{
"_id": 123asd1241231231231, // can use this for conversation_id as well since its unique
"uids": [1, 2, 3], // i think this is a valid list right?
"messages": [{
    "_id": 123asd123123123, // is this possible?
    "uid": 1,
    "timestamp": 123123123, // errr, maybe this is redundant, doesn't the _id have the timestamp built in?  Can it easily be extracted?
    "message": "this is a test message"
  },
  ...
  ]
}