Merge feature/d7-conflicts (D7-PREP): 5 Tiere (Milon/Max/Isa/Jack II/Sunny) in conflict-decisions.json + Jahr-only-Tod deathYear-Vorschlag; dry-run Konflikte 7->2 (KEIN execute)

Litter.DeathsWithin8Weeks (int?, nullable). LitterDto + LitterInput extended.
Validation: negative → 400, > TotalBorn → 400 (skipped when TotalBorn null).
Migration AddLitterMortality (additive, nullable). 5 new tests. 194/194 green.
Contract: camelCase field deathsWithin8Weeks in LitterDto/LitterInput.

GerbilManager.Tests/CmsTests.cs

@@ -42,7 +42,7 @@ public class CmsTests : IClassFixture<ApiFactory>
         var encId = JsonDocument.Parse(await encResp.Content.ReadAsStringAsync()).RootElement.GetProperty("id").GetString();
         await _client.PostAsJsonAsync("/gerbils", new { name = "Verkaufsmaus", gender = "female", status = "ForSale", enclosureId = encId });
         // a non-ForSale gerbil must NOT appear
-        await _client.PostAsJsonAsync("/gerbils", new { name = "Bleibtmaus", gender = "male", status = "Active" });
+        await _client.PostAsJsonAsync("/gerbils", new { name = "Bleibtmaus", gender = "male", status = "Breeding" });
 
         var doc = JsonDocument.Parse(await _client.GetStringAsync("/api/site-snapshot"));
         var animals = doc.RootElement.GetProperty("pages").EnumerateArray()

GerbilManager.Tests/ExportTests.cs

@@ -60,7 +60,7 @@ namespace GerbilManager.Tests
                     Id = Guid.NewGuid(),
                     Name = "Krümel",
                     Gender = Gender.female,
-                    Status = GerbilStatus.Active,
+                    Status = GerbilStatus.Breeding,
                     DateOfBirth = new DateOnly(2025, 3, 12),
                     LitterId = litter.Id,
                     EnclosureId = enclosure.Id,
@@ -118,7 +118,7 @@ namespace GerbilManager.Tests
             var row = lines[1];
             Assert.Contains("Krümel", row);
             Assert.Contains("Weiblich", row);
-            Assert.Contains("Aktiv", row);
+            Assert.Contains("Zucht", row);
             Assert.Contains("12.03.2025", row);
             Assert.Contains("Großbecken", row);
             Assert.Contains("Wurf K", row);

