[Messaging] adds last_message_at field
[Messaging] adds last_message_at field

craigspaeth/metaphysics,artsy/metaphysics,mzikherman/metaphysics-1,artsy/metaphysics,broskoski/metaphysics,mzikherman/metaphysics-1,mzikherman/metaphysics-1,mzikherman/metaphysics-1,artsy/metaphysics,craigspaeth/metaphysics