trymoose

I've been generating and viewing them on iOS. I don't think I've seen one with a `NULL` payload before.

[I've made some progress implementing support for these messages.](https://github.com/trymoose/imessage-exporter/tree/feature/digital-touch) - [x] Tap - [x] Heartbeat - [x] Heartbreak - [x] Kiss - [x] Sketch - [x] Fireball - [ ]...

> Ok, so the one that had a `NULL` payload used the `subject` column (the one used for message subject lines) contained a GUID that mapped to an existing Digital...

The only other thought I have right now is that it might be related to the announcements that show up saying "person kept a Digital Touch Message from you."

I found some of the `NULL` payloads in my databases. I saw the database shows they are not delivered but `finished`:  I had the same `item_type`...