Add multi-WO dispatch support with junction table

- DispatchWorkOrder junction table for 1:N dispatch-to-WO relationship
- Make Dispatch.WorkOrderId nullable (backward compat)
- Add AcceptToken and AcknowledgedAt to Dispatch model
- Dispatch_DTO accepts WorkOrderIds array
- DispatchToVendor creates junction rows, email lists all WOs in table
- GetDispatches queries both junction table and direct FK
- GetDispatchById includes workOrders list from junction table
- Migration with DispatchWorkOrder table

Api.SeaHavenIndustries/Controllers/WorkOrderController.cs

@@ -1031,10 +1031,13 @@ namespace Api.SeaHavenIndustries.Controllers
         {
             try
             {
-                var workOrder = await _db.workOrders.Include(w => w.Locations)
-                    .FirstOrDefaultAsync(w => w.Id == model.WorkOrderId);
-                if (workOrder == null)
-                    return BadRequest(new Response { Status = "Error", Message = "Work order not found" });
+                var workOrders = await _db.workOrders.Include(w => w.Locations)
+                    .Where(w => model.WorkOrderIds.Contains(w.Id))
+                    .ToListAsync();
+                if (workOrders.Count == 0)
+                    return BadRequest(new Response { Status = "Error", Message = "No work orders found" });
+
+                var primaryWO = workOrders.First();
 
                 var lastPO = await _db.Dispatches
                     .Where(d => d.PONumber != null)
@@ -1069,11 +1072,11 @@ namespace Api.SeaHavenIndustries.Controllers
                     var dispatchNumber = $"DSP-{nextDSP:D5}";
                     nextDSP++;
 
-                    var replyTo = $"wo-{workOrder.InternalWONumber}-{dispatchNumber}@int.seahaven.com";
+                    var replyTo = $"wo-{primaryWO.InternalWONumber}-{dispatchNumber}@int.seahaven.com";
 
                     var dispatch = new Dispatch
                     {
-                        WorkOrderId = model.WorkOrderId,
+                        WorkOrderId = primaryWO.Id,
                         VendorId = vendorId,
                         DispatchNumber = dispatchNumber,
                         PONumber = poNumber,
@@ -1082,50 +1085,60 @@ namespace Api.SeaHavenIndustries.Controllers
                         Status = "Sent",
                         ScheduledDate = model.ScheduledDate,
                         DispatchedAt = DateTime.UtcNow,
-                        ReplyToAddress = replyTo
+                        ReplyToAddress = replyTo,
+                        AcceptToken = Guid.NewGuid().ToString(),
+                        DispatchWorkOrders = workOrders.Select(wo => new DispatchWorkOrder { WorkOrderId = wo.Id }).ToList()
                     };
 
-                    var subject = $"[WO-{workOrder.InternalWONumber}-{dispatchNumber}] {workOrder.WorkerOrderTitle}";
-                    var locationName = workOrder.Locations?.Name ?? "";
-                    var locationAddr = workOrder.Locations?.Address ?? "";
+                    var woListHtml = string.Join("", workOrders.Select(wo =>
+                        $"<tr><td style='padding:6px 8px;border:1px solid #ddd;'>{wo.InternalWONumber}</td>" +
+                        $"<td style='padding:6px 8px;border:1px solid #ddd;'>{wo.WorkerOrderTitle}</td>" +
+                        $"<td style='padding:6px 8px;border:1px solid #ddd;'>{wo.Priority}</td>" +
+                        $"<td style='padding:6px 8px;border:1px solid #ddd;'>{wo.DueDate?.ToString("yyyy-MM-dd") ?? "N/A"}</td></tr>"));
+
+                    var locationName = primaryWO.Locations?.Name ?? "";
+                    var locationAddr = primaryWO.Locations?.Address ?? "";
+                    var subject = $"[{dispatchNumber}] {(workOrders.Count > 1 ? $"{workOrders.Count} Work Orders" : primaryWO.WorkerOrderTitle)} at {locationName}";
 
