Creating additional subsegments

In the user model class, the application manually creates subsegments to group all downstream calls made within the saveUser function and adds metadata.

Example src/main/java/scorekeep/UserModel.java - Custom subsegments

import com.amazonaws.xray.AWSXRay;
import com.amazonaws.xray.entities.Subsegment;
...
    public void saveUser(User user) {
    // Wrap in subsegment
    Subsegment subsegment = AWSXRay.beginSubsegment("## UserModel.saveUser");
    try {
      mapper.save(user);
    } catch (Exception e) {
      subsegment.addException(e);
      throw e;
    } finally {
      AWSXRay.endSubsegment();
    }
  }