Propagate catalog price to inventory and quote at current price

Quotes now reflect the current catalog price instead of a tenant's stale
typed-in cost, without disturbing accounting.

- InventoryItem gains CatalogReferencePrice + CatalogPriceUpdatedAt: the
  QUOTING price (current replacement cost), kept separate from UnitCost/
  AverageCost (the cost basis that drives valuation/COGS).
- The catalog sync (PowderCatalogUpsertService.PropagateToLinkedInventoryAsync,
  run at the end of every upsert) refreshes linked inventory items with the
  catalog's current price and product data (description, cure, SDS/TDS, color
  families, coverage, SG, transfer eff, requires-clear-coat). It NEVER touches
  cost, quantity, notes, image, location, or stock levels, and never nulls a
  tenant value with a catalog null. EF persists only actual changes.
- CatalogReferencePrice is also set at link time (catalog receive, incoming-
  from-catalog, identity match on create) so a freshly added powder quotes at
  the current price immediately.
- Pricing now uses CatalogReferencePrice ?? UnitCost: the quote/job powder
  pickers and PricingCalculationService (in-stock usage and powder-to-order
  billing). Falls back to UnitCost for non-catalog/manual powders, so nothing
  regresses. One current price for the whole quantity — no on-hand/to-order
  split. Per-coat snapshot still locks the price at quote creation.

Tests: propagation updates reference price + specs but not cost/qty/notes/
image, and skips a $0 catalog price. Full suite 276 green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/PowderCoating.Application/Services/PricingCalculationService.cs

@@ -149,9 +149,12 @@ public class PricingCalculationService : IPricingCalculationService
             try
             {
                 var inventoryItem = await _unitOfWork.InventoryItems.GetByIdAsync(coat.InventoryItemId.Value);
-                if (inventoryItem != null && inventoryItem.UnitCost > 0)
+                // Prefer the current catalog price (replacement cost) so quotes reflect the latest
+                // price; fall back to the item's own cost when it isn't catalog-linked.
+                var effectiveCostPerLb = inventoryItem?.CatalogReferencePrice ?? inventoryItem?.UnitCost ?? 0m;
+                if (inventoryItem != null && effectiveCostPerLb > 0)
                 {
-                    costPerLb = inventoryItem.UnitCost;
+                    costPerLb = effectiveCostPerLb;
                     isIncomingPowder = inventoryItem.IsIncoming;
                     var coverage = coat.CoverageSqFtPerLb;
                     var transferEfficiency = coat.TransferEfficiency;
@@ -160,8 +163,8 @@ public class PricingCalculationService : IPricingCalculationService
                     var actualPoundsPerSqFt = poundsPerSqFt / (transferEfficiency / 100m);
                     powderCostPerSqFt = actualPoundsPerSqFt * costPerLb;
 
-                    _logger.LogInformation("Coat {CoatName}: Using inventory item: {InventoryItem} (IsIncoming={IsIncoming}), UnitCost={UnitCost}/lb, Coverage={Coverage}sqft/lb, Efficiency={Efficiency}%, Calculated={CalcCost}/sqft",
+                    _logger.LogInformation("Coat {CoatName}: Using inventory item: {InventoryItem} (IsIncoming={IsIncoming}), CostPerLb={CostPerLb}/lb (catalog ref={CatalogRef}), Coverage={Coverage}sqft/lb, Efficiency={Efficiency}%, Calculated={CalcCost}/sqft",
-                        coat.CoatName, inventoryItem.Name, isIncomingPowder, inventoryItem.UnitCost, coverage, transferEfficiency, powderCostPerSqFt);
+                        coat.CoatName, inventoryItem.Name, isIncomingPowder, costPerLb, inventoryItem.CatalogReferencePrice, coverage, transferEfficiency, powderCostPerSqFt);
                 }
             }
             catch (Exception ex)
@@ -691,7 +694,8 @@ public class PricingCalculationService : IPricingCalculationService
                         var invItem = await _unitOfWork.InventoryItems.GetByIdAsync(c.InventoryItemId.Value);
                         if (invItem?.IsIncoming == true)
                         {
-                            customPowderOrderAmount += c.PowderToOrder.Value * invItem.UnitCost;
+                            // Bill the powder-to-order at the current catalog price when linked.
+                            customPowderOrderAmount += c.PowderToOrder.Value * (invItem.CatalogReferencePrice ?? invItem.UnitCost);
                             var colorName = !string.IsNullOrWhiteSpace(c.ColorName) ? c.ColorName : invItem.Name;
                             if (!string.IsNullOrWhiteSpace(colorName))
                                 customPowderOrderColors.Add(colorName);

src/PowderCoating.Core/Entities/InventoryItem.cs

@@ -40,6 +40,18 @@ public class InventoryItem : BaseEntity
     /// </summary>
     public int? PowderCatalogItemId { get; set; }
 
