@Dao
interface ConcertDao {
    // The Int type parameter tells Room to use a PositionalDataSource
    // object, with position-based loading under the hood.
    @Query("SELECT * FROM Concerts ORDER BY date DESC")
    fun concertsByDate(): DataSource.Factory<Int, Concert>
}

data class Concert(val date: Long, val bands: List<Band>)

@Table(name = "Concerts")
class YakTimelineEventAA(): YakModelAA(){

    @Column(name = "Bands")
    var bands: String? = null

    @Column(name = "Date", index = true)
    var date: Long? = null

}