GerbilManager/GerbilManagerWebAPI/Models/Gerbil.cs

using System.ComponentModel.DataAnnotations;

namespace GerbilManagerWebAPI.Models
{
    /// <summary>
    /// A gerbil (Rennmaus). Pedigree is traversed via Litter → Father/Mother (no redundant
    /// parent FKs here). Genotype is one compact frozen-contract string (e.g.
    /// "Aa CC Dd EE GG Pp Spsp rere", "?" wildcards allowed); never SQL-filtered.
    /// </summary>
    public class Gerbil
    {
        [Key]
        public Guid Id { get; set; }
        public required string Name { get; set; }
        public Gender Gender { get; set; }
        public GerbilStatus Status { get; set; } = GerbilStatus.Active;

        // Birth litter (the litter this gerbil was born in).
        public Guid? LitterId { get; set; }
        public Litter? Litter { get; set; }

        // Contacts: Herkunft (origin) and Abnehmer (receiver, when given away).
        public Guid? OriginContactId { get; set; }
        public Contact? OriginContact { get; set; }
        public Guid? ReceiverContactId { get; set; }
        public Contact? ReceiverContact { get; set; }

        // Current home.
        public Guid? EnclosureId { get; set; }
        public Enclosure? Enclosure { get; set; }

        // Farbschlag.
        public Guid? ColorVarietyId { get; set; }
        public ColorVariety? ColorVariety { get; set; }

        public DateOnly? DateOfBirth { get; set; }
        public DateOnly? DateOfDeath { get; set; }
        public string? CauseOfDeath { get; set; }
        public DateOnly? GoHomeDate { get; set; }

        /// <summary>Compact genotype string (frozen GEN-1 contract). Null = not genotyped.</summary>
        public string? Genotype { get; set; }

        public string? Notes { get; set; }

        // Provenance (for the FEAT-8 spreadsheet import).
        public string? ImportSource { get; set; }
        public string? ExternalRef { get; set; }
    }
}