+    /// <summary>
+    /// Latest list price from the linked powder catalog, refreshed by the catalog sync. This is the
+    /// QUOTING price (current replacement cost) and is kept deliberately SEPARATE from
+    /// <see cref="UnitCost"/>/<see cref="AverageCost"/> (the actual paid cost basis that drives
+    /// inventory valuation and COGS). Quoting prefers this when present so quotes reflect the
+    /// current price; accounting never reads it. Null for manual/non-catalog powders.
+    /// </summary>
+    public decimal? CatalogReferencePrice { get; set; }
+
+    /// <summary>Timestamp (UTC) when <see cref="CatalogReferencePrice"/> was last refreshed by the sync.</summary>
+    public DateTime? CatalogPriceUpdatedAt { get; set; }
+
     // Sample Panel Tracking (coating category items only)
     public bool HasSamplePanel { get; set; } = false;
 

src/PowderCoating.Infrastructure/Migrations/20260617192646_AddInventoryCatalogReferencePrice.cs

@@ -0,0 +1,81 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace PowderCoating.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddInventoryCatalogReferencePrice : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<DateTime>(
+                name: "CatalogPriceUpdatedAt",
+                table: "InventoryItems",
+                type: "datetime2",
+                nullable: true);
+
+            migrationBuilder.AddColumn<decimal>(
+                name: "CatalogReferencePrice",
+                table: "InventoryItems",
+                type: "decimal(18,2)",
+                nullable: true);
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 1,
+                column: "CreatedAt",
+                value: new DateTime(2026, 6, 17, 19, 26, 43, 161, DateTimeKind.Utc).AddTicks(2051));
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 2,
+                column: "CreatedAt",
+                value: new DateTime(2026, 6, 17, 19, 26, 43, 161, DateTimeKind.Utc).AddTicks(2056));
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 3,
+                column: "CreatedAt",
+                value: new DateTime(2026, 6, 17, 19, 26, 43, 161, DateTimeKind.Utc).AddTicks(2057));
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "CatalogPriceUpdatedAt",
+                table: "InventoryItems");
+
+            migrationBuilder.DropColumn(
+                name: "CatalogReferencePrice",
+                table: "InventoryItems");
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 1,
+                column: "CreatedAt",
+                value: new DateTime(2026, 6, 17, 16, 33, 6, 662, DateTimeKind.Utc).AddTicks(4251));
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 2,
+                column: "CreatedAt",
+                value: new DateTime(2026, 6, 17, 16, 33, 6, 662, DateTimeKind.Utc).AddTicks(4258));
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 3,
+                column: "CreatedAt",
+                value: new DateTime(2026, 6, 17, 16, 33, 6, 662, DateTimeKind.Utc).AddTicks(4259));
+        }
+    }
+}

src/PowderCoating.Infrastructure/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -4075,6 +4075,12 @@ namespace PowderCoating.Infrastructure.Migrations
                     b.Property<decimal>("AverageCost")
                         .HasColumnType("decimal(18,2)");
 
