From 5f5ba9e4a252c5f9f7b7554a0f955c8e966d840f Mon Sep 17 00:00:00 2001
From: Ryan Moon <moonryan2009@gmail.com>
Date: Mon, 30 Mar 2026 20:12:07 -0500
Subject: [PATCH] Build inventory frontend and stock management features
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Full inventory UI: product list with search/filter, product detail with
  tabs (details, units, suppliers, stock receipts, price history)
- Product filters: category, type (serialized/rental/repair), low stock,
  active/inactive — all server-side with URL-synced state
- Product-supplier junction: link products to multiple suppliers with
  preferred flag, joined supplier details in UI
- Stock receipts: record incoming stock with supplier, qty, cost per unit,
  invoice number; auto-increments qty_on_hand for non-serialized products
- Price history tab on product detail page
- categories/all endpoint to avoid pagination limit on dropdown fetches
- categoryId filter on product list endpoint
- Repair parts and additional inventory items in music store seed data
- isDualUseRepair corrected: instruments set to false, strings/parts true
- Product-supplier links and stock receipts in seed data
- Price history seed data simulating cost increases over past year
- 37 API tests covering categories, suppliers, products, units,
  product-suppliers, and stock receipts
- alert-dialog and checkbox UI components
- sync-and-deploy.sh script for rsync + remote deploy
---
 deploy/deploy.sh                              |    4 +-
 deploy/sync-and-deploy.sh                     |   25 +
 packages/admin/src/api/inventory.ts           |  162 +++
 .../components/inventory/category-form.tsx    |   91 ++
 .../inventory/inventory-unit-form.tsx         |  118 ++
 .../src/components/inventory/product-form.tsx |  172 +++
 .../components/inventory/supplier-form.tsx    |   88 ++
 .../admin/src/components/ui/alert-dialog.tsx  |  142 +++
 packages/admin/src/components/ui/checkbox.tsx |   30 +
 packages/admin/src/routeTree.gen.ts           |   89 ++
 packages/admin/src/routes/_authenticated.tsx  |   10 +-
 .../_authenticated/inventory/$productId.tsx   |  786 ++++++++++++
 .../_authenticated/inventory/categories.tsx   |  170 +++
 .../routes/_authenticated/inventory/index.tsx |  253 ++++
 .../inventory/suppliers/index.tsx             |  185 +++
 packages/admin/src/types/inventory.ts         |  108 ++
 .../backend/api-tests/suites/inventory.ts     |  364 ++++++
 .../backend/src/db/seeds/music-store-seed.ts  | 1126 ++++++++++++++---
 packages/backend/src/routes/v1/inventory.ts   |    5 +
 packages/backend/src/routes/v1/products.ts    |   78 +-
 .../backend/src/services/inventory.service.ts |    8 +
 .../backend/src/services/product.service.ts   |  169 ++-
 packages/shared/src/schemas/index.ts          |    6 +
 .../shared/src/schemas/inventory.schema.ts    |   21 +
 24 files changed, 4023 insertions(+), 187 deletions(-)
 create mode 100755 deploy/sync-and-deploy.sh
 create mode 100644 packages/admin/src/api/inventory.ts
 create mode 100644 packages/admin/src/components/inventory/category-form.tsx
 create mode 100644 packages/admin/src/components/inventory/inventory-unit-form.tsx
 create mode 100644 packages/admin/src/components/inventory/product-form.tsx
 create mode 100644 packages/admin/src/components/inventory/supplier-form.tsx
 create mode 100644 packages/admin/src/components/ui/alert-dialog.tsx
 create mode 100644 packages/admin/src/components/ui/checkbox.tsx
 create mode 100644 packages/admin/src/routes/_authenticated/inventory/$productId.tsx
 create mode 100644 packages/admin/src/routes/_authenticated/inventory/categories.tsx
 create mode 100644 packages/admin/src/routes/_authenticated/inventory/index.tsx
 create mode 100644 packages/admin/src/routes/_authenticated/inventory/suppliers/index.tsx
 create mode 100644 packages/admin/src/types/inventory.ts
 create mode 100644 packages/backend/api-tests/suites/inventory.ts

diff --git a/deploy/deploy.sh b/deploy/deploy.sh
index c6e01d7..134d6ba 100755
--- a/deploy/deploy.sh
+++ b/deploy/deploy.sh
@@ -20,8 +20,8 @@ sudo -u "$APP_USER" bash -c \
   "cd ${APP_DIR}/packages/backend && ${BUN_BIN} x drizzle-kit migrate"
 
 echo "==> Restarting backend..."
-systemctl restart lunarfront
+sudo systemctl restart lunarfront
 
 echo "==> Done! Checking status..."
 sleep 2
-systemctl status lunarfront --no-pager
+sudo systemctl status lunarfront --no-pager
diff --git a/deploy/sync-and-deploy.sh b/deploy/sync-and-deploy.sh
new file mode 100755
index 0000000..f98467d
--- /dev/null
+++ b/deploy/sync-and-deploy.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# LunarFront — Sync local source to EC2 and redeploy
+# Usage: bash deploy/sync-and-deploy.sh
+set -euo pipefail
+
+EC2_HOST="18.217.233.214"
+EC2_USER="ubuntu"
+SSH_KEY="$HOME/.ssh/lunarfront-dev.pem"
+APP_DIR="/opt/lunarfront"
+
+echo "==> Syncing source to ${EC2_USER}@${EC2_HOST}:${APP_DIR} ..."
+rsync -az --delete \
+  --exclude='.git' \
+  --exclude='node_modules' \
+  --exclude='packages/*/node_modules' \
+  --exclude='packages/admin/dist' \
+  --exclude='packages/backend/dist' \
+  --exclude='*.env' \
+  -e "ssh -i ${SSH_KEY} -o StrictHostKeyChecking=no" \
+  /home/ryan/pos/ \
+  "${EC2_USER}@${EC2_HOST}:${APP_DIR}/"
+
+echo "==> Running deploy script on server..."
+ssh -i "${SSH_KEY}" -o StrictHostKeyChecking=no "${EC2_USER}@${EC2_HOST}" \
+  "sudo bash ${APP_DIR}/deploy/deploy.sh"
diff --git a/packages/admin/src/api/inventory.ts b/packages/admin/src/api/inventory.ts
new file mode 100644
index 0000000..d6e6b16
--- /dev/null
+++ b/packages/admin/src/api/inventory.ts
@@ -0,0 +1,162 @@
+import { queryOptions } from '@tanstack/react-query'
+import { api } from '@/lib/api-client'
+import type { Category, Supplier, Product, InventoryUnit, ProductSupplier, StockReceipt, PriceHistory } from '@/types/inventory'
+import type { PaginatedResponse, PaginationInput } from '@lunarfront/shared/schemas'
+
+// ─── Categories ──────────────────────────────────────────────────────────────
+
+export const categoryKeys = {
+  all: ['categories'] as const,
+  list: (params: PaginationInput) => [...categoryKeys.all, 'list', params] as const,
+  allCategories: [...['categories'], 'all-flat'] as const,
+  detail: (id: string) => [...categoryKeys.all, 'detail', id] as const,
+}
+
+export function categoryListOptions(params: PaginationInput) {
+  return queryOptions({
+    queryKey: categoryKeys.list(params),
+    queryFn: () => api.get<PaginatedResponse<Category>>('/v1/categories', params as Record<string, unknown>),
+  })
+}
+
+export function categoryAllOptions() {
+  return queryOptions({
+    queryKey: categoryKeys.allCategories,
+    queryFn: () => api.get<{ data: Category[] }>('/v1/categories/all'),
+  })
+}
+
+export const categoryMutations = {
+  create: (data: Record<string, unknown>) => api.post<Category>('/v1/categories', data),
+  update: (id: string, data: Record<string, unknown>) => api.patch<Category>(`/v1/categories/${id}`, data),
+  delete: (id: string) => api.del<Category>(`/v1/categories/${id}`),
+}
+
+// ─── Suppliers ───────────────────────────────────────────────────────────────
+
+export const supplierKeys = {
+  all: ['suppliers'] as const,
+  list: (params: PaginationInput) => [...supplierKeys.all, 'list', params] as const,
+  detail: (id: string) => [...supplierKeys.all, 'detail', id] as const,
+}
+
+export function supplierListOptions(params: PaginationInput) {
+  return queryOptions({
+    queryKey: supplierKeys.list(params),
+    queryFn: () => api.get<PaginatedResponse<Supplier>>('/v1/suppliers', params as Record<string, unknown>),
+  })
+}
+
+export const supplierMutations = {
+  create: (data: Record<string, unknown>) => api.post<Supplier>('/v1/suppliers', data),
+  update: (id: string, data: Record<string, unknown>) => api.patch<Supplier>(`/v1/suppliers/${id}`, data),
+  delete: (id: string) => api.del<Supplier>(`/v1/suppliers/${id}`),
+}
+
+// ─── Products ────────────────────────────────────────────────────────────────
+
+export const productKeys = {
+  all: ['products'] as const,
+  list: (params: Record<string, unknown>) => [...productKeys.all, 'list', params] as const,
+  detail: (id: string) => [...productKeys.all, 'detail', id] as const,
+}
+
+export function productListOptions(params: Record<string, unknown>) {
+  return queryOptions({
+    queryKey: productKeys.list(params),
+    queryFn: () => api.get<PaginatedResponse<Product>>('/v1/products', params),
+  })
+}
+
+export function productDetailOptions(id: string) {
+  return queryOptions({
+    queryKey: productKeys.detail(id),
+    queryFn: () => api.get<Product>(`/v1/products/${id}`),
+    enabled: !!id,
+  })
+}
+
+export const productMutations = {
+  create: (data: Record<string, unknown>) => api.post<Product>('/v1/products', data),
+  update: (id: string, data: Record<string, unknown>) => api.patch<Product>(`/v1/products/${id}`, data),
+  delete: (id: string) => api.del<Product>(`/v1/products/${id}`),
+}
+
+// ─── Inventory Units ─────────────────────────────────────────────────────────
+
+export const unitKeys = {
+  all: ['inventory-units'] as const,
+  byProduct: (productId: string) => [...unitKeys.all, 'product', productId] as const,
+  detail: (id: string) => [...unitKeys.all, 'detail', id] as const,
+}
+
+export function unitListOptions(productId: string) {
+  return queryOptions({
+    queryKey: unitKeys.byProduct(productId),
+    queryFn: () => api.get<{ data: InventoryUnit[] }>(`/v1/products/${productId}/units`),
+    enabled: !!productId,
+  })
+}
+
+export const unitMutations = {
+  create: (productId: string, data: Record<string, unknown>) =>
+    api.post<InventoryUnit>(`/v1/products/${productId}/units`, data),
+  update: (id: string, data: Record<string, unknown>) =>
