Prefer update documents instead of inserting

gather/src/index.js

@@ -20,12 +20,12 @@ async function initDB () {
 
     const setPrice = await item.set.getPrice()
     if (partsPrice < setPrice) {
-      const scanResult = new models.ScanResult({
+      models.ScanResult.findOneAndUpdate(
-        name: item.name,
+        { name: item.name },
-        partsPrice,
+        { partsPrice, setPrice },
-        setPrice
+        { upsert: true },
-      })
+        () => {}
-      scanResult.save()
+      )
     }
   }
 })()