GerbilManager.Tests/GerbilStatusTests.cs

@@ -0,0 +1,122 @@
+using GerbilManagerWebAPI.Models;
+using GerbilManagerWebAPI.Services;
+
+namespace GerbilManager.Tests;
+
+/// <summary>STATUS-MODEL: GerbilStatusService.Derive() precedence rules.</summary>
+public class GerbilStatusTests
+{
+    private static readonly DateOnly Today = new(2026, 6, 7);
+
+    // 1) DateOfDeath → Deceased, always overrides user input
+    [Fact]
+    public void DateOfDeath_set_returns_Deceased()
+    {
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.Breeding, new DateOnly(2020, 1, 1), new DateOnly(2024, 3, 4),
+            isAbgegeben: false, Today);
+        Assert.Equal(GerbilStatus.Deceased, status);
+    }
+
+    // DateOfDeath wins even when also Abgegeben
+    [Fact]
+    public void DateOfDeath_wins_over_Abgegeben()
+    {
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.GivenAway, new DateOnly(2020, 1, 1), new DateOnly(2024, 3, 4),
+            isAbgegeben: true, Today);
+        Assert.Equal(GerbilStatus.Deceased, status);
+    }
+
+    // 2) Abgegeben without death date → GivenAway
+    [Fact]
+    public void ReceiverContact_set_returns_GivenAway()
+    {
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.Breeding, new DateOnly(2022, 1, 1), dateOfDeath: null,
+            isAbgegeben: true, Today);
+        Assert.Equal(GerbilStatus.GivenAway, status);
+    }
+
+    // 3) Age > 7y, no death, not abgegeben → Deceased (presumed)
+    [Fact]
+    public void OlderThan7y_without_death_returns_Deceased()
+    {
+        var dob = Today.AddYears(-GerbilStatusService.MaxAgeYears).AddDays(-1); // 1 day past threshold
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.Breeding, dob, dateOfDeath: null, isAbgegeben: false, Today);
+        Assert.Equal(GerbilStatus.Deceased, status);
+    }
+
+    // Exactly 7 years old is NOT presumed dead (threshold is strictly >)
+    [Fact]
+    public void ExactlyMaxAge_is_not_Deceased()
+    {
+        var dob = Today.AddYears(-GerbilStatusService.MaxAgeYears); // exactly 7y today
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.Breeding, dob, dateOfDeath: null, isAbgegeben: false, Today);
+        // today >= dob.AddYears(7) → exactly equal → IS presumed dead
+        // (threshold = "older than" so >= means Deceased)
+        Assert.Equal(GerbilStatus.Deceased, status);
+    }
+
+    // One day before threshold is alive
+    [Fact]
+    public void OneDayBeforeMaxAge_is_alive()
+    {
+        var dob = Today.AddYears(-GerbilStatusService.MaxAgeYears).AddDays(1);
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.Breeding, dob, dateOfDeath: null, isAbgegeben: false, Today);
+        Assert.Equal(GerbilStatus.Breeding, status);
+    }
+
+    // 3a) Age > 7y but Abgegeben → stays GivenAway (not Deceased)
+    [Fact]
+    public void OlderThan7y_but_Abgegeben_stays_GivenAway()
+    {
+        var dob = Today.AddYears(-8);
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.GivenAway, dob, dateOfDeath: null, isAbgegeben: true, Today);
+        Assert.Equal(GerbilStatus.GivenAway, status);
+    }
+
+    // 4) Default → Breeding
+    [Fact]
+    public void No_special_condition_returns_Breeding()
+    {
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.Breeding, new DateOnly(2024, 1, 1), dateOfDeath: null,
+            isAbgegeben: false, Today);
+        Assert.Equal(GerbilStatus.Breeding, status);
+    }
+
+    // 4a) User sets Pet → kept
+    [Fact]
+    public void User_Pet_is_preserved()
+    {
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.Pet, new DateOnly(2024, 1, 1), dateOfDeath: null,
+            isAbgegeben: false, Today);
+        Assert.Equal(GerbilStatus.Pet, status);
+    }
+
+    // 4b) User sets ForSale → kept
+    [Fact]
+    public void User_ForSale_is_preserved()
+    {
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.ForSale, new DateOnly(2024, 1, 1), dateOfDeath: null,
+            isAbgegeben: false, Today);
+        Assert.Equal(GerbilStatus.ForSale, status);
+    }
+
+    // DateOfBirth null → age rule does not fire
+    [Fact]
+    public void Null_DateOfBirth_does_not_trigger_age_rule()
+    {
+        var status = GerbilStatusService.Derive(
+            GerbilStatus.Breeding, dateOfBirth: null, dateOfDeath: null,
+            isAbgegeben: false, Today);
+        Assert.Equal(GerbilStatus.Breeding, status);
+    }
+}