+    api.patch<InventoryUnit>(`/v1/units/${id}`, data),
+}
+
+// ─── Product Suppliers ───────────────────────────────────────────────────────
+
+export const productSupplierKeys = {
+  byProduct: (productId: string) => ['products', productId, 'suppliers'] as const,
+}
+
+export function productSupplierListOptions(productId: string) {
+  return queryOptions({
+    queryKey: productSupplierKeys.byProduct(productId),
+    queryFn: () => api.get<{ data: ProductSupplier[] }>(`/v1/products/${productId}/suppliers`),
+    enabled: !!productId,
+  })
+}
+
+export const productSupplierMutations = {
+  create: (productId: string, data: Record<string, unknown>) =>
+    api.post<ProductSupplier>(`/v1/products/${productId}/suppliers`, data),
+  update: (productId: string, id: string, data: Record<string, unknown>) =>
+    api.patch<ProductSupplier>(`/v1/products/${productId}/suppliers/${id}`, data),
+  delete: (productId: string, id: string) =>
+    api.del(`/v1/products/${productId}/suppliers/${id}`),
+}
+
+// ─── Stock Receipts ──────────────────────────────────────────────────────────
+
+export const stockReceiptKeys = {
+  byProduct: (productId: string) => ['products', productId, 'stock-receipts'] as const,
+}
+
+export function stockReceiptListOptions(productId: string) {
+  return queryOptions({
+    queryKey: stockReceiptKeys.byProduct(productId),
+    queryFn: () => api.get<{ data: StockReceipt[] }>(`/v1/products/${productId}/stock-receipts`),
+    enabled: !!productId,
+  })
+}
+
+export const stockReceiptMutations = {
+  create: (productId: string, data: Record<string, unknown>) =>
+    api.post<StockReceipt>(`/v1/products/${productId}/stock-receipts`, data),
+}
+
+// ─── Price History ───────────────────────────────────────────────────────────
+
+export const priceHistoryKeys = {
+  byProduct: (productId: string) => ['products', productId, 'price-history'] as const,
+}
+
+export function priceHistoryOptions(productId: string) {
+  return queryOptions({
+    queryKey: priceHistoryKeys.byProduct(productId),
+    queryFn: () => api.get<{ data: PriceHistory[] }>(`/v1/products/${productId}/price-history`),
+    enabled: !!productId,
+  })
+}
diff --git a/packages/admin/src/components/inventory/category-form.tsx b/packages/admin/src/components/inventory/category-form.tsx
new file mode 100644
index 0000000..b8cbfd2
--- /dev/null
+++ b/packages/admin/src/components/inventory/category-form.tsx
@@ -0,0 +1,91 @@
+import { useForm } from 'react-hook-form'
+import { useQuery } from '@tanstack/react-query'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
+import { categoryAllOptions } from '@/api/inventory'
+import type { Category } from '@/types/inventory'
+
+interface Props {
+  defaultValues?: Partial<Category>
+  onSubmit: (data: Record<string, unknown>) => void
+  onDelete?: () => void
+  loading?: boolean
+  deleteLoading?: boolean
+}
+
+export function CategoryForm({ defaultValues, onSubmit, onDelete, loading, deleteLoading }: Props) {
+  const { data: allCats } = useQuery(categoryAllOptions())
+  const categories = (allCats?.data ?? []).filter((c) => c.id !== defaultValues?.id && c.isActive)
+
+  const { register, handleSubmit, setValue, watch } = useForm({
+    defaultValues: {
+      name: defaultValues?.name ?? '',
+      parentId: defaultValues?.parentId ?? '',
+      sortOrder: defaultValues?.sortOrder ?? 0,
+      isActive: defaultValues?.isActive ?? true,
+    },
+  })
+
+  const parentId = watch('parentId')
+  const isActive = watch('isActive')
+
+  function handleFormSubmit(data: { name: string; parentId: string; sortOrder: number; isActive: boolean }) {
+    onSubmit({
+      name: data.name,
+      parentId: data.parentId || undefined,
+      sortOrder: Number(data.sortOrder),
+      isActive: data.isActive,
+    })
+  }
+
+  return (
+    <form onSubmit={handleSubmit(handleFormSubmit)} className="space-y-4">
+      <div className="space-y-2">
+        <Label htmlFor="cat-name">Name *</Label>
+        <Input id="cat-name" {...register('name')} placeholder="e.g. Guitars, Accessories" required />
+      </div>
+      <div className="space-y-2">
+        <Label>Parent Category</Label>
+        <Select value={parentId || 'none'} onValueChange={(v) => setValue('parentId', v === 'none' ? '' : v)}>
+          <SelectTrigger>
+            <SelectValue placeholder="None (Top Level)" />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="none">None (Top Level)</SelectItem>
+            {categories.map((c) => (
+              <SelectItem key={c.id} value={c.id}>{c.name}</SelectItem>
+            ))}
+          </SelectContent>
+        </Select>
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="cat-order">Sort Order</Label>
+          <Input id="cat-order" type="number" min={0} {...register('sortOrder')} />
+        </div>
+        <div className="flex items-center gap-2 pt-7">
+          <input
+            id="cat-active"
+            type="checkbox"
+            checked={isActive}
+            onChange={(e) => setValue('isActive', e.target.checked)}
+            className="h-4 w-4"
+          />
+          <Label htmlFor="cat-active">Active</Label>
+        </div>
+      </div>
+      <div className="flex gap-2 pt-2">
+        <Button type="submit" disabled={loading} className="flex-1">
+          {loading ? 'Saving...' : defaultValues?.id ? 'Save Changes' : 'Create Category'}
+        </Button>
+        {onDelete && (
+          <Button type="button" variant="destructive" disabled={deleteLoading} onClick={onDelete}>
+            {deleteLoading ? 'Deleting...' : 'Delete'}
+          </Button>
+        )}
+      </div>
+    </form>
+  )
+}
diff --git a/packages/admin/src/components/inventory/inventory-unit-form.tsx b/packages/admin/src/components/inventory/inventory-unit-form.tsx
new file mode 100644
index 0000000..82a6b5e
--- /dev/null
+++ b/packages/admin/src/components/inventory/inventory-unit-form.tsx
@@ -0,0 +1,118 @@
+import { useForm } from 'react-hook-form'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
+import type { InventoryUnit, UnitCondition, UnitStatus } from '@/types/inventory'
+
+const CONDITIONS: { value: UnitCondition; label: string }[] = [
+  { value: 'new', label: 'New' },
+  { value: 'excellent', label: 'Excellent' },
+  { value: 'good', label: 'Good' },
+  { value: 'fair', label: 'Fair' },
+  { value: 'poor', label: 'Poor' },
+]
+
+const STATUSES: { value: UnitStatus; label: string }[] = [
+  { value: 'available', label: 'Available' },
+  { value: 'sold', label: 'Sold' },
+  { value: 'rented', label: 'Rented' },
+  { value: 'on_trial', label: 'On Trial' },
+  { value: 'in_repair', label: 'In Repair' },
+  { value: 'layaway', label: 'Layaway' },
+  { value: 'lost', label: 'Lost' },
+  { value: 'retired', label: 'Retired' },
+]
+
+interface Props {
+  defaultValues?: Partial<InventoryUnit>
+  onSubmit: (data: Record<string, unknown>) => void
+  loading?: boolean
+}
+
+export function InventoryUnitForm({ defaultValues, onSubmit, loading }: Props) {
+  const { register, handleSubmit, setValue, watch } = useForm({
+    defaultValues: {
+      serialNumber: defaultValues?.serialNumber ?? '',
+      condition: (defaultValues?.condition ?? 'new') as UnitCondition,
+      status: (defaultValues?.status ?? 'available') as UnitStatus,
+      purchaseDate: defaultValues?.purchaseDate ?? '',
+      purchaseCost: defaultValues?.purchaseCost ?? '',
+      notes: defaultValues?.notes ?? '',
+    },
+  })
+
+  const condition = watch('condition')
+  const status = watch('status')
+
+  function handleFormSubmit(data: Record<string, unknown>) {
+    onSubmit({
+      serialNumber: (data.serialNumber as string) || undefined,
+      condition: data.condition,
+      status: data.status,
+      purchaseDate: (data.purchaseDate as string) || undefined,
+      purchaseCost: (data.purchaseCost as string) || undefined,
+      notes: (data.notes as string) || undefined,
+    })
+  }
+
+  return (
+    <form onSubmit={handleSubmit(handleFormSubmit)} className="space-y-4">
+      <div className="space-y-2">
+        <Label htmlFor="unit-serial">Serial Number</Label>
+        <Input id="unit-serial" {...register('serialNumber')} placeholder="e.g. US22041234" />
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label>Condition</Label>
+          <Select value={condition} onValueChange={(v) => setValue('condition', v as UnitCondition)}>
+            <SelectTrigger>
+              <SelectValue />
+            </SelectTrigger>
+            <SelectContent>
+              {CONDITIONS.map((c) => (
+                <SelectItem key={c.value} value={c.value}>{c.label}</SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+        </div>
+        <div className="space-y-2">
+          <Label>Status</Label>
+          <Select value={status} onValueChange={(v) => setValue('status', v as UnitStatus)}>
+            <SelectTrigger>
+              <SelectValue />
+            </SelectTrigger>
+            <SelectContent>
+              {STATUSES.map((s) => (
+                <SelectItem key={s.value} value={s.value}>{s.label}</SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+        </div>
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="unit-date">Purchase Date</Label>
+          <Input id="unit-date" type="date" {...register('purchaseDate')} />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="unit-cost">Purchase Cost</Label>
+          <Input id="unit-cost" type="number" step="0.01" min="0" {...register('purchaseCost')} placeholder="0.00" />
+        </div>
+      </div>
+      <div className="space-y-2">
+        <Label htmlFor="unit-notes">Notes</Label>
+        <textarea
+          id="unit-notes"
+          {...register('notes')}
+          rows={2}
+          placeholder="Any notes about this unit..."
