code: private String createRow(String key, String appid, Map<String, AttributeValue> row) {
  		if (StringUtils.isBlank(key) || StringUtils.isBlank(appid) || row == null || row.isEmpty()) {
  			return null;
  		}
  		try {
  			key = getKeyForAppid(key, appid);
  			setRowKey(key, row);
  			PutItemRequest putItemRequest = new PutItemRequest(getTableNameForAppid(appid), row);
  			client().putItem(putItemRequest);
  		} catch (Exception e) {
  			logger.error("Could not write row to DB - appid={}, key={}", appid, key, e);
  			throwIfNecessary(e);
  		}
  		return key;
  	}
docs: ///////////////////////////////////////////