Repository Pattern DB DTO

DBProduct.kt

// Database DTO
@Entity(tableName = "Product")
data class DBProduct(
    @PrimaryKey                
    @ColumnInfo(name = "id")                
    val id: String,                
    @ColumnInfo(name = "name")                
    val name: String,
    @ColumnInfo(name = "nowPrice")
    val nowPrice: Double,
    @ColumnInfo(name = "wasPrice")
    val wasPrice: Double
)