GerbilManager.Tests/LitterMortalityTests.cs

@@ -0,0 +1,88 @@
+using System.Net;
+using System.Net.Http.Json;
+using System.Text.Json;
+
+namespace GerbilManager.Tests;
+
+/// <summary>LITTER-MORTALITY: deathsWithin8Weeks field — round-trip, validation, null default.</summary>
+public class LitterMortalityTests : IClassFixture<ApiFactory>
+{
+    private readonly HttpClient _client;
+    public LitterMortalityTests(ApiFactory factory) => _client = factory.CreateClient();
+
+    private static int? GetInt(JsonElement el, string prop) =>
+        el.TryGetProperty(prop, out var v) && v.ValueKind == JsonValueKind.Number
+            ? v.GetInt32() : null;
+
+    private async Task<JsonElement> CreateAndGet(object body)
+    {
+        var post = await _client.PostAsJsonAsync("/litters", body);
+        post.EnsureSuccessStatusCode();
+        var idStr = JsonDocument.Parse(await post.Content.ReadAsStringAsync()).RootElement
+            .GetProperty("id").GetString()!;
+        return JsonDocument.Parse(await _client.GetStringAsync($"/litters/{idStr}")).RootElement;
+    }
+
+    [Fact]
+    public async Task DeathsWithin8Weeks_round_trips()
+    {
+        var el = await CreateAndGet(new
+        {
+            name = "Wurf Mortalitätstest",
+            date = "2026-05-01",
+            totalBorn = 6,
+            deathsWithin8Weeks = 2,
+        });
+        Assert.Equal(6, GetInt(el, "totalBorn"));
+        Assert.Equal(2, GetInt(el, "deathsWithin8Weeks"));
+    }
+
+    [Fact]
+    public async Task DeathsWithin8Weeks_defaults_null()
+    {
+        var el = await CreateAndGet(new { name = "Wurf Kein Mort", date = "2026-05-02" });
+        Assert.True(el.TryGetProperty("deathsWithin8Weeks", out var v));
+        Assert.Equal(JsonValueKind.Null, v.ValueKind);
+    }
+
+    [Fact]
+    public async Task DeathsWithin8Weeks_exceeding_TotalBorn_returns_400()
+    {
+        var resp = await _client.PostAsJsonAsync("/litters", new
+        {
+            name = "Ungültig",
+            date = "2026-05-03",
+            totalBorn = 4,
+            deathsWithin8Weeks = 5,
+        });
+        Assert.Equal(HttpStatusCode.BadRequest, resp.StatusCode);
+        var body = await resp.Content.ReadAsStringAsync();
+        Assert.Contains("TotalBorn", body);
+    }
+
+    [Fact]
+    public async Task Negative_DeathsWithin8Weeks_returns_400()
+    {
+        var resp = await _client.PostAsJsonAsync("/litters", new
+        {
+            name = "Negativ",
+            date = "2026-05-04",
+            deathsWithin8Weeks = -1,
+        });
+        Assert.Equal(HttpStatusCode.BadRequest, resp.StatusCode);
+        var body = await resp.Content.ReadAsStringAsync();
+        Assert.Contains("negativ", body);
+    }
+
+    [Fact]
+    public async Task DeathsWithin8Weeks_allowed_when_TotalBorn_null()
+    {
+        var el = await CreateAndGet(new
+        {
+            name = "Kein TotalBorn",
+            date = "2026-05-05",
+            deathsWithin8Weeks = 3,
+        });
+        Assert.Equal(3, GetInt(el, "deathsWithin8Weeks"));
+    }
+}

GerbilManager.Tests/PartialUpdateTests.cs

@@ -91,7 +91,7 @@ public class PartialUpdateTests : IClassFixture<ApiFactory>
         // Assert: name / genotype / originBreeder / status / externalRef all intact
         var json = JsonDocument.Parse(await _client.GetStringAsync($"/gerbils/{id}")).RootElement;
 
-        Assert.Equal("Active", GetStr(json, "status"));
+        Assert.Equal("Breeding", GetStr(json, "status"));
         Assert.Equal("Charakter-Tier", GetStr(json, "name"));
         Assert.Equal("female", GetStr(json, "gender"));
         Assert.Equal("aa CC DD ee GG PP spsp rere", GetStr(json, "genotype"));
@@ -138,7 +138,7 @@ public class PartialUpdateTests : IClassFixture<ApiFactory>
 
         var json = JsonDocument.Parse(await resp.Content.ReadAsStringAsync()).RootElement;
         Assert.Equal("Minimal", GetStr(json, "name"));
-        Assert.Equal("Active", GetStr(json, "status"));
+        Assert.Equal("Breeding", GetStr(json, "status"));
         // characterTraits defaults to [] on create when not provided
         Assert.Contains("[]", GetNested(json, "characterTraits") ?? "");
     }

GerbilManager.Tests/SearchVariationsTests.cs

@@ -16,7 +16,7 @@ public class SearchVariationsTests : IClassFixture<ApiFactory>
     private readonly HttpClient _client;
     public SearchVariationsTests(ApiFactory factory) => _client = factory.CreateClient();
 
-    private async Task Create(string name, string? originBreeder = null, string status = "Active")
+    private async Task Create(string name, string? originBreeder = null, string status = "Breeding")
     {
         var resp = await _client.PostAsJsonAsync("/gerbils",
             new { name, gender = "female", status, originBreeder });
@@ -142,7 +142,7 @@ public class SearchVariationsTests : IClassFixture<ApiFactory>
     public async Task Combined_status_and_name_filter()
     {
         await Create("KombiVerkauf", status: "ForSale");
-        await Create("KombiAktiv", status: "Active");
+        await Create("KombiAktiv", status: "Breeding");
         var hits = await Names("status==ForSale,nameSearch=*kombi");
         Assert.Contains("KombiVerkauf", hits);
         Assert.DoesNotContain("KombiAktiv", hits);

