Entity example

UserAccount.kt

@Document
data class UserAccount(
	@Id
	val _id: ObjectId = ObjectId(),
	var name: String,
	var createdAt: Instant = Instant.now(),
	var updatedAt: Instant = Instant.now()
) {
	var auditTrail: List<String> = listOf()
        fun updateName(name: String) {
		this.auditTrail = auditTrail.plus(
			“${this.name} -> ${name}”
		)
		this.name = name
		this.updatedAt = Instant.now()
	}
}