+                    b.Property<DateTime?>("CatalogPriceUpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<decimal?>("CatalogReferencePrice")
+                        .HasColumnType("decimal(18,2)");
+
                     b.Property<string>("Category")
                         .IsRequired()
                         .HasColumnType("nvarchar(max)");
@@ -7235,7 +7241,7 @@ namespace PowderCoating.Infrastructure.Migrations
                         {
                             Id = 1,
                             CompanyId = 0,
-                            CreatedAt = new DateTime(2026, 6, 17, 16, 33, 6, 662, DateTimeKind.Utc).AddTicks(4251),
+                            CreatedAt = new DateTime(2026, 6, 17, 19, 26, 43, 161, DateTimeKind.Utc).AddTicks(2051),
                             Description = "Standard pricing for regular customers",
                             DiscountPercent = 0m,
                             IsActive = true,
@@ -7246,7 +7252,7 @@ namespace PowderCoating.Infrastructure.Migrations
                         {
                             Id = 2,
                             CompanyId = 0,
-                            CreatedAt = new DateTime(2026, 6, 17, 16, 33, 6, 662, DateTimeKind.Utc).AddTicks(4258),
+                            CreatedAt = new DateTime(2026, 6, 17, 19, 26, 43, 161, DateTimeKind.Utc).AddTicks(2056),
                             Description = "5% discount for preferred customers",
                             DiscountPercent = 5m,
                             IsActive = true,
@@ -7257,7 +7263,7 @@ namespace PowderCoating.Infrastructure.Migrations
                         {
                             Id = 3,
                             CompanyId = 0,
-                            CreatedAt = new DateTime(2026, 6, 17, 16, 33, 6, 662, DateTimeKind.Utc).AddTicks(4259),
+                            CreatedAt = new DateTime(2026, 6, 17, 19, 26, 43, 161, DateTimeKind.Utc).AddTicks(2057),
                             Description = "10% discount for premium customers",
                             DiscountPercent = 10m,
                             IsActive = true,

src/PowderCoating.Infrastructure/Services/PowderCatalogUpsertService.cs

@@ -76,13 +76,110 @@ public class PowderCatalogUpsertService : IPowderCatalogUpsertService
 
         await _unitOfWork.CompleteAsync();
 
+        // Push current catalog price + product data down to any tenant inventory linked to these
+        // catalog rows, so quotes reflect the current price.
+        var propagated = await PropagateToLinkedInventoryAsync();
+
         _logger.LogInformation(
-            "Powder catalog upsert: {Inserted} inserted, {Updated} updated, {Unchanged} unchanged, {Skipped} skipped.",
+            "Powder catalog upsert: {Inserted} inserted, {Updated} updated, {Unchanged} unchanged, {Skipped} skipped; {Propagated} linked inventory item(s) refreshed.",
-            result.Inserted, result.Updated, result.Unchanged, result.Skipped);
+            result.Inserted, result.Updated, result.Unchanged, result.Skipped, propagated);
 