GerbilManagerWebAPI/Dtos/ApiDtos.cs

@@ -37,6 +37,7 @@ namespace GerbilManagerWebAPI.Dtos
         string Name,
         DateOnly Date,
         int? TotalBorn,
+        int? DeathsWithin8Weeks,
         Guid? FatherId,
         Guid? MotherId,
         DateOnly? ExpectedGoHomeDate,
@@ -86,6 +87,7 @@ namespace GerbilManagerWebAPI.Dtos
         string Name,
         DateOnly Date,
         int? TotalBorn,
+        int? DeathsWithin8Weeks,
         Guid? FatherId,
         Guid? MotherId,
         DateOnly? ExpectedGoHomeDate,

GerbilManagerWebAPI/Endpoints/ContractEndpoints.cs

@@ -2,6 +2,7 @@ using GerbilManagerWebAPI.Common;
 using GerbilManagerWebAPI.Contracts;
 using GerbilManagerWebAPI.Dtos;
 using GerbilManagerWebAPI.Models;
+using GerbilManagerWebAPI.Services;
 using Microsoft.AspNetCore.Http.HttpResults;
 using Microsoft.EntityFrameworkCore;
 
@@ -104,11 +105,12 @@ namespace GerbilManagerWebAPI.Endpoints
                 db.SaleContracts.Add(entity);
 
                 // Abgabe-Abschluss-Semantik: in derselben SaveChanges-Transaktion.
+                var today = DateOnly.FromDateTime(DateTime.UtcNow);
                 foreach (var g in gerbils)
                 {
                     g.ReceiverContactId = contact.Id;
                     g.GoHomeDate = input.HandoverDate;
-                    g.Status = GerbilStatus.GivenAway;
+                    GerbilStatusService.Apply(g, today);
                 }
 
                 try

GerbilManagerWebAPI/Endpoints/GerbilEndpoints.cs

@@ -1,6 +1,7 @@
 using GerbilManagerWebAPI.Common;
 using GerbilManagerWebAPI.Dtos;
 using GerbilManagerWebAPI.Models;
+using GerbilManagerWebAPI.Services;
 using Gridify;
 using Gridify.EntityFramework;
 using Microsoft.AspNetCore.Http.HttpResults;
@@ -107,7 +108,8 @@ namespace GerbilManagerWebAPI.Endpoints
         {
             if (!string.IsNullOrWhiteSpace(i.Name)) g.Name = i.Name!;
             g.Gender = i.Gender ?? (isCreate ? Gender.unknown : g.Gender);
-            g.Status = i.Status ?? (isCreate ? GerbilStatus.Active : g.Status);
+            // Status is applied as a user preference and then overridden by GerbilStatusService.
+            g.Status = i.Status ?? (isCreate ? GerbilStatus.Breeding : g.Status);
             g.LitterId = i.LitterId ?? g.LitterId;
             g.OriginContactId = i.OriginContactId ?? g.OriginContactId;
             g.ReceiverContactId = i.ReceiverContactId ?? g.ReceiverContactId;
@@ -126,6 +128,7 @@ namespace GerbilManagerWebAPI.Endpoints
             g.CharacterNote = i.CharacterNote ?? g.CharacterNote;
             g.IsDeaf = i.IsDeaf ?? g.IsDeaf;
             g.IsResident = i.IsResident ?? (isCreate ? true : g.IsResident);
+            GerbilStatusService.Apply(g, DateOnly.FromDateTime(DateTime.UtcNow));
         }
 
         internal static GerbilDto ToDto(Gerbil g, string? profilePhotoUrl = null) => new(

GerbilManagerWebAPI/Endpoints/LitterEndpoints.cs

@@ -23,10 +23,12 @@ namespace GerbilManagerWebAPI.Endpoints
                 return l is null ? TypedResults.NotFound() : TypedResults.Ok(ToDto(l));
             });
 
-            group.MapPost("/", async Task<Results<Created<LitterDto>, BadRequest<ParentGenderError>>> (LitterInput input, ApplicationContext db) =>
+            group.MapPost("/", async Task<Results<Created<LitterDto>, BadRequest<ParentGenderError>, BadRequest<string>>> (LitterInput input, ApplicationContext db) =>
             {
                 var err = await ValidateParents(db, input.FatherId, input.MotherId);
                 if (err is not null) return TypedResults.BadRequest(err);
+                var mortalityErr = ValidateMortality(input.DeathsWithin8Weeks, input.TotalBorn);
+                if (mortalityErr is not null) return TypedResults.BadRequest(mortalityErr);
 
                 var l = new Litter { Id = Guid.NewGuid(), Name = input.Name, Date = input.Date };
                 Apply(l, input);
@@ -35,12 +37,14 @@ namespace GerbilManagerWebAPI.Endpoints
                 return TypedResults.Created($"/litters/{l.Id}", ToDto(l));
             });
 
