self.matrix.joined_rooms_sync()
	println('sync_rooms: matrix joined_rooms $self.matrix.rooms')
	needs_to_join := matrix.rooms_subtract(db_rooms, self.matrix.rooms)

	//self.matrix.joined_rooms_sync()
	j_rooms := self.matrix.joined_rooms() or { panic('joined_rooms fail') }
	println('sync_rooms: matrix joined_rooms $j_rooms')
	needs_to_join := matrix.rooms_subtract(db_rooms, j_rooms)