         return result;
     }
 
+    /// <summary>
+    /// Refreshes every tenant inventory item linked to a powder catalog row (across all companies)
+    /// with the catalog's current list price and product data. Sets
+    /// <see cref="InventoryItem.CatalogReferencePrice"/> (the QUOTING price) and product spec/doc
+    /// fields, but NEVER the cost basis (UnitCost/AverageCost/LastPurchasePrice), quantity, notes,
+    /// image, location, or stock levels — those are tenant-owned. EF persists only items that
+    /// actually changed, so this is a cheap no-op when nothing moved. Returns the number updated.
+    /// </summary>
+    public async Task<int> PropagateToLinkedInventoryAsync()
+    {
+        var linked = (await _unitOfWork.InventoryItems.FindAsync(
+            i => i.PowderCatalogItemId != null, ignoreQueryFilters: true)).ToList();
+        if (linked.Count == 0)
+            return 0;
+
+        var catalogIds = linked.Select(i => i.PowderCatalogItemId!.Value).Distinct().ToList();
+        var catalogById = (await _unitOfWork.PowderCatalog.FindAsync(p => catalogIds.Contains(p.Id)))
+            .ToDictionary(p => p.Id);
+
+        var updated = 0;
+        foreach (var inv in linked)
+        {
+            if (!catalogById.TryGetValue(inv.PowderCatalogItemId!.Value, out var cat))
+                continue;
+
+            if (ApplyCatalogToLinkedInventory(inv, cat))
+            {
+                await _unitOfWork.InventoryItems.UpdateAsync(inv);
+                updated++;
+            }
+        }
+
+        if (updated > 0)
+            await _unitOfWork.CompleteAsync();
+
+        return updated;
+    }
+
+    /// <summary>
+    /// Applies the catalog's current price and product data onto a linked inventory item, returning
+    /// true if anything changed. Sets the quoting reference price (only when the catalog has a real
+    /// price &gt; 0) and refreshes product/spec fields where the catalog has a value — never erasing
+    /// tenant data with catalog nulls, and never touching cost basis, quantity, notes, image, or
+    /// stock levels.
+    /// </summary>
+    private static bool ApplyCatalogToLinkedInventory(InventoryItem inv, PowderCatalogItem cat)
+    {
+        var changed = false;
+
+        // Quoting price (the point of this): keep the current catalog list price, separate from cost.
+        if (cat.UnitPrice > 0 && inv.CatalogReferencePrice != cat.UnitPrice)
+        {
+            inv.CatalogReferencePrice = cat.UnitPrice;
+            inv.CatalogPriceUpdatedAt = DateTime.UtcNow;
+            changed = true;
+        }
+
+        // Product data — refresh from the catalog where it has a value (catalog is authoritative on
+        // these); do not null out a tenant value the catalog doesn't carry.
+        changed |= SetStrIfCatalogHas(() => inv.Description, v => inv.Description = v, cat.Description);
+        changed |= SetStrIfCatalogHas(() => inv.Finish, v => inv.Finish = v, cat.Finish);
+        changed |= SetStrIfCatalogHas(() => inv.ColorFamilies, v => inv.ColorFamilies = v, cat.ColorFamilies);
+        changed |= SetStrIfCatalogHas(() => inv.SdsUrl, v => inv.SdsUrl = v, cat.SdsUrl);
+        changed |= SetStrIfCatalogHas(() => inv.TdsUrl, v => inv.TdsUrl = v, cat.TdsUrl);
+        changed |= SetStrIfCatalogHas(() => inv.SpecPageUrl, v => inv.SpecPageUrl = v, cat.ProductUrl);
+
+        if (cat.CureTemperatureF.HasValue && inv.CureTemperatureF != cat.CureTemperatureF)
+        { inv.CureTemperatureF = cat.CureTemperatureF; changed = true; }
+        if (cat.CureTimeMinutes.HasValue && inv.CureTimeMinutes != cat.CureTimeMinutes)
+        { inv.CureTimeMinutes = cat.CureTimeMinutes; changed = true; }
+        if (cat.CoverageSqFtPerLb.HasValue && inv.CoverageSqFtPerLb != cat.CoverageSqFtPerLb)
+        { inv.CoverageSqFtPerLb = cat.CoverageSqFtPerLb; changed = true; }
+        if (cat.SpecificGravity.HasValue && inv.SpecificGravity != cat.SpecificGravity)
+        { inv.SpecificGravity = cat.SpecificGravity; changed = true; }
+        if (cat.TransferEfficiency.HasValue && inv.TransferEfficiency != cat.TransferEfficiency)
+        { inv.TransferEfficiency = cat.TransferEfficiency; changed = true; }
+        if (cat.RequiresClearCoat == true && !inv.RequiresClearCoat)
+        { inv.RequiresClearCoat = true; changed = true; }
+
+        return changed;
+    }
+
+    /// <summary>Sets a string property from the catalog only when the catalog value is non-blank and differs.</summary>
+    private static bool SetStrIfCatalogHas(Func<string?> get, Action<string?> set, string? catalogValue)
+    {
+        if (!string.IsNullOrWhiteSpace(catalogValue) && !string.Equals(get(), catalogValue, StringComparison.Ordinal))
+        {
+            set(catalogValue);
+            return true;
+        }
+        return false;
+    }
+
     private static string KeyOf(PowderCatalogItem p) => $"{p.VendorName}|{p.Sku}";
 
     /// <summary>

src/PowderCoating.Web/Controllers/DashboardController.cs

@@ -850,6 +850,13 @@ public class DashboardController : Controller
             item.UnitCost = catalog.UnitPrice;
             item.LastPurchasePrice = catalog.UnitPrice;
         }
+
+        // Quoting reference price (current catalog list price) — separate from cost basis above.
+        if (catalog.UnitPrice > 0)
+        {
+            item.CatalogReferencePrice = catalog.UnitPrice;
+            item.CatalogPriceUpdatedAt = DateTime.UtcNow;
+        }
     }
 
     /// <summary>

src/PowderCoating.Web/Controllers/InventoryController.cs

@@ -314,10 +314,18 @@ public class InventoryController : Controller
             }
 