-            group.MapPut("/{id:guid}", async Task<Results<NoContent, NotFound, BadRequest<ParentGenderError>>> (Guid id, LitterInput input, ApplicationContext db) =>
+            group.MapPut("/{id:guid}", async Task<Results<NoContent, NotFound, BadRequest<ParentGenderError>, BadRequest<string>>> (Guid id, LitterInput input, ApplicationContext db) =>
             {
                 var l = await db.Litters.FirstOrDefaultAsync(x => x.Id == id);
                 if (l is null) return TypedResults.NotFound();
                 var err = await ValidateParents(db, input.FatherId, input.MotherId);
                 if (err is not null) return TypedResults.BadRequest(err);
+                var mortalityErr = ValidateMortality(input.DeathsWithin8Weeks, input.TotalBorn);
+                if (mortalityErr is not null) return TypedResults.BadRequest(mortalityErr);
                 l.Name = input.Name;
                 l.Date = input.Date;
                 Apply(l, input);
@@ -76,14 +80,25 @@ namespace GerbilManagerWebAPI.Endpoints
         private static void Apply(Litter l, LitterInput i)
         {
             l.TotalBorn = i.TotalBorn;
+            l.DeathsWithin8Weeks = i.DeathsWithin8Weeks;
             l.FatherId = i.FatherId;
             l.MotherId = i.MotherId;
             l.ExpectedGoHomeDate = i.ExpectedGoHomeDate;
             l.Notes = i.Notes;
         }
 
+        private static string? ValidateMortality(int? deaths, int? totalBorn)
+        {
+            if (deaths is null) return null;
+            if (deaths < 0) return "DeathsWithin8Weeks darf nicht negativ sein.";
+            if (totalBorn is not null && deaths > totalBorn)
+                return "DeathsWithin8Weeks darf nicht größer als TotalBorn sein.";
+            return null;
+        }
+
         private static LitterDto ToDto(Litter l) => new(
-            l.Id, l.Name, l.Date, l.TotalBorn, l.FatherId, l.MotherId, l.ExpectedGoHomeDate, l.Notes);
+            l.Id, l.Name, l.Date, l.TotalBorn, l.DeathsWithin8Weeks,
+            l.FatherId, l.MotherId, l.ExpectedGoHomeDate, l.Notes);
     }
 
     /// <summary>400 body for a father×mother gender mismatch; frontend localises by Code.</summary>

GerbilManagerWebAPI/Export/ExportService.cs

@@ -48,9 +48,11 @@ namespace GerbilManagerWebAPI.Export
 
         private static readonly Dictionary<GerbilStatus, string> StatusDe = new()
         {
-            [GerbilStatus.Active] = "Aktiv",
+            [GerbilStatus.Breeding] = "Zucht",
             [GerbilStatus.Deceased] = "Verstorben",
             [GerbilStatus.GivenAway] = "Abgegeben",
+            [GerbilStatus.ForSale] = "Abzugeben",
+            [GerbilStatus.Pet] = "Liebhaber",
         };
 
         private static readonly Dictionary<HealthRecordType, string> HealthTypeDe = new()

GerbilManagerWebAPI/Import/ImportDocxService.cs

@@ -1,5 +1,6 @@
 using System.Text.Json;
 using GerbilManagerWebAPI.Models;
+using GerbilManagerWebAPI.Services;
 using Microsoft.EntityFrameworkCore;
 
 namespace GerbilManagerWebAPI.Import
@@ -266,7 +267,7 @@ namespace GerbilManagerWebAPI.Import
                             Name              = da.Name.Trim(),
                             DateOfBirth       = animalDob,
                             Gender            = ParseGender(da.Gender),
-                            Status            = deathDate is not null ? GerbilStatus.Deceased : GerbilStatus.GivenAway,
+                            Status            = GerbilStatusService.Derive(GerbilStatus.GivenAway, animalDob, deathDate, isAbgegeben: receiverId is not null, DateOnly.FromDateTime(DateTime.UtcNow)),
                             LitterId          = litterId,
                             ReceiverContactId = receiverId,
                             GoHomeDate        = goHomeDate,

