Changed endpoints and db queries, chart now shows suggested mins and maxes

Snapshot.go

@@ -43,7 +43,7 @@ func createSnapshotSubFromJsonBodyStream(jsonBodyStream io.ReadCloser) (*Snapsho
 func createJsonFromSnapshotRecords(records []*SnapshotRecord) ([]byte, error) {
 	jsonResult, err := json.Marshal(SnapshotPayload{records})
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("couldn't marshal json: %w", err)
 	}
 	return jsonResult, nil
 }