                     var html = $@"
-                        <h2>Work Order Dispatch</h2>
+                        <h2>Work Order Dispatch — {dispatchNumber}</h2>
+                        <p><strong>Location:</strong> {locationName} {locationAddr}</p>
+                        <p><strong>Vendor PO:</strong> {poNumber} &nbsp; <strong>NTE:</strong> ${model.NTEAmount?.ToString("F2") ?? "N/A"}</p>
+                        <h3>Work Orders</h3>
                         <table style='border-collapse:collapse;width:100%;font-family:Arial,sans-serif;'>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>WO Number</td><td style='padding:8px;border:1px solid #ddd;'>{workOrder.InternalWONumber}</td></tr>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>Title</td><td style='padding:8px;border:1px solid #ddd;'>{workOrder.WorkerOrderTitle}</td></tr>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>Location</td><td style='padding:8px;border:1px solid #ddd;'>{locationName} {locationAddr}</td></tr>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>Priority</td><td style='padding:8px;border:1px solid #ddd;'>{workOrder.Priority}</td></tr>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>Due Date</td><td style='padding:8px;border:1px solid #ddd;'>{workOrder.DueDate?.ToString("yyyy-MM-dd") ?? "N/A"}</td></tr>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>Trade</td><td style='padding:8px;border:1px solid #ddd;'>{workOrder.Trade}</td></tr>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>Sub-Trade</td><td style='padding:8px;border:1px solid #ddd;'>{workOrder.SubTrade}</td></tr>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>Problem</td><td style='padding:8px;border:1px solid #ddd;'>{workOrder.Problem}</td></tr>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>NTE</td><td style='padding:8px;border:1px solid #ddd;'>${model.NTEAmount?.ToString("F2") ?? "N/A"}</td></tr>
-                            <tr><td style='padding:8px;font-weight:bold;border:1px solid #ddd;'>Vendor PO</td><td style='padding:8px;border:1px solid #ddd;'>{poNumber}</td></tr>
+                            <tr style='background:#f5f5f5;'>
+                                <th style='padding:6px 8px;border:1px solid #ddd;text-align:left;'>WO #</th>
+                                <th style='padding:6px 8px;border:1px solid #ddd;text-align:left;'>Title</th>
+                                <th style='padding:6px 8px;border:1px solid #ddd;text-align:left;'>Priority</th>
+                                <th style='padding:6px 8px;border:1px solid #ddd;text-align:left;'>Due Date</th>
+                            </tr>
+                            {woListHtml}
                         </table>
                         <h3>Description</h3>
-                        <p>{model.Description ?? workOrder.Description}</p>
-                        <hr/>
+                        <p>{model.Description ?? primaryWO.Description}</p>
                         <br/><p style='color:#666;font-size:13px;'>{senderName}<br/>Sea Haven Industries</p>
-                        <hr/><p style='color:#999;font-size:12px;'>Reply to this email to communicate about this work order.</p>";
+                        <hr/><p style='color:#999;font-size:12px;'>Reply to this email to communicate about this dispatch.</p>";
 
                     var emailSent = await _sendMessage.SendDispatchEmail(vendor.Email, subject, html, replyTo);
                     dispatch.EmailSent = emailSent;
 
                     _db.Dispatches.Add(dispatch);
 
-                    _db.WorkOrderAuditLogs.Add(new WorkOrderAuditLog
+                    foreach (var wo in workOrders)
                     {
-                        WorkOrderId = model.WorkOrderId,
-                        UserId = userId,
-                        FieldName = "Dispatch",
-                        OldValue = "",
-                        NewValue = $"{vendor.CompanyName} ({poNumber})",
-                        Action = "dispatch",
-                        CreatedAt = DateTime.UtcNow
-                    });
+                        _db.WorkOrderAuditLogs.Add(new WorkOrderAuditLog
+                        {
+                            WorkOrderId = wo.Id,
+                            UserId = userId,
+                            FieldName = "Dispatch",
+                            OldValue = "",
+                            NewValue = $"{vendor.CompanyName} ({dispatchNumber})",
+                            Action = "dispatch",
+                            CreatedAt = DateTime.UtcNow
+                        });
+                    }
 
-                    dispatches.Add(new { dispatch.Id, dispatchNumber, poNumber, vendorName = vendor.CompanyName, dispatch.Status });
+                    dispatches.Add(new { dispatch.Id, dispatchNumber, poNumber, vendorName = vendor.CompanyName, dispatch.Status, workOrderCount = workOrders.Count });
                 }
 