+          className="w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring resize-none"
+        />
+      </div>
+      <Button type="submit" disabled={loading} className="w-full">
+        {loading ? 'Saving...' : defaultValues?.id ? 'Save Changes' : 'Add Unit'}
+      </Button>
+    </form>
+  )
+}
diff --git a/packages/admin/src/components/inventory/product-form.tsx b/packages/admin/src/components/inventory/product-form.tsx
new file mode 100644
index 0000000..bca21f7
--- /dev/null
+++ b/packages/admin/src/components/inventory/product-form.tsx
@@ -0,0 +1,172 @@
+import { useForm } from 'react-hook-form'
+import { useQuery } from '@tanstack/react-query'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
+import { categoryAllOptions } from '@/api/inventory'
+import type { Product } from '@/types/inventory'
+
+interface Props {
+  defaultValues?: Partial<Product>
+  onSubmit: (data: Record<string, unknown>) => void
+  loading?: boolean
+}
+
+export function ProductForm({ defaultValues, onSubmit, loading }: Props) {
+  const { data: allCats } = useQuery(categoryAllOptions())
+  const categories = (allCats?.data ?? []).filter((c) => c.isActive)
+
+  const { register, handleSubmit, setValue, watch } = useForm({
+    defaultValues: {
+      name: defaultValues?.name ?? '',
+      sku: defaultValues?.sku ?? '',
+      upc: defaultValues?.upc ?? '',
+      brand: defaultValues?.brand ?? '',
+      model: defaultValues?.model ?? '',
+      description: defaultValues?.description ?? '',
+      categoryId: defaultValues?.categoryId ?? '',
+      price: defaultValues?.price ?? '',
+      minPrice: defaultValues?.minPrice ?? '',
+      rentalRateMonthly: defaultValues?.rentalRateMonthly ?? '',
+      qtyOnHand: defaultValues?.qtyOnHand ?? 0,
+      qtyReorderPoint: defaultValues?.qtyReorderPoint ?? '',
+      isSerialized: defaultValues?.isSerialized ?? false,
+      isRental: defaultValues?.isRental ?? false,
+      isDualUseRepair: defaultValues?.isDualUseRepair ?? false,
+      isActive: defaultValues?.isActive ?? true,
+    },
+  })
+
+  const categoryId = watch('categoryId')
+  const isRental = watch('isRental')
+  const isSerialized = watch('isSerialized')
+  const isDualUseRepair = watch('isDualUseRepair')
+  const isActive = watch('isActive')
+
+  function handleFormSubmit(data: Record<string, unknown>) {
+    onSubmit({
+      name: data.name,
+      sku: (data.sku as string) || undefined,
+      upc: (data.upc as string) || undefined,
+      brand: (data.brand as string) || undefined,
+      model: (data.model as string) || undefined,
+      description: (data.description as string) || undefined,
+      categoryId: (data.categoryId as string) || undefined,
+      price: (data.price as string) ? Number(data.price) : undefined,
+      minPrice: (data.minPrice as string) ? Number(data.minPrice) : undefined,
+      rentalRateMonthly: isRental && (data.rentalRateMonthly as string) ? Number(data.rentalRateMonthly) : undefined,
+      qtyOnHand: Number(data.qtyOnHand),
+      qtyReorderPoint: (data.qtyReorderPoint as string) ? Number(data.qtyReorderPoint) : undefined,
+      isSerialized: data.isSerialized,
+      isRental: data.isRental,
+      isDualUseRepair: data.isDualUseRepair,
+      isActive: data.isActive,
+    })
+  }
+
+  return (
+    <form onSubmit={handleSubmit(handleFormSubmit)} className="space-y-4">
+      <div className="space-y-2">
+        <Label htmlFor="p-name">Name *</Label>
+        <Input id="p-name" {...register('name')} placeholder="e.g. Fender Player Stratocaster" required />
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="p-sku">SKU</Label>
+          <Input id="p-sku" {...register('sku')} placeholder="STR-001" />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="p-upc">UPC / Barcode</Label>
+          <Input id="p-upc" {...register('upc')} placeholder="0123456789" />
+        </div>
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="p-brand">Brand</Label>
+          <Input id="p-brand" {...register('brand')} placeholder="Fender" />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="p-model">Model</Label>
+          <Input id="p-model" {...register('model')} placeholder="Player Stratocaster" />
+        </div>
+      </div>
+      <div className="space-y-2">
+        <Label>Category</Label>
+        <Select value={categoryId || 'none'} onValueChange={(v) => setValue('categoryId', v === 'none' ? '' : v)}>
+          <SelectTrigger>
+            <SelectValue placeholder="Select category..." />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="none">No Category</SelectItem>
+            {categories.map((c) => (
+              <SelectItem key={c.id} value={c.id}>{c.name}</SelectItem>
+            ))}
+          </SelectContent>
+        </Select>
+      </div>
+      <div className="grid grid-cols-3 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="p-price">Price</Label>
+          <Input id="p-price" type="number" step="0.01" min="0" {...register('price')} placeholder="0.00" />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="p-min-price">Min Price</Label>
+          <Input id="p-min-price" type="number" step="0.01" min="0" {...register('minPrice')} placeholder="0.00" />
+        </div>
+        {isRental && (
+          <div className="space-y-2">
+            <Label htmlFor="p-rental-rate">Rental / Month</Label>
+            <Input id="p-rental-rate" type="number" step="0.01" min="0" {...register('rentalRateMonthly')} placeholder="0.00" />
+          </div>
+        )}
+      </div>
+      {!isSerialized && (
+        <div className="grid grid-cols-2 gap-4">
+          <div className="space-y-2">
+            <Label htmlFor="p-qty">Qty On Hand</Label>
+            <Input id="p-qty" type="number" min="0" {...register('qtyOnHand')} />
+          </div>
+          <div className="space-y-2">
+            <Label htmlFor="p-reorder">Reorder Point</Label>
+            <Input id="p-reorder" type="number" min="0" {...register('qtyReorderPoint')} placeholder="—" />
+          </div>
+        </div>
+      )}
+      <div className="space-y-2">
+        <Label htmlFor="p-desc">Description</Label>
+        <textarea
+          id="p-desc"
+          {...register('description')}
+          rows={3}
+          placeholder="Product description..."
+          className="w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring resize-none"
+        />
+      </div>
+      <div className="space-y-2">
+        <Label className="text-sm font-medium">Options</Label>
+        <div className="flex flex-wrap gap-4">
+          <label className="flex items-center gap-2 text-sm cursor-pointer">
+            <input type="checkbox" checked={isSerialized} onChange={(e) => setValue('isSerialized', e.target.checked)} className="h-4 w-4" />
+            Serialized (track individual units)
+          </label>
+          <label className="flex items-center gap-2 text-sm cursor-pointer">
+            <input type="checkbox" checked={isRental} onChange={(e) => setValue('isRental', e.target.checked)} className="h-4 w-4" />
+            Available for Rental
+          </label>
+          <label className="flex items-center gap-2 text-sm cursor-pointer">
+            <input type="checkbox" checked={isDualUseRepair} onChange={(e) => setValue('isDualUseRepair', e.target.checked)} className="h-4 w-4" />
+            Available as Repair Line Item
+          </label>
+          <label className="flex items-center gap-2 text-sm cursor-pointer">
+            <input type="checkbox" checked={isActive} onChange={(e) => setValue('isActive', e.target.checked)} className="h-4 w-4" />
+            Active
+          </label>
+        </div>
+      </div>
+      <Button type="submit" disabled={loading} className="w-full">
+        {loading ? 'Saving...' : defaultValues?.id ? 'Save Changes' : 'Create Product'}
+      </Button>
+    </form>
+  )
+}
diff --git a/packages/admin/src/components/inventory/supplier-form.tsx b/packages/admin/src/components/inventory/supplier-form.tsx
new file mode 100644
index 0000000..1b3942f
--- /dev/null
+++ b/packages/admin/src/components/inventory/supplier-form.tsx
@@ -0,0 +1,88 @@
+import { useForm } from 'react-hook-form'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import type { Supplier } from '@/types/inventory'
+
+interface Props {
+  defaultValues?: Partial<Supplier>
+  onSubmit: (data: Record<string, unknown>) => void
+  onDelete?: () => void
+  loading?: boolean
+  deleteLoading?: boolean
+}
+
+export function SupplierForm({ defaultValues, onSubmit, onDelete, loading, deleteLoading }: Props) {
+  const { register, handleSubmit } = useForm({
+    defaultValues: {
+      name: defaultValues?.name ?? '',
+      contactName: defaultValues?.contactName ?? '',
+      email: defaultValues?.email ?? '',
+      phone: defaultValues?.phone ?? '',
+      website: defaultValues?.website ?? '',
+      accountNumber: defaultValues?.accountNumber ?? '',
+      paymentTerms: defaultValues?.paymentTerms ?? '',
+    },
+  })
+
+  function handleFormSubmit(data: Record<string, string>) {
+    onSubmit({
+      name: data.name,
+      contactName: data.contactName || undefined,
+      email: data.email || undefined,
+      phone: data.phone || undefined,
+      website: data.website || undefined,
+      accountNumber: data.accountNumber || undefined,
+      paymentTerms: data.paymentTerms || undefined,
+    })
+  }
+
+  return (
+    <form onSubmit={handleSubmit(handleFormSubmit)} className="space-y-4">
+      <div className="space-y-2">
+        <Label htmlFor="sup-name">Name *</Label>
+        <Input id="sup-name" {...register('name')} placeholder="e.g. Fender Musical Instruments" required />
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="sup-contact">Contact Name</Label>
+          <Input id="sup-contact" {...register('contactName')} placeholder="Jane Smith" />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="sup-email">Email</Label>
+          <Input id="sup-email" type="email" {...register('email')} placeholder="orders@supplier.com" />
+        </div>
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="sup-phone">Phone</Label>
+          <Input id="sup-phone" {...register('phone')} placeholder="555-0100" />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="sup-website">Website</Label>
+          <Input id="sup-website" {...register('website')} placeholder="https://supplier.com" />
+        </div>
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="sup-acct">Account Number</Label>
+          <Input id="sup-acct" {...register('accountNumber')} placeholder="ACC-12345" />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="sup-terms">Payment Terms</Label>
+          <Input id="sup-terms" {...register('paymentTerms')} placeholder="Net 30" />
+        </div>
+      </div>
+      <div className="flex gap-2 pt-2">
+        <Button type="submit" disabled={loading} className="flex-1">
+          {loading ? 'Saving...' : defaultValues?.id ? 'Save Changes' : 'Create Supplier'}
+        </Button>
+        {onDelete && (
+          <Button type="button" variant="destructive" disabled={deleteLoading} onClick={onDelete}>
+            {deleteLoading ? 'Deleting...' : 'Delete'}
+          </Button>
+        )}
+      </div>
+    </form>
+  )
+}
diff --git a/packages/admin/src/components/ui/alert-dialog.tsx b/packages/admin/src/components/ui/alert-dialog.tsx