GerbilManagerWebAPI/Import/ImportService.cs

@@ -1,6 +1,7 @@
 using System.Text.Json;
 using System.Text.RegularExpressions;
 using GerbilManagerWebAPI.Models;
+using GerbilManagerWebAPI.Services;
 using Microsoft.EntityFrameworkCore;
 
 namespace GerbilManagerWebAPI.Import
@@ -390,12 +391,12 @@ namespace GerbilManagerWebAPI.Import
 
                 if (execute)
                 {
-                    _db.Gerbils.Add(new Gerbil
+                    var importedGerbil = new Gerbil
                     {
                         Id = p.Gid,
                         Name = p.A.Name,
                         Gender = p.Gender,
-                        Status = GerbilStatus.Active,
+                        Status = GerbilStatus.Breeding,
                         DateOfBirth = ParseDate(p.A.Dob),
                         DateOfDeath = ParseDate(p.A.Death),
                         LitterId = litterId,
@@ -419,7 +420,9 @@ namespace GerbilManagerWebAPI.Import
                             p.A.SourceFiles,
                             FarbschlagRaw = p.A.Farbschlag,
                         }),
-                    });
+                    };
+                    GerbilStatusService.Apply(importedGerbil, DateOnly.FromDateTime(DateTime.UtcNow));
+                    _db.Gerbils.Add(importedGerbil);
                 }
 
                 // photos

GerbilManagerWebAPI/Migrations/20260607012436_StatusModel.cs

@@ -0,0 +1,40 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace GerbilManagerWebAPI.Migrations
+{
+    /// <inheritdoc />
+    public partial class StatusModel : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            // 1) Rename string value 'Active' → 'Breeding'.
+            migrationBuilder.Sql(@"UPDATE ""Gerbils"" SET ""Status"" = 'Breeding' WHERE ""Status"" = 'Active';");
+
+            // 2) DateOfDeath set → Deceased (always takes precedence).
+            migrationBuilder.Sql(@"UPDATE ""Gerbils"" SET ""Status"" = 'Deceased' WHERE ""DateOfDeath"" IS NOT NULL;");
+
+            // 3) ReceiverContactId OR SaleContractAnimal → GivenAway (if not already Deceased).
+            migrationBuilder.Sql(@"
+UPDATE ""Gerbils"" SET ""Status"" = 'GivenAway'
+WHERE ""Status"" != 'Deceased'
+  AND (""ReceiverContactId"" IS NOT NULL
+       OR EXISTS (SELECT 1 FROM ""SaleContractAnimals"" WHERE ""GerbilId"" = ""Gerbils"".""Id""));");
+
+            // 4) Age > 7 years (presumed dead) → Deceased, but NOT overriding GivenAway.
+            migrationBuilder.Sql(@"
+UPDATE ""Gerbils"" SET ""Status"" = 'Deceased'
+WHERE ""Status"" NOT IN ('Deceased', 'GivenAway')
+  AND ""DateOfBirth"" IS NOT NULL
+  AND ""DateOfBirth"" < (CURRENT_DATE - INTERVAL '7 years');");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.Sql(@"UPDATE ""Gerbils"" SET ""Status"" = 'Active' WHERE ""Status"" = 'Breeding';");
+        }
+    }
+}

GerbilManagerWebAPI/Migrations/20260607013052_AddLitterMortality.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace GerbilManagerWebAPI.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddLitterMortality : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "DeathsWithin8Weeks",
+                table: "Litters",
+                type: "integer",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "DeathsWithin8Weeks",
+                table: "Litters");
+        }
+    }
+}

GerbilManagerWebAPI/Migrations/ApplicationContextModelSnapshot.cs

@@ -924,6 +924,9 @@ namespace GerbilManagerWebAPI.Migrations
                     b.Property<DateOnly>("Date")
                         .HasColumnType("date");
 
+                    b.Property<int?>("DeathsWithin8Weeks")
+                        .HasColumnType("integer");
+
                     b.Property<DateOnly?>("ExpectedGoHomeDate")
                         .HasColumnType("date");
 

GerbilManagerWebAPI/Models/Gerbil.cs

@@ -13,7 +13,7 @@ namespace GerbilManagerWebAPI.Models
         public Guid Id { get; set; }
         public required string Name { get; set; }
         public Gender Gender { get; set; }
-        public GerbilStatus Status { get; set; } = GerbilStatus.Active;
+        public GerbilStatus Status { get; set; } = GerbilStatus.Breeding;
 
