Line item entity

LineItem.kt

@Entity(tableName = "line_items")
data class LineItem(
    @PrimaryKey(autoGenerate = true)
    @ColumnInfo(name = "lineItemId")
    val id: Long,

    @ColumnInfo(name = "productId")
    val productId: String,

    @ColumnInfo(name = "orderId")
    val orderId: String,

    @ColumnInfo(name = "quantity")
    var quantity: Int,

    @ColumnInfo(name = "subtotal")
    var subtotal: Double,
 )