             // Link to the platform catalog row when this item's identity matches one, so the detail
-            // screen can show manufacturer-level status (discontinued / cannot reorder).
+            // screen can show manufacturer-level status (discontinued / cannot reorder) and quotes
+            // can use the current catalog price.
             var catalogMatch = await FindCatalogMatchAsync(item.Manufacturer, item.ManufacturerPartNumber);
             if (catalogMatch != null)
+            {
                 item.PowderCatalogItemId = catalogMatch.Id;
+                if (catalogMatch.UnitPrice > 0)
+                {
+                    item.CatalogReferencePrice = catalogMatch.UnitPrice;
+                    item.CatalogPriceUpdatedAt = DateTime.UtcNow;
+                }
+            }
 
             await _unitOfWork.InventoryItems.AddAsync(item);
             await _unitOfWork.SaveChangesAsync();
@@ -1308,6 +1316,8 @@ public class InventoryController : Controller
                 UnitCost              = catalogItem.UnitPrice,
                 AverageCost           = catalogItem.UnitPrice,
                 LastPurchasePrice     = catalogItem.UnitPrice,
+                CatalogReferencePrice = catalogItem.UnitPrice > 0 ? catalogItem.UnitPrice : (decimal?)null,
+                CatalogPriceUpdatedAt = catalogItem.UnitPrice > 0 ? DateTime.UtcNow : (DateTime?)null,
                 QuantityOnHand        = 0,
                 UnitOfMeasure         = "lbs",
                 InventoryCategoryId   = coatingCategory.Id,
@@ -1333,7 +1343,7 @@ public class InventoryController : Controller
                 efficiency   = item.TransferEfficiency ?? 65m,
                 unitOfMeasure= item.UnitOfMeasure,
                 categoryName = coatingCategory.DisplayName,
-                costPerLb    = item.UnitCost,
+                costPerLb    = item.CatalogReferencePrice ?? item.UnitCost,
                 colorName    = item.ColorName ?? item.Name,
                 colorCode    = "",
                 isIncoming   = true

src/PowderCoating.Web/Controllers/JobsController.cs

@@ -3492,7 +3492,8 @@ public class JobsController : Controller
                 efficiency = i.TransferEfficiency ?? 65m,
                 unitOfMeasure = i.UnitOfMeasure ?? "lbs",
                 categoryName = i.InventoryCategory!.DisplayName,
-                costPerLb = i.UnitCost,
+                // Quote at the current catalog price when linked; fall back to their cost otherwise.
+                costPerLb = i.CatalogReferencePrice ?? i.UnitCost,
                 colorName = i.ColorName ?? i.Name,
                 colorCode = i.ColorCode ?? "",
                 isIncoming = i.IsIncoming

src/PowderCoating.Web/Controllers/QuotesController.cs

@@ -2545,7 +2545,8 @@ public class QuotesController : Controller
                 efficiency = i.TransferEfficiency ?? 65m,
                 unitOfMeasure = i.UnitOfMeasure ?? "lbs",
                 categoryName = i.InventoryCategory!.DisplayName,
-                costPerLb = i.UnitCost,
+                // Quote at the current catalog price when linked; fall back to their cost otherwise.
+                costPerLb = i.CatalogReferencePrice ?? i.UnitCost,
                 colorName = i.ColorName ?? i.Name,
                 colorCode = i.ColorCode ?? "",
                 isIncoming = i.IsIncoming