new file mode 100644
index 0000000..e661935
--- /dev/null
+++ b/packages/admin/src/components/ui/alert-dialog.tsx
@@ -0,0 +1,142 @@
+import * as React from "react"
+import { AlertDialog as AlertDialogPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+import { buttonVariants } from "@/components/ui/button"
+
+function AlertDialog({
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Root>) {
+  return <AlertDialogPrimitive.Root data-slot="alert-dialog" {...props} />
+}
+
+function AlertDialogTrigger({
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Trigger>) {
+  return <AlertDialogPrimitive.Trigger data-slot="alert-dialog-trigger" {...props} />
+}
+
+function AlertDialogPortal({
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Portal>) {
+  return <AlertDialogPrimitive.Portal data-slot="alert-dialog-portal" {...props} />
+}
+
+function AlertDialogOverlay({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Overlay>) {
+  return (
+    <AlertDialogPrimitive.Overlay
+      data-slot="alert-dialog-overlay"
+      className={cn(
+        "fixed inset-0 z-50 bg-black/50 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:animate-in data-[state=open]:fade-in-0",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogContent({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Content>) {
+  return (
+    <AlertDialogPortal>
+      <AlertDialogOverlay />
+      <AlertDialogPrimitive.Content
+        data-slot="alert-dialog-content"
+        className={cn(
+          "fixed top-[50%] left-[50%] z-50 grid w-full max-w-[calc(100%-2rem)] translate-x-[-50%] translate-y-[-50%] gap-4 rounded-lg border bg-background p-6 shadow-lg duration-200 outline-none data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95 sm:max-w-lg",
+          className
+        )}
+        {...props}
+      />
+    </AlertDialogPortal>
+  )
+}
+
+function AlertDialogHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-dialog-header"
+      className={cn("flex flex-col gap-2 text-center sm:text-left", className)}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogFooter({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-dialog-footer"
+      className={cn("flex flex-col-reverse gap-2 sm:flex-row sm:justify-end", className)}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogTitle({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Title>) {
+  return (
+    <AlertDialogPrimitive.Title
+      data-slot="alert-dialog-title"
+      className={cn("text-lg font-semibold", className)}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogDescription({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Description>) {
+  return (
+    <AlertDialogPrimitive.Description
+      data-slot="alert-dialog-description"
+      className={cn("text-sm text-muted-foreground", className)}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogAction({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Action>) {
+  return (
+    <AlertDialogPrimitive.Action
+      className={cn(buttonVariants(), className)}
+      {...props}
+    />
+  )
+}
+
+function AlertDialogCancel({
+  className,
+  ...props
+}: React.ComponentProps<typeof AlertDialogPrimitive.Cancel>) {
+  return (
+    <AlertDialogPrimitive.Cancel
+      className={cn(buttonVariants({ variant: "outline" }), className)}
+      {...props}
+    />
+  )
+}
+
+export {
+  AlertDialog,
+  AlertDialogPortal,
+  AlertDialogOverlay,
+  AlertDialogTrigger,
+  AlertDialogContent,
+  AlertDialogHeader,
+  AlertDialogFooter,
+  AlertDialogTitle,
+  AlertDialogDescription,
+  AlertDialogAction,
+  AlertDialogCancel,
+}
diff --git a/packages/admin/src/components/ui/checkbox.tsx b/packages/admin/src/components/ui/checkbox.tsx
new file mode 100644
index 0000000..40ab9c5
--- /dev/null
+++ b/packages/admin/src/components/ui/checkbox.tsx
@@ -0,0 +1,30 @@
+import * as React from "react"
+import { Checkbox as CheckboxPrimitive } from "radix-ui"
+import { CheckIcon } from "lucide-react"
+
+import { cn } from "@/lib/utils"
+
+function Checkbox({
+  className,
+  ...props
+}: React.ComponentProps<typeof CheckboxPrimitive.Root>) {
+  return (
+    <CheckboxPrimitive.Root
+      data-slot="checkbox"
+      className={cn(
+        "peer size-4 shrink-0 rounded-[4px] border border-input shadow-xs transition-shadow outline-none focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50 disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=checked]:text-primary-foreground data-[state=checked]:border-primary dark:bg-input/30 dark:data-[state=checked]:bg-primary",
+        className
+      )}
+      {...props}
+    >
+      <CheckboxPrimitive.Indicator
+        data-slot="checkbox-indicator"
+        className="flex items-center justify-center text-current transition-none"
+      >
+        <CheckIcon className="size-3.5" />
+      </CheckboxPrimitive.Indicator>
+    </CheckboxPrimitive.Root>
+  )
+}
+
+export { Checkbox }
diff --git a/packages/admin/src/routeTree.gen.ts b/packages/admin/src/routeTree.gen.ts
index 9c8ed83..56f3fee 100644
--- a/packages/admin/src/routeTree.gen.ts
+++ b/packages/admin/src/routeTree.gen.ts
@@ -21,6 +21,7 @@ import { Route as AuthenticatedRolesIndexRouteImport } from './routes/_authentic
 import { Route as AuthenticatedRepairsIndexRouteImport } from './routes/_authenticated/repairs/index'
 import { Route as AuthenticatedRepairBatchesIndexRouteImport } from './routes/_authenticated/repair-batches/index'
 import { Route as AuthenticatedMembersIndexRouteImport } from './routes/_authenticated/members/index'
+import { Route as AuthenticatedInventoryIndexRouteImport } from './routes/_authenticated/inventory/index'
 import { Route as AuthenticatedFilesIndexRouteImport } from './routes/_authenticated/files/index'
 import { Route as AuthenticatedAccountsIndexRouteImport } from './routes/_authenticated/accounts/index'
 import { Route as AuthenticatedRolesNewRouteImport } from './routes/_authenticated/roles/new'
@@ -31,6 +32,8 @@ import { Route as AuthenticatedRepairsTicketIdRouteImport } from './routes/_auth
 import { Route as AuthenticatedRepairBatchesNewRouteImport } from './routes/_authenticated/repair-batches/new'
 import { Route as AuthenticatedRepairBatchesBatchIdRouteImport } from './routes/_authenticated/repair-batches/$batchId'
 import { Route as AuthenticatedMembersMemberIdRouteImport } from './routes/_authenticated/members/$memberId'
+import { Route as AuthenticatedInventoryCategoriesRouteImport } from './routes/_authenticated/inventory/categories'
+import { Route as AuthenticatedInventoryProductIdRouteImport } from './routes/_authenticated/inventory/$productId'
 import { Route as AuthenticatedAccountsNewRouteImport } from './routes/_authenticated/accounts/new'
 import { Route as AuthenticatedAccountsAccountIdRouteImport } from './routes/_authenticated/accounts/$accountId'
 import { Route as AuthenticatedLessonsTemplatesIndexRouteImport } from './routes/_authenticated/lessons/templates/index'
@@ -38,6 +41,7 @@ import { Route as AuthenticatedLessonsSessionsIndexRouteImport } from './routes/
 import { Route as AuthenticatedLessonsScheduleIndexRouteImport } from './routes/_authenticated/lessons/schedule/index'
 import { Route as AuthenticatedLessonsPlansIndexRouteImport } from './routes/_authenticated/lessons/plans/index'
 import { Route as AuthenticatedLessonsEnrollmentsIndexRouteImport } from './routes/_authenticated/lessons/enrollments/index'
+import { Route as AuthenticatedInventorySuppliersIndexRouteImport } from './routes/_authenticated/inventory/suppliers/index'
 import { Route as AuthenticatedAccountsAccountIdIndexRouteImport } from './routes/_authenticated/accounts/$accountId/index'
 import { Route as AuthenticatedLessonsTemplatesNewRouteImport } from './routes/_authenticated/lessons/templates/new'
 import { Route as AuthenticatedLessonsTemplatesTemplateIdRouteImport } from './routes/_authenticated/lessons/templates/$templateId'
@@ -114,6 +118,12 @@ const AuthenticatedMembersIndexRoute =
     path: '/members/',
     getParentRoute: () => AuthenticatedRoute,
   } as any)
+const AuthenticatedInventoryIndexRoute =
+  AuthenticatedInventoryIndexRouteImport.update({
+    id: '/inventory/',
+    path: '/inventory/',
+    getParentRoute: () => AuthenticatedRoute,
+  } as any)
 const AuthenticatedFilesIndexRoute = AuthenticatedFilesIndexRouteImport.update({
   id: '/files/',
   path: '/files/',
@@ -171,6 +181,18 @@ const AuthenticatedMembersMemberIdRoute =
     path: '/members/$memberId',
     getParentRoute: () => AuthenticatedRoute,
   } as any)
+const AuthenticatedInventoryCategoriesRoute =
+  AuthenticatedInventoryCategoriesRouteImport.update({
+    id: '/inventory/categories',
+    path: '/inventory/categories',
+    getParentRoute: () => AuthenticatedRoute,
+  } as any)
+const AuthenticatedInventoryProductIdRoute =
+  AuthenticatedInventoryProductIdRouteImport.update({
+    id: '/inventory/$productId',
+    path: '/inventory/$productId',
+    getParentRoute: () => AuthenticatedRoute,
+  } as any)
 const AuthenticatedAccountsNewRoute =
   AuthenticatedAccountsNewRouteImport.update({
     id: '/accounts/new',
@@ -213,6 +235,12 @@ const AuthenticatedLessonsEnrollmentsIndexRoute =
     path: '/lessons/enrollments/',
     getParentRoute: () => AuthenticatedRoute,
   } as any)
+const AuthenticatedInventorySuppliersIndexRoute =
+  AuthenticatedInventorySuppliersIndexRouteImport.update({
+    id: '/inventory/suppliers/',
+    path: '/inventory/suppliers/',
+    getParentRoute: () => AuthenticatedRoute,
+  } as any)
 const AuthenticatedAccountsAccountIdIndexRoute =
   AuthenticatedAccountsAccountIdIndexRouteImport.update({
     id: '/',
@@ -301,6 +329,8 @@ export interface FileRoutesByFullPath {
   '/users': typeof AuthenticatedUsersRoute
   '/accounts/$accountId': typeof AuthenticatedAccountsAccountIdRouteWithChildren
   '/accounts/new': typeof AuthenticatedAccountsNewRoute
+  '/inventory/$productId': typeof AuthenticatedInventoryProductIdRoute
+  '/inventory/categories': typeof AuthenticatedInventoryCategoriesRoute
   '/members/$memberId': typeof AuthenticatedMembersMemberIdRoute
   '/repair-batches/$batchId': typeof AuthenticatedRepairBatchesBatchIdRoute
   '/repair-batches/new': typeof AuthenticatedRepairBatchesNewRoute
@@ -311,6 +341,7 @@ export interface FileRoutesByFullPath {
   '/roles/new': typeof AuthenticatedRolesNewRoute
   '/accounts/': typeof AuthenticatedAccountsIndexRoute
   '/files/': typeof AuthenticatedFilesIndexRoute
+  '/inventory/': typeof AuthenticatedInventoryIndexRoute
   '/members/': typeof AuthenticatedMembersIndexRoute
   '/repair-batches/': typeof AuthenticatedRepairBatchesIndexRoute
   '/repairs/': typeof AuthenticatedRepairsIndexRoute
@@ -328,6 +359,7 @@ export interface FileRoutesByFullPath {
   '/lessons/templates/$templateId': typeof AuthenticatedLessonsTemplatesTemplateIdRoute
   '/lessons/templates/new': typeof AuthenticatedLessonsTemplatesNewRoute
   '/accounts/$accountId/': typeof AuthenticatedAccountsAccountIdIndexRoute
+  '/inventory/suppliers/': typeof AuthenticatedInventorySuppliersIndexRoute
   '/lessons/enrollments/': typeof AuthenticatedLessonsEnrollmentsIndexRoute
   '/lessons/plans/': typeof AuthenticatedLessonsPlansIndexRoute
   '/lessons/schedule/': typeof AuthenticatedLessonsScheduleIndexRoute
@@ -343,6 +375,8 @@ export interface FileRoutesByTo {
