public class ObservationDocument
{
    public string ObservationId { get; set; } = null!;
    public string EncounterId { get; set; } = null!;
    public string PatientId { get; set; } = null!;
    public string Mrn { get; set; } = null!;
    public string ObservationCode { get; set; } = null!;
    public double Value { get; set; }
    public string Unit { get; set; } = null!;
    public string Source { get; set; } = null!;
    public DateTimeOffset RecordedAt { get; set; }
}