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public class Subscription {
  String appId;
  String studyId;
  MessageType messageType;
  String recipientId;
}

// As submitted
public class Message {
  String studyId;
  MessageType messageType;
  String text;
}

// As persisted, one messagerecord per subscription
public class Message {
  String guid;
  String appId;
  String studyId;
  String userId;
  MessageType messageType;
  String text;
  boolean read;
  String readBy;
}