                 await _db.SaveChangesAsync();
@@ -1140,8 +1153,21 @@ namespace Api.SeaHavenIndustries.Controllers
         [HttpGet("GetDispatches/{workOrderId}")]
         public async Task<IActionResult> GetDispatches(int workOrderId)
         {
-            var data = await _db.Dispatches
+            var dispatchIds = await _db.DispatchWorkOrders
+                .Where(dwo => dwo.WorkOrderId == workOrderId)
+                .Select(dwo => dwo.DispatchId)
+                .Distinct()
+                .ToListAsync();
+
+            var directIds = await _db.Dispatches
                 .Where(d => d.WorkOrderId == workOrderId)
+                .Select(d => d.Id)
+                .ToListAsync();
+
+            var allIds = dispatchIds.Union(directIds).Distinct().ToList();
+
+            var data = await _db.Dispatches
+                .Where(d => allIds.Contains(d.Id))
                 .Include(d => d.Vendor)
                 .OrderByDescending(d => d.DispatchedAt)
                 .Select(d => new
@@ -1184,11 +1210,19 @@ namespace Api.SeaHavenIndustries.Controllers
                     x.DispatchedAt,
                     x.EmailSent,
                     x.WorkOrderId,
+                    x.AcknowledgedAt,
                     woNumber = x.WorkOrder != null ? x.WorkOrder.InternalWONumber : "",
                     woTitle = x.WorkOrder != null ? x.WorkOrder.WorkerOrderTitle : "",
                     vendorName = x.Vendor != null ? x.Vendor.CompanyName : "",
                     vendorEmail = x.Vendor != null ? x.Vendor.Email : "",
                     vendorId = x.VendorId,
+                    workOrders = _db.DispatchWorkOrders
+                        .Where(dwo => dwo.DispatchId == x.Id)
+                        .Select(dwo => new {
+                            dwo.WorkOrderId,
+                            woNumber = dwo.WorkOrder != null ? dwo.WorkOrder.InternalWONumber : "",
+                            woTitle = dwo.WorkOrder != null ? dwo.WorkOrder.WorkerOrderTitle : ""
+                        }).ToList(),
                     comments = _db.Comments
                         .Where(c => c.DispatchId == x.Id)
                         .OrderBy(c => c.CreatedDate)
@@ -1223,7 +1257,7 @@ namespace Api.SeaHavenIndustries.Controllers
                 {
                     _db.WorkOrderAuditLogs.Add(new WorkOrderAuditLog
                     {
-                        WorkOrderId = dispatch.WorkOrderId,
+                        WorkOrderId = dispatch.WorkOrderId ?? 0,
                         UserId = userId,
                         FieldName = $"Dispatch {dispatch.DispatchNumber} Status",
                         OldValue = dispatch.Status ?? "",

Api.SeaHavenIndustries/DTOs/Dispatch_DTO.cs

@@ -2,7 +2,7 @@ namespace Api.SeaHavenIndustries.DTOs
 {
     public class Dispatch_DTO
     {
-        public int WorkOrderId { get; set; }
+        public List<int> WorkOrderIds { get; set; } = new();
         public List<int> VendorIds { get; set; } = new();
         public decimal? NTEAmount { get; set; }
         public DateTime? ScheduledDate { get; set; }

Data.SeaHavenIndustries/Auth/ApplicationDbContext.cs

@@ -41,6 +41,7 @@ namespace Data.SeaHavenIndustries
         public DbSet<DropdownOption> DropdownOptions { get; set; }
         public DbSet<Vendor> Vendors { get; set; }
         public DbSet<Dispatch> Dispatches { get; set; }
+        public DbSet<DispatchWorkOrder> DispatchWorkOrders { get; set; }
         public DbSet<TaskListTemplate> TaskListTemplates { get; set; }
         public DbSet<TaskListTemplateItem> TaskListTemplateItems { get; set; }
 

Data.SeaHavenIndustries/Migrations/20260417190743_MultiWODispatch.cs

@@ -0,0 +1,96 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Data.SeaHavenIndustries.Migrations
+{
+    /// <inheritdoc />
+    public partial class MultiWODispatch : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<int>(
+                name: "WorkOrderId",
+                table: "Dispatches",
+                type: "int",
+                nullable: true,
+                oldClrType: typeof(int),
+                oldType: "int");
+
+            migrationBuilder.AddColumn<string>(
+                name: "AcceptToken",
+                table: "Dispatches",
+                type: "nvarchar(max)",
+                nullable: true);
+
+            migrationBuilder.AddColumn<DateTime>(
+                name: "AcknowledgedAt",
+                table: "Dispatches",
+                type: "datetime2",
+                nullable: true);
+
+            migrationBuilder.CreateTable(
+                name: "DispatchWorkOrders",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "int", nullable: false)
+                        .Annotation("SqlServer:Identity", "1, 1"),
+                    DispatchId = table.Column<int>(type: "int", nullable: false),
+                    WorkOrderId = table.Column<int>(type: "int", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_DispatchWorkOrders", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_DispatchWorkOrders_Dispatches_DispatchId",
+                        column: x => x.DispatchId,
+                        principalTable: "Dispatches",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_DispatchWorkOrders_workOrders_WorkOrderId",
+                        column: x => x.WorkOrderId,
+                        principalTable: "workOrders",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_DispatchWorkOrders_DispatchId",
+                table: "DispatchWorkOrders",
+                column: "DispatchId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_DispatchWorkOrders_WorkOrderId",
+                table: "DispatchWorkOrders",
+                column: "WorkOrderId");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "DispatchWorkOrders");
+
+            migrationBuilder.DropColumn(
+                name: "AcceptToken",
+                table: "Dispatches");
+
+            migrationBuilder.DropColumn(
+                name: "AcknowledgedAt",
+                table: "Dispatches");
+
+            migrationBuilder.AlterColumn<int>(
+                name: "WorkOrderId",
+                table: "Dispatches",
+                type: "int",
+                nullable: false,
+                defaultValue: 0,
+                oldClrType: typeof(int),
+                oldType: "int",
+                oldNullable: true);
+        }
+    }
+}

