update data model

[texasRanger09]

{ _id: , // peer key secondsInterval: String, // how often does the heartbeat tool take a snapshot and store it here (in seconds) lastUpdated: String (ISO-8601 UTC), // when this document was written. If this is farther in the past than the interval, this device is "offline" sdk: String, // Ditto SDK version presenceSnapshotDirectlyConnectedPeersCount: Int, // from presence graph snapshot presenceSnapshotDirectlyConnectedPeers: { // from presence graph snapshot

: { deviceName: String, sdk: String, isConnectedToDittoCloud: Bool, bluetooth: Int, p2pWifi: Int, lan: Int, }, …, … }, metaData: {} }