   '/users': typeof AuthenticatedUsersRoute
   '/': typeof AuthenticatedIndexRoute
   '/accounts/new': typeof AuthenticatedAccountsNewRoute
+  '/inventory/$productId': typeof AuthenticatedInventoryProductIdRoute
+  '/inventory/categories': typeof AuthenticatedInventoryCategoriesRoute
   '/members/$memberId': typeof AuthenticatedMembersMemberIdRoute
   '/repair-batches/$batchId': typeof AuthenticatedRepairBatchesBatchIdRoute
   '/repair-batches/new': typeof AuthenticatedRepairBatchesNewRoute
@@ -353,6 +387,7 @@ export interface FileRoutesByTo {
   '/roles/new': typeof AuthenticatedRolesNewRoute
   '/accounts': typeof AuthenticatedAccountsIndexRoute
   '/files': typeof AuthenticatedFilesIndexRoute
+  '/inventory': typeof AuthenticatedInventoryIndexRoute
   '/members': typeof AuthenticatedMembersIndexRoute
   '/repair-batches': typeof AuthenticatedRepairBatchesIndexRoute
   '/repairs': typeof AuthenticatedRepairsIndexRoute
@@ -370,6 +405,7 @@ export interface FileRoutesByTo {
   '/lessons/templates/$templateId': typeof AuthenticatedLessonsTemplatesTemplateIdRoute
   '/lessons/templates/new': typeof AuthenticatedLessonsTemplatesNewRoute
   '/accounts/$accountId': typeof AuthenticatedAccountsAccountIdIndexRoute
+  '/inventory/suppliers': typeof AuthenticatedInventorySuppliersIndexRoute
   '/lessons/enrollments': typeof AuthenticatedLessonsEnrollmentsIndexRoute
   '/lessons/plans': typeof AuthenticatedLessonsPlansIndexRoute
   '/lessons/schedule': typeof AuthenticatedLessonsScheduleIndexRoute
@@ -388,6 +424,8 @@ export interface FileRoutesById {
   '/_authenticated/': typeof AuthenticatedIndexRoute
   '/_authenticated/accounts/$accountId': typeof AuthenticatedAccountsAccountIdRouteWithChildren
   '/_authenticated/accounts/new': typeof AuthenticatedAccountsNewRoute
+  '/_authenticated/inventory/$productId': typeof AuthenticatedInventoryProductIdRoute
+  '/_authenticated/inventory/categories': typeof AuthenticatedInventoryCategoriesRoute
   '/_authenticated/members/$memberId': typeof AuthenticatedMembersMemberIdRoute
   '/_authenticated/repair-batches/$batchId': typeof AuthenticatedRepairBatchesBatchIdRoute
   '/_authenticated/repair-batches/new': typeof AuthenticatedRepairBatchesNewRoute
@@ -398,6 +436,7 @@ export interface FileRoutesById {
   '/_authenticated/roles/new': typeof AuthenticatedRolesNewRoute
   '/_authenticated/accounts/': typeof AuthenticatedAccountsIndexRoute
   '/_authenticated/files/': typeof AuthenticatedFilesIndexRoute
+  '/_authenticated/inventory/': typeof AuthenticatedInventoryIndexRoute
   '/_authenticated/members/': typeof AuthenticatedMembersIndexRoute
   '/_authenticated/repair-batches/': typeof AuthenticatedRepairBatchesIndexRoute
   '/_authenticated/repairs/': typeof AuthenticatedRepairsIndexRoute
@@ -415,6 +454,7 @@ export interface FileRoutesById {
   '/_authenticated/lessons/templates/$templateId': typeof AuthenticatedLessonsTemplatesTemplateIdRoute
   '/_authenticated/lessons/templates/new': typeof AuthenticatedLessonsTemplatesNewRoute
   '/_authenticated/accounts/$accountId/': typeof AuthenticatedAccountsAccountIdIndexRoute
+  '/_authenticated/inventory/suppliers/': typeof AuthenticatedInventorySuppliersIndexRoute
   '/_authenticated/lessons/enrollments/': typeof AuthenticatedLessonsEnrollmentsIndexRoute
   '/_authenticated/lessons/plans/': typeof AuthenticatedLessonsPlansIndexRoute
   '/_authenticated/lessons/schedule/': typeof AuthenticatedLessonsScheduleIndexRoute
@@ -433,6 +473,8 @@ export interface FileRouteTypes {
     | '/users'
     | '/accounts/$accountId'
     | '/accounts/new'
+    | '/inventory/$productId'
+    | '/inventory/categories'
     | '/members/$memberId'
     | '/repair-batches/$batchId'
     | '/repair-batches/new'
@@ -443,6 +485,7 @@ export interface FileRouteTypes {
     | '/roles/new'
     | '/accounts/'
     | '/files/'
+    | '/inventory/'
     | '/members/'
     | '/repair-batches/'
     | '/repairs/'
@@ -460,6 +503,7 @@ export interface FileRouteTypes {
     | '/lessons/templates/$templateId'
     | '/lessons/templates/new'
     | '/accounts/$accountId/'
+    | '/inventory/suppliers/'
     | '/lessons/enrollments/'
     | '/lessons/plans/'
     | '/lessons/schedule/'
@@ -475,6 +519,8 @@ export interface FileRouteTypes {
     | '/users'
     | '/'
     | '/accounts/new'
+    | '/inventory/$productId'
+    | '/inventory/categories'
     | '/members/$memberId'
     | '/repair-batches/$batchId'
     | '/repair-batches/new'
@@ -485,6 +531,7 @@ export interface FileRouteTypes {
     | '/roles/new'
     | '/accounts'
     | '/files'
+    | '/inventory'
     | '/members'
     | '/repair-batches'
     | '/repairs'
@@ -502,6 +549,7 @@ export interface FileRouteTypes {
     | '/lessons/templates/$templateId'
     | '/lessons/templates/new'
     | '/accounts/$accountId'
+    | '/inventory/suppliers'
     | '/lessons/enrollments'
     | '/lessons/plans'
     | '/lessons/schedule'
@@ -519,6 +567,8 @@ export interface FileRouteTypes {
     | '/_authenticated/'
     | '/_authenticated/accounts/$accountId'
     | '/_authenticated/accounts/new'
+    | '/_authenticated/inventory/$productId'
+    | '/_authenticated/inventory/categories'
     | '/_authenticated/members/$memberId'
     | '/_authenticated/repair-batches/$batchId'
     | '/_authenticated/repair-batches/new'
@@ -529,6 +579,7 @@ export interface FileRouteTypes {
     | '/_authenticated/roles/new'
     | '/_authenticated/accounts/'
     | '/_authenticated/files/'
+    | '/_authenticated/inventory/'
     | '/_authenticated/members/'
     | '/_authenticated/repair-batches/'
     | '/_authenticated/repairs/'
@@ -546,6 +597,7 @@ export interface FileRouteTypes {
     | '/_authenticated/lessons/templates/$templateId'
     | '/_authenticated/lessons/templates/new'
     | '/_authenticated/accounts/$accountId/'
+    | '/_authenticated/inventory/suppliers/'
     | '/_authenticated/lessons/enrollments/'
     | '/_authenticated/lessons/plans/'
     | '/_authenticated/lessons/schedule/'
@@ -645,6 +697,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof AuthenticatedMembersIndexRouteImport
       parentRoute: typeof AuthenticatedRoute
     }
+    '/_authenticated/inventory/': {
+      id: '/_authenticated/inventory/'
+      path: '/inventory'
+      fullPath: '/inventory/'
+      preLoaderRoute: typeof AuthenticatedInventoryIndexRouteImport
+      parentRoute: typeof AuthenticatedRoute
+    }
     '/_authenticated/files/': {
       id: '/_authenticated/files/'
       path: '/files'
@@ -715,6 +774,20 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof AuthenticatedMembersMemberIdRouteImport
       parentRoute: typeof AuthenticatedRoute
     }
+    '/_authenticated/inventory/categories': {
+      id: '/_authenticated/inventory/categories'
+      path: '/inventory/categories'
+      fullPath: '/inventory/categories'
+      preLoaderRoute: typeof AuthenticatedInventoryCategoriesRouteImport
+      parentRoute: typeof AuthenticatedRoute
+    }
+    '/_authenticated/inventory/$productId': {
+      id: '/_authenticated/inventory/$productId'
+      path: '/inventory/$productId'
+      fullPath: '/inventory/$productId'
+      preLoaderRoute: typeof AuthenticatedInventoryProductIdRouteImport
+      parentRoute: typeof AuthenticatedRoute
+    }
     '/_authenticated/accounts/new': {
       id: '/_authenticated/accounts/new'
       path: '/accounts/new'
@@ -764,6 +837,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof AuthenticatedLessonsEnrollmentsIndexRouteImport
       parentRoute: typeof AuthenticatedRoute
     }
+    '/_authenticated/inventory/suppliers/': {
+      id: '/_authenticated/inventory/suppliers/'
+      path: '/inventory/suppliers'
+      fullPath: '/inventory/suppliers/'
+      preLoaderRoute: typeof AuthenticatedInventorySuppliersIndexRouteImport
+      parentRoute: typeof AuthenticatedRoute
+    }
     '/_authenticated/accounts/$accountId/': {
       id: '/_authenticated/accounts/$accountId/'
       path: '/'
@@ -896,6 +976,8 @@ interface AuthenticatedRouteChildren {
   AuthenticatedIndexRoute: typeof AuthenticatedIndexRoute
   AuthenticatedAccountsAccountIdRoute: typeof AuthenticatedAccountsAccountIdRouteWithChildren
   AuthenticatedAccountsNewRoute: typeof AuthenticatedAccountsNewRoute
+  AuthenticatedInventoryProductIdRoute: typeof AuthenticatedInventoryProductIdRoute
+  AuthenticatedInventoryCategoriesRoute: typeof AuthenticatedInventoryCategoriesRoute
   AuthenticatedMembersMemberIdRoute: typeof AuthenticatedMembersMemberIdRoute
   AuthenticatedRepairBatchesBatchIdRoute: typeof AuthenticatedRepairBatchesBatchIdRoute
   AuthenticatedRepairBatchesNewRoute: typeof AuthenticatedRepairBatchesNewRoute
@@ -906,6 +988,7 @@ interface AuthenticatedRouteChildren {
   AuthenticatedRolesNewRoute: typeof AuthenticatedRolesNewRoute
   AuthenticatedAccountsIndexRoute: typeof AuthenticatedAccountsIndexRoute
   AuthenticatedFilesIndexRoute: typeof AuthenticatedFilesIndexRoute
+  AuthenticatedInventoryIndexRoute: typeof AuthenticatedInventoryIndexRoute
   AuthenticatedMembersIndexRoute: typeof AuthenticatedMembersIndexRoute
   AuthenticatedRepairBatchesIndexRoute: typeof AuthenticatedRepairBatchesIndexRoute
   AuthenticatedRepairsIndexRoute: typeof AuthenticatedRepairsIndexRoute
@@ -917,6 +1000,7 @@ interface AuthenticatedRouteChildren {
   AuthenticatedLessonsSessionsSessionIdRoute: typeof AuthenticatedLessonsSessionsSessionIdRoute
   AuthenticatedLessonsTemplatesTemplateIdRoute: typeof AuthenticatedLessonsTemplatesTemplateIdRoute
   AuthenticatedLessonsTemplatesNewRoute: typeof AuthenticatedLessonsTemplatesNewRoute
+  AuthenticatedInventorySuppliersIndexRoute: typeof AuthenticatedInventorySuppliersIndexRoute
   AuthenticatedLessonsEnrollmentsIndexRoute: typeof AuthenticatedLessonsEnrollmentsIndexRoute
   AuthenticatedLessonsPlansIndexRoute: typeof AuthenticatedLessonsPlansIndexRoute
   AuthenticatedLessonsScheduleIndexRoute: typeof AuthenticatedLessonsScheduleIndexRoute
@@ -934,6 +1018,8 @@ const AuthenticatedRouteChildren: AuthenticatedRouteChildren = {
   AuthenticatedAccountsAccountIdRoute:
     AuthenticatedAccountsAccountIdRouteWithChildren,
   AuthenticatedAccountsNewRoute: AuthenticatedAccountsNewRoute,
+  AuthenticatedInventoryProductIdRoute: AuthenticatedInventoryProductIdRoute,
+  AuthenticatedInventoryCategoriesRoute: AuthenticatedInventoryCategoriesRoute,
   AuthenticatedMembersMemberIdRoute: AuthenticatedMembersMemberIdRoute,
   AuthenticatedRepairBatchesBatchIdRoute:
     AuthenticatedRepairBatchesBatchIdRoute,
@@ -945,6 +1031,7 @@ const AuthenticatedRouteChildren: AuthenticatedRouteChildren = {
   AuthenticatedRolesNewRoute: AuthenticatedRolesNewRoute,
   AuthenticatedAccountsIndexRoute: AuthenticatedAccountsIndexRoute,
   AuthenticatedFilesIndexRoute: AuthenticatedFilesIndexRoute,
+  AuthenticatedInventoryIndexRoute: AuthenticatedInventoryIndexRoute,
   AuthenticatedMembersIndexRoute: AuthenticatedMembersIndexRoute,
   AuthenticatedRepairBatchesIndexRoute: AuthenticatedRepairBatchesIndexRoute,
   AuthenticatedRepairsIndexRoute: AuthenticatedRepairsIndexRoute,
@@ -960,6 +1047,8 @@ const AuthenticatedRouteChildren: AuthenticatedRouteChildren = {
   AuthenticatedLessonsTemplatesTemplateIdRoute:
     AuthenticatedLessonsTemplatesTemplateIdRoute,
   AuthenticatedLessonsTemplatesNewRoute: AuthenticatedLessonsTemplatesNewRoute,