Data.SeaHavenIndustries/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -640,6 +640,12 @@ namespace Data.SeaHavenIndustries.Migrations
 
                     SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
 
+                    b.Property<string>("AcceptToken")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<DateTime?>("AcknowledgedAt")
+                        .HasColumnType("datetime2");
+
                     b.Property<DateTime?>("CompletedDate")
                         .HasColumnType("datetime2");
 
@@ -691,7 +697,7 @@ namespace Data.SeaHavenIndustries.Migrations
                     b.Property<int>("VendorId")
                         .HasColumnType("int");
 
-                    b.Property<int>("WorkOrderId")
+                    b.Property<int?>("WorkOrderId")
                         .HasColumnType("int");
 
                     b.Property<string>("createdby")
@@ -706,6 +712,29 @@ namespace Data.SeaHavenIndustries.Migrations
                     b.ToTable("Dispatches");
                 });
 
+            modelBuilder.Entity("Data.SeaHavenIndustries.DispatchWorkOrder", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("DispatchId")
+                        .HasColumnType("int");
+
+                    b.Property<int>("WorkOrderId")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("DispatchId");
+
+                    b.HasIndex("WorkOrderId");
+
+                    b.ToTable("DispatchWorkOrders");
+                });
+
             modelBuilder.Entity("Data.SeaHavenIndustries.DropdownOption", b =>
                 {
                     b.Property<int>("Id")
@@ -2181,10 +2210,28 @@ namespace Data.SeaHavenIndustries.Migrations
                     b.HasOne("Data.SeaHavenIndustries.WorkOrder", "WorkOrder")
                         .WithMany("Dispatches")
                         .HasForeignKey("WorkOrderId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("Vendor");
+
+                    b.Navigation("WorkOrder");
+                });
+
+            modelBuilder.Entity("Data.SeaHavenIndustries.DispatchWorkOrder", b =>
+                {
+                    b.HasOne("Data.SeaHavenIndustries.Dispatch", "Dispatch")
+                        .WithMany("DispatchWorkOrders")
+                        .HasForeignKey("DispatchId")
                         .OnDelete(DeleteBehavior.Restrict)
                         .IsRequired();
 
-                    b.Navigation("Vendor");
+                    b.HasOne("Data.SeaHavenIndustries.WorkOrder", "WorkOrder")
+                        .WithMany()
+                        .HasForeignKey("WorkOrderId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Dispatch");
 
                     b.Navigation("WorkOrder");
                 });
@@ -2542,6 +2589,8 @@ namespace Data.SeaHavenIndustries.Migrations
             modelBuilder.Entity("Data.SeaHavenIndustries.Dispatch", b =>
                 {
                     b.Navigation("Comments");
+
+                    b.Navigation("DispatchWorkOrders");
                 });
 
             modelBuilder.Entity("Data.SeaHavenIndustries.Employee", b =>

Data.SeaHavenIndustries/Models/Dispatch.cs

@@ -4,7 +4,7 @@ namespace Data.SeaHavenIndustries
 {
     public class Dispatch : FullAuditEntity
     {
-        public int WorkOrderId { get; set; }
+        public int? WorkOrderId { get; set; }
         [ForeignKey(nameof(WorkOrderId))]
         public virtual WorkOrder? WorkOrder { get; set; }
 
@@ -20,8 +20,11 @@ namespace Data.SeaHavenIndustries
         public DateTime? ScheduledDate { get; set; }
         public DateTime? CompletedDate { get; set; }
         public DateTime? DispatchedAt { get; set; }
+        public DateTime? AcknowledgedAt { get; set; }
         public bool EmailSent { get; set; }
         public string? ReplyToAddress { get; set; }
+        public string? AcceptToken { get; set; }
         public ICollection<Comments>? Comments { get; set; }
+        public ICollection<DispatchWorkOrder>? DispatchWorkOrders { get; set; }
     }
 }

Data.SeaHavenIndustries/Models/DispatchWorkOrder.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Data.SeaHavenIndustries
+{
+    public class DispatchWorkOrder
+    {
+        public int Id { get; set; }
+        public int DispatchId { get; set; }
+        [ForeignKey(nameof(DispatchId))]
+        public virtual Dispatch? Dispatch { get; set; }
+        public int WorkOrderId { get; set; }
+        [ForeignKey(nameof(WorkOrderId))]
+        public virtual WorkOrder? WorkOrder { get; set; }
+    }
+}