feat: Support multi-material project parts

Each project part now references its own material, allowing a single
project to use multiple material types. Removes ProjectStockBin entity
since stock is now derived from material stock lengths.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CutList.Web/Data/Entities/Material.cs

@@ -11,7 +11,8 @@ public class Material
     public DateTime? UpdatedAt { get; set; }
 
     public ICollection<SupplierStock> SupplierStocks { get; set; } = new List<SupplierStock>();
-    public ICollection<Project> Projects { get; set; } = new List<Project>();
+    public ICollection<MaterialStockLength> StockLengths { get; set; } = new List<MaterialStockLength>();
+    public ICollection<ProjectPart> ProjectParts { get; set; } = new List<ProjectPart>();
 
     public string DisplayName => $"{Shape} - {Size}";
 }

CutList.Web/Data/Entities/ProjectPart.cs

@@ -4,10 +4,12 @@ public class ProjectPart
 {
     public int Id { get; set; }
     public int ProjectId { get; set; }
+    public int MaterialId { get; set; }
     public string Name { get; set; } = string.Empty;
     public decimal LengthInches { get; set; }
     public int Quantity { get; set; } = 1;
     public int SortOrder { get; set; }
 
     public Project Project { get; set; } = null!;
+    public Material Material { get; set; } = null!;
 }

CutList.Web/Data/Entities/ProjectStockBin.cs

@@ -1,13 +0,0 @@
-namespace CutList.Web.Data.Entities;
-
-public class ProjectStockBin
-{
-    public int Id { get; set; }
-    public int ProjectId { get; set; }
-    public decimal LengthInches { get; set; }
-    public int Quantity { get; set; } = -1;
-    public int Priority { get; set; } = 25;
-    public int SortOrder { get; set; }
-
-    public Project Project { get; set; } = null!;
-}

CutList.Web/Migrations/20260202043251_MultiMaterialProjectParts.Designer.cs

@@ -0,0 +1,394 @@
+// <auto-generated />
+using System;
+using CutList.Web.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace CutList.Web.Migrations
+{
+    [DbContext(typeof(ApplicationDbContext))]
+    [Migration("20260202043251_MultiMaterialProjectParts")]
+    partial class MultiMaterialProjectParts
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.11")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder);
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.CuttingTool", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<bool>("IsDefault")
+                        .HasColumnType("bit");
+
+                    b.Property<decimal>("KerfInches")
+                        .HasPrecision(6, 4)
+                        .HasColumnType("decimal(6,4)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("CuttingTools");
+
+                    b.HasData(
+                        new
+                        {
+                            Id = 1,
+                            IsActive = true,
+                            IsDefault = true,
+                            KerfInches = 0.0625m,
+                            Name = "Bandsaw"
+                        },
+                        new
+                        {
+                            Id = 2,
+                            IsActive = true,
+                            IsDefault = false,
+                            KerfInches = 0.125m,
+                            Name = "Chop Saw"
+                        },
+                        new
+                        {
+                            Id = 3,
+                            IsActive = true,
+                            IsDefault = false,
+                            KerfInches = 0.0625m,
+                            Name = "Cold Cut Saw"
+                        },
+                        new
+                        {
+                            Id = 4,
+                            IsActive = true,
+                            IsDefault = false,
+                            KerfInches = 0.0625m,
+                            Name = "Hacksaw"
+                        });
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Material", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(255)
+                        .HasColumnType("nvarchar(255)");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("Shape")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.Property<string>("Size")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Materials");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.MaterialStockLength", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<decimal>("LengthInches")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("decimal(10,4)");
+
+                    b.Property<int>("MaterialId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Notes")
+                        .HasMaxLength(255)
+                        .HasColumnType("nvarchar(255)");
+
+                    b.Property<int>("Quantity")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MaterialId", "LengthInches")
+                        .IsUnique();
+
+                    b.ToTable("MaterialStockLengths");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Project", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<string>("Customer")
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<int?>("CuttingToolId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<string>("Notes")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CuttingToolId");
+
+                    b.ToTable("Projects");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.ProjectPart", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<decimal>("LengthInches")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("decimal(10,4)");
+
+                    b.Property<int>("MaterialId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<int>("ProjectId")
+                        .HasColumnType("int");
+
+                    b.Property<int>("Quantity")
+                        .HasColumnType("int");
+
+                    b.Property<int>("SortOrder")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MaterialId");
+
+                    b.HasIndex("ProjectId");
+
+                    b.ToTable("ProjectParts");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Supplier", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("ContactInfo")
+                        .HasMaxLength(500)
+                        .HasColumnType("nvarchar(500)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<string>("Notes")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Suppliers");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.SupplierStock", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<decimal>("LengthInches")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("decimal(10,4)");
+
+                    b.Property<int>("MaterialId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Notes")
+                        .HasMaxLength(255)
+                        .HasColumnType("nvarchar(255)");
+
+                    b.Property<decimal?>("Price")
+                        .HasPrecision(10, 2)
+                        .HasColumnType("decimal(10,2)");
+
+                    b.Property<int>("SupplierId")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MaterialId");
+
+                    b.HasIndex("SupplierId", "MaterialId", "LengthInches")
+                        .IsUnique();
+
+                    b.ToTable("SupplierStocks");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.MaterialStockLength", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.Material", "Material")
+                        .WithMany("StockLengths")
+                        .HasForeignKey("MaterialId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Material");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Project", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.CuttingTool", "CuttingTool")
+                        .WithMany("Projects")
+                        .HasForeignKey("CuttingToolId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.Navigation("CuttingTool");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.ProjectPart", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.Material", "Material")
+                        .WithMany("ProjectParts")
+                        .HasForeignKey("MaterialId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("CutList.Web.Data.Entities.Project", "Project")
+                        .WithMany("Parts")
+                        .HasForeignKey("ProjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Material");
+
+                    b.Navigation("Project");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.SupplierStock", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.Material", "Material")
+                        .WithMany("SupplierStocks")
+                        .HasForeignKey("MaterialId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("CutList.Web.Data.Entities.Supplier", "Supplier")
+                        .WithMany("Stocks")
+                        .HasForeignKey("SupplierId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Material");
+
+                    b.Navigation("Supplier");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.CuttingTool", b =>
+                {
+                    b.Navigation("Projects");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Material", b =>
+                {
+                    b.Navigation("ProjectParts");
+
+                    b.Navigation("StockLengths");
+
+                    b.Navigation("SupplierStocks");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Project", b =>
+                {
+                    b.Navigation("Parts");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Supplier", b =>
+                {
+                    b.Navigation("Stocks");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