+  AuthenticatedInventorySuppliersIndexRoute:
+    AuthenticatedInventorySuppliersIndexRoute,
   AuthenticatedLessonsEnrollmentsIndexRoute:
     AuthenticatedLessonsEnrollmentsIndexRoute,
   AuthenticatedLessonsPlansIndexRoute: AuthenticatedLessonsPlansIndexRoute,
diff --git a/packages/admin/src/routes/_authenticated.tsx b/packages/admin/src/routes/_authenticated.tsx
index 2559155..16adec0 100644
--- a/packages/admin/src/routes/_authenticated.tsx
+++ b/packages/admin/src/routes/_authenticated.tsx
@@ -8,7 +8,7 @@ import { myPermissionsOptions } from '@/api/rbac'
 import { moduleListOptions } from '@/api/modules'
 import { Avatar } from '@/components/shared/avatar-upload'
 import { Button } from '@/components/ui/button'
-import { Users, UserRound, HelpCircle, Shield, UserCog, LogOut, User, Wrench, Package, ClipboardList, FolderOpen, KeyRound, Settings, PanelLeftClose, PanelLeft, CalendarDays, GraduationCap, CalendarRange, BookOpen, BookMarked } from 'lucide-react'
+import { Users, UserRound, HelpCircle, Shield, UserCog, LogOut, User, Wrench, Package, ClipboardList, FolderOpen, KeyRound, Settings, PanelLeftClose, PanelLeft, CalendarDays, GraduationCap, CalendarRange, BookOpen, BookMarked, Package2, Tag, Truck } from 'lucide-react'
 
 export const Route = createFileRoute('/_authenticated')({
   beforeLoad: () => {
@@ -143,6 +143,7 @@ function AuthenticatedLayout() {
   const canViewAccounts = !permissionsLoaded || hasPermission('accounts.view')
   const canViewRepairs = !permissionsLoaded || hasPermission('repairs.view')
   const canViewLessons = !permissionsLoaded || hasPermission('lessons.view')
+  const canViewInventory = !permissionsLoaded || hasPermission('inventory.view')
   const canViewUsers = !permissionsLoaded || hasPermission('users.view')
 
   const [collapsed, setCollapsed] = useState(false)
@@ -178,6 +179,13 @@ function AuthenticatedLayout() {
                 <NavLink to="/members" icon={<UserRound className="h-4 w-4" />} label="Members" collapsed={collapsed} />
               </NavGroup>
             )}
+            {isModuleEnabled('inventory') && canViewInventory && (
+              <NavGroup label="Inventory" collapsed={collapsed}>
+                <NavLink to="/inventory" icon={<Package2 className="h-4 w-4" />} label="Products" collapsed={collapsed} />
+                <NavLink to="/inventory/categories" icon={<Tag className="h-4 w-4" />} label="Categories" collapsed={collapsed} />
+                <NavLink to="/inventory/suppliers" icon={<Truck className="h-4 w-4" />} label="Suppliers" collapsed={collapsed} />
+              </NavGroup>
+            )}
             {isModuleEnabled('repairs') && canViewRepairs && (
               <NavGroup label="Repairs" collapsed={collapsed}>
                 <NavLink to="/repairs" icon={<Wrench className="h-4 w-4" />} label="Tickets" collapsed={collapsed} />
diff --git a/packages/admin/src/routes/_authenticated/inventory/$productId.tsx b/packages/admin/src/routes/_authenticated/inventory/$productId.tsx
new file mode 100644
index 0000000..7e12897
--- /dev/null
+++ b/packages/admin/src/routes/_authenticated/inventory/$productId.tsx
@@ -0,0 +1,786 @@
+import { useState } from 'react'
+import { createFileRoute, useParams, useNavigate } from '@tanstack/react-router'
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import {
+  productDetailOptions, productMutations, productKeys,
+  unitListOptions, unitMutations, unitKeys,
+  productSupplierListOptions, productSupplierMutations, productSupplierKeys,
+  priceHistoryOptions, supplierListOptions,
+  stockReceiptListOptions, stockReceiptMutations, stockReceiptKeys,
+} from '@/api/inventory'
+import { ProductForm } from '@/components/inventory/product-form'
+import { InventoryUnitForm } from '@/components/inventory/inventory-unit-form'
+import { Button } from '@/components/ui/button'
+import { Badge } from '@/components/ui/badge'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Skeleton } from '@/components/ui/skeleton'
+import { Checkbox } from '@/components/ui/checkbox'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
+import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogTrigger } from '@/components/ui/dialog'
+import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from '@/components/ui/table'
+import { AlertDialog, AlertDialogAction, AlertDialogCancel, AlertDialogContent, AlertDialogDescription, AlertDialogFooter, AlertDialogHeader, AlertDialogTitle, AlertDialogTrigger } from '@/components/ui/alert-dialog'
+import { ArrowLeft, Plus, Pencil, Star, Trash2 } from 'lucide-react'
+import { toast } from 'sonner'
+import { cn } from '@/lib/utils'
+import { useAuthStore } from '@/stores/auth.store'
+import type { InventoryUnit, ProductSupplier, StockReceipt, UnitCondition, UnitStatus } from '@/types/inventory'
+
+const CONDITION_CLASSES: Record<UnitCondition, string> = {
+  new: 'bg-blue-100 text-blue-800 border border-blue-300',
+  excellent: 'bg-green-100 text-green-800 border border-green-300',
+  good: 'bg-emerald-100 text-emerald-800 border border-emerald-300',
+  fair: 'bg-yellow-100 text-yellow-800 border border-yellow-300',
+  poor: 'bg-red-100 text-red-800 border border-red-300',
+}
+
+const STATUS_CLASSES: Record<UnitStatus, string> = {
+  available: 'bg-green-100 text-green-800 border border-green-300',
+  sold: 'bg-gray-100 text-gray-600 border border-gray-300',
+  rented: 'bg-purple-100 text-purple-800 border border-purple-300',
+  on_trial: 'bg-cyan-100 text-cyan-800 border border-cyan-300',
+  in_repair: 'bg-orange-100 text-orange-800 border border-orange-300',
+  layaway: 'bg-indigo-100 text-indigo-800 border border-indigo-300',
+  lost: 'bg-red-100 text-red-800 border border-red-300',
+  retired: 'bg-gray-100 text-gray-400 border border-gray-200',
+}
+
+const STATUS_LABELS: Record<UnitStatus, string> = {
+  available: 'Available', sold: 'Sold', rented: 'Rented', on_trial: 'On Trial',
+  in_repair: 'In Repair', layaway: 'Layaway', lost: 'Lost', retired: 'Retired',
+}
+
+export const Route = createFileRoute('/_authenticated/inventory/$productId')({
+  validateSearch: (search: Record<string, unknown>) => ({
+    tab: (search.tab as string) || 'details',
+  }),
+  component: ProductDetailPage,
+})
+
+function ProductDetailPage() {
+  const { productId } = useParams({ from: '/_authenticated/inventory/$productId' })
+  const search = Route.useSearch()
+  const navigate = useNavigate()
+  const queryClient = useQueryClient()
+  const hasPermission = useAuthStore((s) => s.hasPermission)
+  const tab = search.tab ?? 'details'
+  const [addUnitOpen, setAddUnitOpen] = useState(false)
+  const [editUnit, setEditUnit] = useState<InventoryUnit | null>(null)
+  const [qtyEdit, setQtyEdit] = useState<string>('')
+  const [addSupplierOpen, setAddSupplierOpen] = useState(false)
+  const [editSupplier, setEditSupplier] = useState<ProductSupplier | null>(null)
+  const [addReceiptOpen, setAddReceiptOpen] = useState(false)
+
+  const { data: product, isLoading } = useQuery(productDetailOptions(productId))
+  const { data: unitsData } = useQuery({ ...unitListOptions(productId), enabled: tab === 'units' })
+  const units = unitsData?.data ?? []
+
+  const { data: suppliersData } = useQuery({ ...productSupplierListOptions(productId), enabled: tab === 'suppliers' })
+  const linkedSuppliers = suppliersData?.data ?? []
+
+  const { data: priceHistoryData } = useQuery({ ...priceHistoryOptions(productId), enabled: tab === 'price-history' })
+  const priceHistoryRows = priceHistoryData?.data ?? []
+
+  const { data: stockReceiptsData } = useQuery({ ...stockReceiptListOptions(productId), enabled: tab === 'stock-receipts' })
+  const stockReceiptRows = stockReceiptsData?.data ?? []
+
+
+  const updateMutation = useMutation({
+    mutationFn: (data: Record<string, unknown>) => productMutations.update(productId, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: productKeys.detail(productId) })
+      queryClient.invalidateQueries({ queryKey: productKeys.all })
+      toast.success('Product updated')
+    },
+    onError: (err) => toast.error(err instanceof Error ? err.message : 'Update failed'),
+  })
+
+  const createUnitMutation = useMutation({
+    mutationFn: (data: Record<string, unknown>) => unitMutations.create(productId, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: unitKeys.byProduct(productId) })
+      toast.success('Unit added')
+      setAddUnitOpen(false)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const updateUnitMutation = useMutation({
+    mutationFn: ({ id, data }: { id: string; data: Record<string, unknown> }) =>
+      unitMutations.update(id, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: unitKeys.byProduct(productId) })
+      toast.success('Unit updated')
+      setEditUnit(null)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const addSupplierMutation = useMutation({
+    mutationFn: (data: Record<string, unknown>) => productSupplierMutations.create(productId, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: productSupplierKeys.byProduct(productId) })
+      toast.success('Supplier linked')
+      setAddSupplierOpen(false)
+    },
+    onError: (err) => toast.error(err instanceof Error ? err.message : 'Failed'),
+  })
+
+  const updateSupplierMutation = useMutation({
+    mutationFn: ({ id, data }: { id: string; data: Record<string, unknown> }) =>
+      productSupplierMutations.update(productId, id, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: productSupplierKeys.byProduct(productId) })
+      toast.success('Supplier updated')
+      setEditSupplier(null)
+    },
+    onError: (err) => toast.error(err instanceof Error ? err.message : 'Failed'),
+  })
+
+  const removeSupplierMutation = useMutation({
+    mutationFn: (id: string) => productSupplierMutations.delete(productId, id),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: productSupplierKeys.byProduct(productId) })
+      toast.success('Supplier removed')
+      setEditSupplier(null)
+    },
+    onError: (err) => toast.error(err instanceof Error ? err.message : 'Failed'),
+  })
+
+  const createReceiptMutation = useMutation({
+    mutationFn: (data: Record<string, unknown>) => stockReceiptMutations.create(productId, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: stockReceiptKeys.byProduct(productId) })
+      queryClient.invalidateQueries({ queryKey: productKeys.detail(productId) })
+      toast.success('Stock receipt recorded')
+      setAddReceiptOpen(false)
+    },
+    onError: (err) => toast.error(err instanceof Error ? err.message : 'Failed'),
+  })
+
+  function setTab(t: string) {
+    navigate({ to: '/inventory/$productId', params: { productId }, search: { tab: t } as any })
+  }
+
+  function handleQtySave() {
+    const qty = parseInt(qtyEdit, 10)
+    if (isNaN(qty) || qty < 0) return
+    updateMutation.mutate({ qtyOnHand: qty })
+  }
+
+  if (isLoading) {
+    return (
+      <div className="space-y-4">
+        <Skeleton className="h-8 w-48" />
+        <Skeleton className="h-10 w-full" />
+        <Skeleton className="h-64 w-full max-w-lg" />
+      </div>
+    )
+  }
+
+  if (!product) return <p className="text-muted-foreground">Product not found</p>
+
+  const tabs = [
+    { key: 'details', label: 'Details' },
+    { key: 'units', label: product.isSerialized ? 'Units' : 'Quantity' },
+    { key: 'suppliers', label: 'Suppliers' },