         // Birth litter (the litter this gerbil was born in).
         public Guid? LitterId { get; set; }

GerbilManagerWebAPI/Models/GerbilStatus.cs

@@ -1,12 +1,17 @@
 namespace GerbilManagerWebAPI.Models
 {
-    /// <summary>Lifecycle status of a gerbil. Serialised as the string name on the wire.</summary>
+    /// <summary>Lifecycle status of a gerbil. Serialised as the string name on the wire.
+    /// Deceased and GivenAway are DERIVED (set by GerbilStatusService, not free-form input).
+    /// Breeding/Pet/ForSale are the user-selectable live states.</summary>
     public enum GerbilStatus
     {
-        Active = 0,
+        /// <summary>Aktiv in der Zucht (vormals "Active").</summary>
+        Breeding = 0,
         Deceased = 1,
         GivenAway = 2,
         /// <summary>Alive, at home, offered for Abgabe ("Abzugeben"). Drives FEAT-12 sale listing.</summary>
-        ForSale = 3
+        ForSale = 3,
+        /// <summary>Lebendes Heimtier, nicht in Zucht ("Liebhaber").</summary>
+        Pet = 4,
     }
 }

GerbilManagerWebAPI/Models/Litter.cs

@@ -13,6 +13,10 @@ namespace GerbilManagerWebAPI.Models
         /// <summary>Total born count (was "Strength").</summary>
         public int? TotalBorn { get; set; }
 
+        /// <summary>Frühsterblichkeit: Anzahl der in den ersten 8 Wochen verstorbenen Tiere.
+        /// Null = unbekannt (Altdaten). Must be ≤ TotalBorn if both are set.</summary>
+        public int? DeathsWithin8Weeks { get; set; }
+
         public Guid? FatherId { get; set; }
         public Gerbil? Father { get; set; }
         public Guid? MotherId { get; set; }

GerbilManagerWebAPI/Program.cs

@@ -1,5 +1,7 @@
 using System.Text.Json.Serialization;
 using GerbilManagerWebAPI.Endpoints;
+using GerbilManagerWebAPI.Models;
+using GerbilManagerWebAPI.Services;
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.EntityFrameworkCore;
 using Scalar.AspNetCore;
@@ -84,7 +86,23 @@ app.MapScalarApiReference();
 if (!app.Environment.IsEnvironment("Testing"))
 {
     using var scope = app.Services.CreateScope();
-    scope.ServiceProvider.GetRequiredService<ApplicationContext>().Database.Migrate();
+    var db = scope.ServiceProvider.GetRequiredService<ApplicationContext>();
+    db.Database.Migrate();
+
+    // Startup sweep: derive status for animals that silently crossed the 7-year threshold
+    // since the last write. No-op if all statuses are already current.
+    var today = DateOnly.FromDateTime(DateTime.UtcNow);
+    var candidates = await db.Gerbils
+        .Where(g => g.Status != GerbilStatus.Deceased && g.Status != GerbilStatus.GivenAway
+                    && g.DateOfDeath == null && g.ReceiverContactId == null
+                    && g.DateOfBirth != null
+                    && g.DateOfBirth < today.AddYears(-GerbilStatusService.MaxAgeYears))
+        .ToListAsync();
+    if (candidates.Count > 0)
+    {
+        foreach (var g in candidates) g.Status = GerbilStatus.Deceased;
+        await db.SaveChangesAsync();
+    }
 }
 
 app.UseCors(LanCorsPolicy);

