I am developing an Android expense-tracking application using Kotlin and Jetpack Compose. My project uses the gastos-core:1.1.0 library, which defines a GastoRepository interface.

Its agregar method returns a Gasto object:

suspend fun agregar(gasto: Gasto): Gasto

I am adding Room to persist expenses locally. My entity uses an auto-generated primary key:

@Entity(tableName = "gastos")
data class GastoEntity(
    @PrimaryKey(autoGenerate = true)
    val id: Int = 0,
    val descripcion: String,
    val monto: Double,
    val categoria: String,
    val fecha: String
)

My DAO insert method is currently declared as:

@Insert
suspend fun insertar(gasto: GastoEntity)

The repository must implement agregar and return a Gasto, but the DAO method above does not return the generated database ID.

How should I implement this operation so that Room inserts the entity, retrieves the generated ID, and returns the corresponding Gasto object while preserving the existing repository interface?