tests/PowderCoating.UnitTests/PowderCatalogPropagationTests.cs

@@ -0,0 +1,145 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using Moq;
+using PowderCoating.Core.Entities;
+using PowderCoating.Infrastructure.Data;
+using PowderCoating.Infrastructure.Repositories;
+using PowderCoating.Infrastructure.Services;
+
+namespace PowderCoating.UnitTests;
+
+/// <summary>
+/// Verifies that catalog sync propagation updates a linked inventory item's quoting reference price
+/// and product data, while never touching the tenant-owned cost basis, quantity, notes, or image.
+/// </summary>
+public class PowderCatalogPropagationTests
+{
+    [Fact]
+    public async Task Propagate_UpdatesReferencePriceAndSpecs_ButNotCostQuantityNotesOrImage()
+    {
+        await using var context = CreateContext();
+
+        var catalog = new PowderCatalogItem
+        {
+            VendorName = "Columbia Coatings",
+            Sku = "CS1693053",
+            ColorName = "Joker Jewel",
+            Source = "Columbia Coatings API",
+            UnitPrice = 28m,                // new catalog price
+            SdsUrl = "https://cc/sds.pdf",
+            TdsUrl = "https://cc/tds.pdf",
+            CureTemperatureF = 400m,
+            CureTimeMinutes = 10,
+            ColorFamilies = "Green,Purple",
+        };
+        context.PowderCatalogItems.Add(catalog);
+        await context.SaveChangesAsync();
+
+        var inv = new InventoryItem
+        {
+            CompanyId = 1,
+            SKU = "POWD-2606-0001",
+            Name = "Joker Jewel",
+            PowderCatalogItemId = catalog.Id,
+            UnitCost = 20m,                 // what they actually paid
+            AverageCost = 20m,
+            LastPurchasePrice = 20m,
+            QuantityOnHand = 5m,
+            Notes = "keep my note",
+            ImageUrl = "my-own-photo.jpg",
+            CatalogReferencePrice = null,   // not yet set
+        };
+        context.InventoryItems.Add(inv);
+        await context.SaveChangesAsync();
+
+        var service = new PowderCatalogUpsertService(
+            new UnitOfWork(context),
+            Mock.Of<ILogger<PowderCatalogUpsertService>>());
+
+        var updated = await service.PropagateToLinkedInventoryAsync();
+
+        Assert.Equal(1, updated);
+
+        var refreshed = await context.InventoryItems.FindAsync(inv.Id);
+        Assert.NotNull(refreshed);
+
+        // Quoting reference price + product data refreshed from the catalog.
+        Assert.Equal(28m, refreshed!.CatalogReferencePrice);
+        Assert.NotNull(refreshed.CatalogPriceUpdatedAt);
+        Assert.Equal("https://cc/sds.pdf", refreshed.SdsUrl);
+        Assert.Equal("https://cc/tds.pdf", refreshed.TdsUrl);
+        Assert.Equal(400m, refreshed.CureTemperatureF);
+        Assert.Equal("Green,Purple", refreshed.ColorFamilies);
+
+        // Tenant-owned fields untouched.
+        Assert.Equal(20m, refreshed.UnitCost);
+        Assert.Equal(20m, refreshed.AverageCost);
+        Assert.Equal(20m, refreshed.LastPurchasePrice);
+        Assert.Equal(5m, refreshed.QuantityOnHand);
+        Assert.Equal("keep my note", refreshed.Notes);
+        Assert.Equal("my-own-photo.jpg", refreshed.ImageUrl);
+    }
+
+    [Fact]
+    public async Task Propagate_DoesNotSetReferencePrice_WhenCatalogPriceIsZero()
+    {
+        await using var context = CreateContext();
+
+        var catalog = new PowderCatalogItem
+        {
+            VendorName = "Columbia Coatings",
+            Sku = "X1",
+            ColorName = "No Price",
+            Source = "Columbia Coatings API",
+            UnitPrice = 0m, // unknown price — must not wipe quoting with $0
+        };
+        context.PowderCatalogItems.Add(catalog);
+        await context.SaveChangesAsync();
+
+        var inv = new InventoryItem
+        {
+            CompanyId = 1,
+            SKU = "POWD-2606-0002",
+            Name = "No Price",
+            PowderCatalogItemId = catalog.Id,
+            UnitCost = 15m,
+            CatalogReferencePrice = null,
+        };
+        context.InventoryItems.Add(inv);
+        await context.SaveChangesAsync();
+
+        var service = new PowderCatalogUpsertService(
+            new UnitOfWork(context),
+            Mock.Of<ILogger<PowderCatalogUpsertService>>());
+
+        await service.PropagateToLinkedInventoryAsync();
+
+        var refreshed = await context.InventoryItems.FindAsync(inv.Id);
+        Assert.Null(refreshed!.CatalogReferencePrice); // stays null -> quoting falls back to UnitCost
+    }
+
+    private static ApplicationDbContext CreateContext()
+    {
+        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
+            .UseInMemoryDatabase(Guid.NewGuid().ToString())
+            .Options;
+
+        var identity = new ClaimsIdentity([new Claim(ClaimTypes.Role, "SuperAdmin")], "Test");
+        var principal = new ClaimsPrincipal(identity);
+
+        byte[]? noBytes = null;
+        var sessionMock = new Mock<ISession>();
+        sessionMock.Setup(s => s.TryGetValue(It.IsAny<string>(), out noBytes)).Returns(false);
+
+        var httpContextMock = new Mock<HttpContext>();
+        httpContextMock.SetupGet(c => c.User).Returns(principal);
+        httpContextMock.SetupGet(c => c.Session).Returns(sessionMock.Object);
+
+        var accessor = new Mock<IHttpContextAccessor>();
+        accessor.SetupGet(a => a.HttpContext).Returns(httpContextMock.Object);
+
+        return new ApplicationDbContext(options, accessor.Object, null!);
+    }
+}