public class Observation
{
    public Guid Id { get; set; }
    public Guid EncounterId { get; set; }
    public string ObservationCode { get; set; } = null!;
    public decimal Value { get; set; }
    public string Unit { get; set; } = null!;
    public ObservationSource Source { get; set; } = ObservationSource.Manual;
    public string? IdempotencyKey { get; set; }
    public DateTimeOffset RecordedAt { get; set; }
    public DateTimeOffset CreatedAt { get; set; }

    public Encounter Encounter { get; set; } = null!;
}