CutList.Web/Migrations/20260202043251_MultiMaterialProjectParts.cs

@@ -0,0 +1,143 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace CutList.Web.Migrations
+{
+    /// <inheritdoc />
+    public partial class MultiMaterialProjectParts : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Projects_Materials_MaterialId",
+                table: "Projects");
+
+            migrationBuilder.DropTable(
+                name: "ProjectStockBins");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Projects_MaterialId",
+                table: "Projects");
+
+            migrationBuilder.DropColumn(
+                name: "MaterialId",
+                table: "Projects");
+
+            migrationBuilder.AlterColumn<string>(
+                name: "Customer",
+                table: "Projects",
+                type: "nvarchar(100)",
+                maxLength: 100,
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(max)",
+                oldNullable: true);
+
+            migrationBuilder.AddColumn<int>(
+                name: "MaterialId",
+                table: "ProjectParts",
+                type: "int",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.AddColumn<int>(
+                name: "Quantity",
+                table: "MaterialStockLengths",
+                type: "int",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ProjectParts_MaterialId",
+                table: "ProjectParts",
+                column: "MaterialId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ProjectParts_Materials_MaterialId",
+                table: "ProjectParts",
+                column: "MaterialId",
+                principalTable: "Materials",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_ProjectParts_Materials_MaterialId",
+                table: "ProjectParts");
+
+            migrationBuilder.DropIndex(
+                name: "IX_ProjectParts_MaterialId",
+                table: "ProjectParts");
+
+            migrationBuilder.DropColumn(
+                name: "MaterialId",
+                table: "ProjectParts");
+
+            migrationBuilder.DropColumn(
+                name: "Quantity",
+                table: "MaterialStockLengths");
+
+            migrationBuilder.AlterColumn<string>(
+                name: "Customer",
+                table: "Projects",
+                type: "nvarchar(max)",
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(100)",
+                oldMaxLength: 100,
+                oldNullable: true);
+
+            migrationBuilder.AddColumn<int>(
+                name: "MaterialId",
+                table: "Projects",
+                type: "int",
+                nullable: true);
+
+            migrationBuilder.CreateTable(
+                name: "ProjectStockBins",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "int", nullable: false)
+                        .Annotation("SqlServer:Identity", "1, 1"),
+                    ProjectId = table.Column<int>(type: "int", nullable: false),
+                    LengthInches = table.Column<decimal>(type: "decimal(10,4)", precision: 10, scale: 4, nullable: false),
+                    Priority = table.Column<int>(type: "int", nullable: false),
+                    Quantity = table.Column<int>(type: "int", nullable: false),
+                    SortOrder = table.Column<int>(type: "int", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ProjectStockBins", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_ProjectStockBins_Projects_ProjectId",
+                        column: x => x.ProjectId,
+                        principalTable: "Projects",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Projects_MaterialId",
+                table: "Projects",
+                column: "MaterialId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ProjectStockBins_ProjectId",
+                table: "ProjectStockBins",
+                column: "ProjectId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Projects_Materials_MaterialId",
+                table: "Projects",
+                column: "MaterialId",
+                principalTable: "Materials",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.SetNull);
+        }
+    }
+}