+    { key: 'stock-receipts', label: 'Stock Receipts' },
+    { key: 'price-history', label: 'Price History' },
+  ]
+
+  return (
+    <div className="space-y-6">
+      {/* Header */}
+      <div className="flex items-center gap-3">
+        <Button variant="ghost" size="sm" onClick={() => navigate({ to: '/inventory', search: {} as any })}>
+          <ArrowLeft className="h-4 w-4" />
+        </Button>
+        <div className="min-w-0">
+          <div className="flex items-center gap-2 flex-wrap">
+            <h1 className="text-2xl font-bold">{product.name}</h1>
+            {product.sku && <span className="font-mono text-sm text-muted-foreground bg-muted px-2 py-0.5 rounded">{product.sku}</span>}
+            {product.isActive ? <Badge>Active</Badge> : <Badge variant="secondary">Inactive</Badge>}
+          </div>
+          <p className="text-sm text-muted-foreground mt-0.5">
+            {[product.brand, product.model].filter(Boolean).join(' · ') || 'No brand/model'}
+          </p>
+        </div>
+      </div>
+
+      {/* Tabs */}
+      <nav className="flex gap-1 border-b">
+        {tabs.map((t) => (
+          <button
+            key={t.key}
+            onClick={() => setTab(t.key)}
+            className={cn(
+              'px-4 py-2 text-sm font-medium border-b-2 -mb-px transition-colors',
+              tab === t.key
+                ? 'border-primary text-foreground'
+                : 'border-transparent text-muted-foreground hover:text-foreground hover:border-border',
+            )}
+          >
+            {t.label}
+          </button>
+        ))}
+      </nav>
+
+      {/* Details tab */}
+      {tab === 'details' && (
+        <div className="max-w-lg">
+          <ProductForm
+            defaultValues={product}
+            onSubmit={updateMutation.mutate}
+            loading={updateMutation.isPending}
+          />
+        </div>
+      )}
+
+      {/* Units / Quantity tab */}
+      {tab === 'units' && (
+        <div className="space-y-4">
+          {product.isSerialized ? (
+            <>
+              <div className="flex items-center justify-between">
+                <p className="text-sm text-muted-foreground">{units.length} unit(s) on file</p>
+                {hasPermission('inventory.edit') && (
+                  <Dialog open={addUnitOpen} onOpenChange={setAddUnitOpen}>
+                    <DialogTrigger asChild>
+                      <Button size="sm"><Plus className="mr-2 h-4 w-4" />Add Unit</Button>
+                    </DialogTrigger>
+                    <DialogContent>
+                      <DialogHeader><DialogTitle>Add Unit</DialogTitle></DialogHeader>
+                      <InventoryUnitForm
+                        onSubmit={createUnitMutation.mutate}
+                        loading={createUnitMutation.isPending}
+                      />
+                    </DialogContent>
+                  </Dialog>
+                )}
+              </div>
+              <div className="rounded-md border">
+                <Table>
+                  <TableHeader>
+                    <TableRow>
+                      <TableHead>Serial #</TableHead>
+                      <TableHead>Condition</TableHead>
+                      <TableHead>Status</TableHead>
+                      <TableHead>Purchased</TableHead>
+                      <TableHead>Cost</TableHead>
+                      <TableHead>Notes</TableHead>
+                      {hasPermission('inventory.edit') && <TableHead className="w-10" />}
+                    </TableRow>
+                  </TableHeader>
+                  <TableBody>
+                    {units.length === 0 ? (
+                      <TableRow>
+                        <TableCell colSpan={7} className="text-center py-8 text-muted-foreground">
+                          No units yet — add the first unit above
+                        </TableCell>
+                      </TableRow>
+                    ) : (
+                      units.map((u) => (
+                        <TableRow key={u.id}>
+                          <TableCell className="font-mono text-sm">{u.serialNumber ?? '—'}</TableCell>
+                          <TableCell>
+                            <span className={cn('inline-flex items-center px-2 py-0.5 rounded text-xs font-medium', CONDITION_CLASSES[u.condition])}>
+                              {u.condition}
+                            </span>
+                          </TableCell>
+                          <TableCell>
+                            <span className={cn('inline-flex items-center px-2 py-0.5 rounded text-xs font-medium', STATUS_CLASSES[u.status])}>
+                              {STATUS_LABELS[u.status]}
+                            </span>
+                          </TableCell>
+                          <TableCell className="text-sm text-muted-foreground">
+                            {u.purchaseDate ? new Date(u.purchaseDate + 'T00:00:00').toLocaleDateString() : '—'}
+                          </TableCell>
+                          <TableCell className="text-sm">
+                            {u.purchaseCost ? `$${Number(u.purchaseCost).toFixed(2)}` : '—'}
+                          </TableCell>
+                          <TableCell className="text-sm text-muted-foreground max-w-[200px] truncate">
+                            {u.notes ?? '—'}
+                          </TableCell>
+                          {hasPermission('inventory.edit') && (
+                            <TableCell>
+                              <Button variant="ghost" size="sm" className="h-7 w-7 p-0" onClick={() => setEditUnit(u)}>
+                                <Pencil className="h-3 w-3" />
+                              </Button>
+                            </TableCell>
+                          )}
+                        </TableRow>
+                      ))
+                    )}
+                  </TableBody>
+                </Table>
+              </div>
+            </>
+          ) : (
+            <div className="max-w-xs space-y-4">
+              <p className="text-sm text-muted-foreground">
+                This product is not serialized — track quantity as a single number.
+              </p>
+              <div className="space-y-2">
+                <Label htmlFor="qty-edit">Quantity On Hand</Label>
+                <div className="flex gap-2">
+                  <Input
+                    id="qty-edit"
+                    type="number"
+                    min={0}
+                    defaultValue={product.qtyOnHand}
+                    onChange={(e) => setQtyEdit(e.target.value)}
+                    className="w-32"
+                  />
+                  <Button onClick={handleQtySave} disabled={updateMutation.isPending}>
+                    {updateMutation.isPending ? 'Saving...' : 'Save'}
+                  </Button>
+                </div>
+              </div>
+              {product.qtyReorderPoint !== null && (
+                <p className="text-xs text-muted-foreground">Reorder point: {product.qtyReorderPoint}</p>
+              )}
+            </div>
+          )}
+        </div>
+      )}
+
+      {/* Suppliers tab */}
+      {tab === 'suppliers' && (
+        <SuppliersTab
+          productId={productId}
+          linkedSuppliers={linkedSuppliers}
+          addOpen={addSupplierOpen}
+          setAddOpen={setAddSupplierOpen}
+          editTarget={editSupplier}
+          setEditTarget={setEditSupplier}
+          addMutation={addSupplierMutation}
+          updateMutation={updateSupplierMutation}
+          removeMutation={removeSupplierMutation}
+          canEdit={hasPermission('inventory.edit')}
+        />
+      )}
+
+      {/* Stock Receipts tab */}
+      {tab === 'stock-receipts' && (
+        <div className="space-y-4">
+          <div className="flex items-center justify-between">
+            <p className="text-sm text-muted-foreground">{stockReceiptRows.length} receipt(s) on record</p>
+            {hasPermission('inventory.edit') && (
+              <Dialog open={addReceiptOpen} onOpenChange={setAddReceiptOpen}>
+                <DialogTrigger asChild>
+                  <Button size="sm"><Plus className="h-4 w-4 mr-1" />Receive Stock</Button>
+                </DialogTrigger>
+                <DialogContent>
+                  <DialogHeader><DialogTitle>Receive Stock</DialogTitle></DialogHeader>
+                  <StockReceiptForm
+                    linkedSuppliers={linkedSuppliers}
+                    loading={createReceiptMutation.isPending}
+                    onSubmit={(data) => createReceiptMutation.mutate(data)}
+                  />
+                </DialogContent>
+              </Dialog>
+            )}
+          </div>
+          <div className="rounded-md border">
+            <Table>
+              <TableHeader>
+                <TableRow>
+                  <TableHead>Date</TableHead>
+                  <TableHead>Supplier</TableHead>
+                  <TableHead>Invoice #</TableHead>
+                  <TableHead className="text-right">Qty</TableHead>
+                  <TableHead className="text-right">Cost / Unit</TableHead>
+                  <TableHead className="text-right">Total Cost</TableHead>
+                </TableRow>
+              </TableHeader>
+              <TableBody>
+                {stockReceiptRows.length === 0 ? (
+                  <TableRow>
+                    <TableCell colSpan={6} className="text-center py-8 text-muted-foreground">
+                      No stock receipts yet
+                    </TableCell>
+                  </TableRow>
+                ) : (
+                  stockReceiptRows.map((r) => (
+                    <TableRow key={r.id}>
+                      <TableCell className="text-sm text-muted-foreground">
+                        {new Date(r.receivedDate + 'T12:00:00').toLocaleDateString(undefined, { year: 'numeric', month: 'short', day: 'numeric' })}
+                      </TableCell>
+                      <TableCell className="text-sm">{r.supplierName ?? <span className="text-muted-foreground">—</span>}</TableCell>
+                      <TableCell className="text-sm font-mono">{r.invoiceNumber ?? <span className="text-muted-foreground">—</span>}</TableCell>
+                      <TableCell className="text-sm text-right">{r.qty}</TableCell>
+                      <TableCell className="text-sm text-right">${Number(r.costPerUnit).toFixed(2)}</TableCell>
+                      <TableCell className="text-sm text-right font-medium">${Number(r.totalCost).toFixed(2)}</TableCell>
+                    </TableRow>
+                  ))
+                )}
+              </TableBody>
+            </Table>
+          </div>
+          {stockReceiptRows.length > 0 && (
+            <p className="text-xs text-muted-foreground text-right">
+              Total invested: ${stockReceiptRows.reduce((sum, r) => sum + Number(r.totalCost), 0).toFixed(2)}
+            </p>
+          )}
+        </div>
+      )}
+
+      {/* Price History tab */}
+      {tab === 'price-history' && (
+        <div className="space-y-4">
+          <p className="text-sm text-muted-foreground">{priceHistoryRows.length} price change(s) on record</p>
+          <div className="rounded-md border">
+            <Table>
+              <TableHeader>
