feat(import): resolve color variety ID mappings mismatch, support unnamed parents in virtual litters, and implement SaleContract updates

GerbilManagerWebAPI/Migrations/20260613114528_MakeLitterDateNullable.cs

@@ -0,0 +1,37 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace GerbilManagerWebAPI.Migrations
+{
+    /// <inheritdoc />
+    public partial class MakeLitterDateNullable : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<DateOnly>(
+                name: "Date",
+                table: "Litters",
+                type: "date",
+                nullable: true,
+                oldClrType: typeof(DateOnly),
+                oldType: "date");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<DateOnly>(
+                name: "Date",
+                table: "Litters",
+                type: "date",
+                nullable: false,
+                defaultValue: new DateOnly(1, 1, 1),
+                oldClrType: typeof(DateOnly),
+                oldType: "date",
+                oldNullable: true);
+        }
+    }
+}

GerbilManagerWebAPI/Migrations/20260613120908_AddContractAnimalPhoto.cs

@@ -0,0 +1,29 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace GerbilManagerWebAPI.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddContractAnimalPhoto : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<Guid>(
+                name: "PhotoId",
+                table: "SaleContractAnimal",
+                type: "uuid",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "PhotoId",
+                table: "SaleContractAnimal");
+        }
+    }
+}

GerbilManagerWebAPI/Migrations/ApplicationContextModelSnapshot.cs

@@ -970,7 +970,7 @@ namespace GerbilManagerWebAPI.Migrations
                         .ValueGeneratedOnAdd()
                         .HasColumnType("uuid");
 
-                    b.Property<DateOnly>("Date")
+                    b.Property<DateOnly?>("Date")
                         .HasColumnType("date");
 
                     b.Property<int?>("DeathsWithin8Weeks")
@@ -1271,6 +1271,9 @@ namespace GerbilManagerWebAPI.Migrations
                     b.Property<Guid>("GerbilId")
                         .HasColumnType("uuid");
 
+                    b.Property<Guid?>("PhotoId")
+                        .HasColumnType("uuid");
+
                     b.HasKey("SaleContractId", "GerbilId");
 
                     b.HasIndex("GerbilId");