$supplier",publisher:"$publisher",partner:"$partner",buyer:"$buyer"},started_at:{$max:"$started_at"},starts:{$max:"$starts"},revenue:{$max:"$revenue"},finished_at:{$max:"$finished_at"},completes:{$max:"$completes"}}},{$set:{buyer:"$_id.buyer",partner:"$_id.partner",publisher:"$_id.publisher",supplier:"$_id.supplier",_id:"$$REMOVE"}}])