{
   "TableName": "uistsplit",
   "ScanIndexForward": "false",
   "Limit": 1,
   "IndexName": "role_id-timestamp-index",
   "KeyConditionExpression": "role_id = :v1",
   "ExpressionAttributeValues": {
       ":v1": {
           "S": "$input.params('dbjson')"
       }
   }
}