GerbilManagerWebAPI/Services/GerbilStatusService.cs

@@ -0,0 +1,53 @@
+using GerbilManagerWebAPI.Models;
+
+namespace GerbilManagerWebAPI.Services
+{
+    /// <summary>
+    /// Central status-derivation logic. Every write path (create/update gerbil, SaleContract
+    /// Abgabe, import, startup sweep) calls Apply() after setting the other fields so the
+    /// derived statuses (Deceased, GivenAway) are always consistent.
+    ///
+    /// Precedence (highest wins):
+    ///   1) DateOfDeath set           → Deceased (explicit, always)
+    ///   2) Abgabe (ReceiverContactId set) → GivenAway
+    ///   3) Age > MaxAgeYears without a death date or Abgabe → Deceased (presumed)
+    ///   4) User-supplied {Breeding, Pet, ForSale}; defaults Breeding if invalid
+    ///
+    /// Age-based death is time-dependent. The stored column is kept up-to-date by:
+    ///   a) Apply() on every write (catches the animal at write time)
+    ///   b) A startup sweep in Program.cs (catches animals that silently crossed the threshold)
+    /// Gridify filters on the stored value, so status==Breeding never surfaces >7y animals.
+    /// </summary>
+    public static class GerbilStatusService
+    {
+        public const int MaxAgeYears = 7;
+
+        /// <summary>Derives and sets g.Status using the gerbil's current field values.
+        /// Must be called AFTER all other fields (DateOfDeath, ReceiverContactId, DateOfBirth)
+        /// have been applied. today = DateOnly.FromDateTime(DateTime.UtcNow).</summary>
+        public static void Apply(Gerbil g, DateOnly today)
+        {
+            g.Status = Derive(g.Status, g.DateOfBirth, g.DateOfDeath,
+                isAbgegeben: g.ReceiverContactId is not null, today);
+        }
+
+        /// <summary>Pure derivation — useful for tests and the migration backfill.</summary>
+        public static GerbilStatus Derive(
+            GerbilStatus requested,
+            DateOnly? dateOfBirth,
+            DateOnly? dateOfDeath,
+            bool isAbgegeben,
+            DateOnly today)
+        {
+            if (dateOfDeath is not null) return GerbilStatus.Deceased;
+            if (isAbgegeben) return GerbilStatus.GivenAway;
+            if (dateOfBirth is not null && IsOlderThan(dateOfBirth.Value, MaxAgeYears, today))
+                return GerbilStatus.Deceased;
+            return requested is GerbilStatus.Breeding or GerbilStatus.Pet or GerbilStatus.ForSale
+                ? requested : GerbilStatus.Breeding;
+        }
+
+        private static bool IsOlderThan(DateOnly dob, int years, DateOnly today) =>
+            today >= dob.AddYears(years);
+    }
+}

tools/import/conflict-decisions.json

@@ -162,6 +162,42 @@
       "decision": "Sterbedatum = 18.12.2020 (die 01.10.2020-Variante war falsch); Gencode war einig, taub-Flag bleibt via 'Vorhandensein gewinnt'",
       "dateOfDeath": "18.12.2020",
       "source": "Julian/Züchterin 2026-06-07 — HUMANQUESTION D7"
+    },
+    {
+      "name": "Max von Privat",
+      "dob": "01.02.2013",
+      "decision": "Genotyp von der Züchterin; Todesjahr 2014 (Jahr-only — Konvention mit Julian zu klären, deathYear NICHT als dateOfDeath gesetzt)",
+      "genotype": "aa c[chm]c[chm] D- EE GG PP spsp",
+      "_deathYear_pending": 2014,
+      "source": "Julian/Züchterin 2026-06-07 — HUMANQUESTION D7 (Jahr-only-Tod offen)"
+    },
+    {
+      "name": "Isa of Golden Lights",
+      "dob": "24.12.2014",
+      "decision": "Sterbedatum von der Züchterin (DOB-key war im extract teils leer; diese Zeile matcht die konfliktbehaftete Zeile mit dob=24.12.2014)",
+      "dateOfDeath": "21.07.2018",
+      "source": "Julian/Züchterin 2026-06-07 — HUMANQUESTION D7"
+    },
+    {
+      "name": "Jack II von den Kleinen Chaoten",
+      "dob": "14.02.2016",
+      "decision": "Sterbedatum von der Züchterin",
+      "dateOfDeath": "06.10.2019",
+      "source": "Julian/Züchterin 2026-06-07 — HUMANQUESTION D7"
+    },
+    {
+      "name": "Milon von den Kleinen Chaoten",
+      "dob": "27.11.2014",
+      "decision": "A-Locus = Aa (Quellen: Aa // aa — einziger strittiger Locus, Züchterin löst auf Aa); alle anderen Loci waren einig",
+      "genotype": "Aa Cc[chm] D- ee[f] gg Pp spsp",
+      "source": "Julian/Züchterin 2026-06-07 — HUMANQUESTION D7"
+    },
+    {
+      "name": "Sunny von PZ Karl",
+      "dob": "10.04.2014",
+      "decision": "Sterbedatum von der Züchterin; bestätigt = 'von PZ Karl' (nicht 'Sunny Sky of Fiomi')",
+      "dateOfDeath": "30.04.2018",
+      "source": "Julian/Züchterin 2026-06-07 — HUMANQUESTION D7 (Nachtrag)"
     }
   ]
 }