+                <TableRow>
+                  <TableHead>Date</TableHead>
+                  <TableHead>Previous Price</TableHead>
+                  <TableHead>New Price</TableHead>
+                  <TableHead>Previous Min</TableHead>
+                  <TableHead>New Min</TableHead>
+                </TableRow>
+              </TableHeader>
+              <TableBody>
+                {priceHistoryRows.length === 0 ? (
+                  <TableRow>
+                    <TableCell colSpan={5} className="text-center py-8 text-muted-foreground">
+                      No price changes recorded yet
+                    </TableCell>
+                  </TableRow>
+                ) : (
+                  priceHistoryRows.map((h) => (
+                    <TableRow key={h.id}>
+                      <TableCell className="text-sm text-muted-foreground">
+                        {new Date(h.createdAt).toLocaleDateString(undefined, { year: 'numeric', month: 'short', day: 'numeric' })}
+                      </TableCell>
+                      <TableCell className="text-sm">
+                        {h.previousPrice ? `$${Number(h.previousPrice).toFixed(2)}` : '—'}
+                      </TableCell>
+                      <TableCell className="text-sm font-medium">
+                        ${Number(h.newPrice).toFixed(2)}
+                      </TableCell>
+                      <TableCell className="text-sm">
+                        {h.previousMinPrice ? `$${Number(h.previousMinPrice).toFixed(2)}` : '—'}
+                      </TableCell>
+                      <TableCell className="text-sm">
+                        {h.newMinPrice ? `$${Number(h.newMinPrice).toFixed(2)}` : '—'}
+                      </TableCell>
+                    </TableRow>
+                  ))
+                )}
+              </TableBody>
+            </Table>
+          </div>
+        </div>
+      )}
+
+      {/* Edit unit dialog */}
+      <Dialog open={!!editUnit} onOpenChange={(o) => !o && setEditUnit(null)}>
+        <DialogContent>
+          <DialogHeader><DialogTitle>Edit Unit</DialogTitle></DialogHeader>
+          {editUnit && (
+            <InventoryUnitForm
+              defaultValues={editUnit}
+              onSubmit={(data) => updateUnitMutation.mutate({ id: editUnit.id, data })}
+              loading={updateUnitMutation.isPending}
+            />
+          )}
+        </DialogContent>
+      </Dialog>
+    </div>
+  )
+}
+
+// ── Suppliers tab ─────────────────────────────────────────────────────────────
+
+function SuppliersTab({
+  productId,
+  linkedSuppliers,
+  addOpen, setAddOpen,
+  editTarget, setEditTarget,
+  addMutation, updateMutation, removeMutation,
+  canEdit,
+}: {
+  productId: string
+  linkedSuppliers: ProductSupplier[]
+  addOpen: boolean
+  setAddOpen: (v: boolean) => void
+  editTarget: ProductSupplier | null
+  setEditTarget: (v: ProductSupplier | null) => void
+  addMutation: any
+  updateMutation: any
+  removeMutation: any
+  canEdit: boolean
+}) {
+  const { data: allSuppliersData } = useQuery(supplierListOptions({ page: 1, limit: 500, order: 'asc', sort: 'name' } as any))
+  const allSuppliers = allSuppliersData?.data ?? []
+  const linkedIds = new Set(linkedSuppliers.map((s) => s.supplierId))
+  const availableSuppliers = allSuppliers.filter((s) => !linkedIds.has(s.id))
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-between">
+        <p className="text-sm text-muted-foreground">{linkedSuppliers.length} supplier(s) linked</p>
+        {canEdit && availableSuppliers.length > 0 && (
+          <Dialog open={addOpen} onOpenChange={setAddOpen}>
+            <DialogTrigger asChild>
+              <Button size="sm"><Plus className="mr-2 h-4 w-4" />Link Supplier</Button>
+            </DialogTrigger>
+            <DialogContent>
+              <DialogHeader><DialogTitle>Link Supplier</DialogTitle></DialogHeader>
+              <SupplierLinkForm
+                suppliers={availableSuppliers}
+                onSubmit={addMutation.mutate}
+                loading={addMutation.isPending}
+                hasExisting={linkedSuppliers.length > 0}
+              />
+            </DialogContent>
+          </Dialog>
+        )}
+      </div>
+
+      <div className="rounded-md border">
+        <Table>
+          <TableHeader>
+            <TableRow>
+              <TableHead>Supplier</TableHead>
+              <TableHead>Their SKU</TableHead>
+              <TableHead>Contact</TableHead>
+              <TableHead>Terms</TableHead>
+              <TableHead>Preferred</TableHead>
+              {canEdit && <TableHead className="w-10" />}
+            </TableRow>
+          </TableHeader>
+          <TableBody>
+            {linkedSuppliers.length === 0 ? (
+              <TableRow>
+                <TableCell colSpan={6} className="text-center py-8 text-muted-foreground">
+                  No suppliers linked — add the first supplier above
+                </TableCell>
+              </TableRow>
+            ) : (
+              linkedSuppliers.map((s) => (
+                <TableRow key={s.id}>
+                  <TableCell>
+                    <div>
+                      <p className="font-medium text-sm">{s.supplierName}</p>
+                      {s.supplierEmail && (
+                        <a href={`mailto:${s.supplierEmail}`} className="text-xs text-muted-foreground hover:underline" onClick={(e) => e.stopPropagation()}>
+                          {s.supplierEmail}
+                        </a>
+                      )}
+                    </div>
+                  </TableCell>
+                  <TableCell className="font-mono text-sm">{s.supplierSku ?? <span className="text-muted-foreground">—</span>}</TableCell>
+                  <TableCell className="text-sm text-muted-foreground">{s.supplierContactName ?? '—'}</TableCell>
+                  <TableCell className="text-sm text-muted-foreground">{s.supplierPaymentTerms ?? '—'}</TableCell>
+                  <TableCell>
+                    {s.isPreferred && (
+                      <span className="inline-flex items-center gap-1 text-xs font-medium text-amber-700 bg-amber-50 border border-amber-200 px-2 py-0.5 rounded">
+                        <Star className="h-3 w-3 fill-amber-500 text-amber-500" />Preferred
+                      </span>
+                    )}
+                  </TableCell>
+                  {canEdit && (
+                    <TableCell>
+                      <Button variant="ghost" size="sm" className="h-7 w-7 p-0" onClick={() => setEditTarget(s)}>
+                        <Pencil className="h-3 w-3" />
+                      </Button>
+                    </TableCell>
+                  )}
+                </TableRow>
+              ))
+            )}
+          </TableBody>
+        </Table>
+      </div>
+
+      {/* Edit/remove supplier link dialog */}
+      <Dialog open={!!editTarget} onOpenChange={(o) => !o && setEditTarget(null)}>
+        <DialogContent>
+          <DialogHeader><DialogTitle>Edit Supplier Link</DialogTitle></DialogHeader>
+          {editTarget && (
+            <div className="space-y-4">
+              <p className="text-sm font-medium">{editTarget.supplierName}</p>
+              <SupplierLinkEditForm
+                defaultValues={editTarget}
+                onSubmit={(data) => updateMutation.mutate({ id: editTarget.id, data })}
+                loading={updateMutation.isPending}
+              />
+              <div className="border-t pt-4">
+                <AlertDialog>
+                  <AlertDialogTrigger asChild>
+                    <Button variant="destructive" size="sm" disabled={removeMutation.isPending}>
+                      <Trash2 className="h-4 w-4 mr-2" />Remove Supplier
+                    </Button>
+                  </AlertDialogTrigger>
+                  <AlertDialogContent>
+                    <AlertDialogHeader>
+                      <AlertDialogTitle>Remove supplier?</AlertDialogTitle>
+                      <AlertDialogDescription>
+                        This will unlink {editTarget.supplierName} from this product. You can re-add it later.
+                      </AlertDialogDescription>
+                    </AlertDialogHeader>
+                    <AlertDialogFooter>
+                      <AlertDialogCancel>Cancel</AlertDialogCancel>
+                      <AlertDialogAction onClick={() => removeMutation.mutate(editTarget.id)}>Remove</AlertDialogAction>
+                    </AlertDialogFooter>
+                  </AlertDialogContent>
+                </AlertDialog>
+              </div>
+            </div>
+          )}
+        </DialogContent>
+      </Dialog>
+    </div>
+  )
+}
+
+function SupplierLinkForm({
+  suppliers, onSubmit, loading, hasExisting,
+}: {
+  suppliers: { id: string; name: string }[]
+  onSubmit: (data: Record<string, unknown>) => void
+  loading: boolean
+  hasExisting: boolean
+}) {
+  const [supplierId, setSupplierId] = useState('')
+  const [supplierSku, setSupplierSku] = useState('')
+  const [isPreferred, setIsPreferred] = useState(!hasExisting)
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    if (!supplierId) return
+    onSubmit({ supplierId, supplierSku: supplierSku || undefined, isPreferred })
+  }
+
+  return (
+    <form onSubmit={handleSubmit} className="space-y-4">
+      <div className="space-y-2">
+        <Label>Supplier</Label>
+        <Select value={supplierId} onValueChange={setSupplierId}>
+          <SelectTrigger><SelectValue placeholder="Select supplier…" /></SelectTrigger>
+          <SelectContent>
+            {suppliers.map((s) => <SelectItem key={s.id} value={s.id}>{s.name}</SelectItem>)}
+          </SelectContent>
+        </Select>
+      </div>
+      <div className="space-y-2">
+        <Label htmlFor="supplier-sku">Their SKU / Part #</Label>
+        <Input id="supplier-sku" value={supplierSku} onChange={(e) => setSupplierSku(e.target.value)} placeholder="e.g. VLN-44-EA" />
+      </div>
+      <div className="flex items-center gap-2">
+        <Checkbox id="is-preferred" checked={isPreferred} onCheckedChange={(v: boolean | 'indeterminate') => setIsPreferred(!!v)} />
+        <Label htmlFor="is-preferred">Preferred supplier for this product</Label>
+      </div>
+      <Button type="submit" disabled={!supplierId || loading}>{loading ? 'Linking…' : 'Link Supplier'}</Button>
+    </form>
+  )
+}
+
+function StockReceiptForm({
+  linkedSuppliers, onSubmit, loading,
+}: {
+  linkedSuppliers: ProductSupplier[]
+  onSubmit: (data: Record<string, unknown>) => void
+  loading: boolean
+}) {
+  const today = new Date().toISOString().split('T')[0]
+  const [supplierId, setSupplierId] = useState('')
+  const [qty, setQty] = useState('1')
+  const [costPerUnit, setCostPerUnit] = useState('')
+  const [receivedDate, setReceivedDate] = useState(today)
+  const [invoiceNumber, setInvoiceNumber] = useState('')
+  const [notes, setNotes] = useState('')
+
+  const total = (parseFloat(qty) || 0) * (parseFloat(costPerUnit) || 0)
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    onSubmit({
+      supplierId: supplierId || undefined,
+      qty: parseInt(qty, 10),
+      costPerUnit: parseFloat(costPerUnit),
+      receivedDate,
+      invoiceNumber: invoiceNumber || undefined,
+      notes: notes || undefined,
+    })
+  }
+
+  return (
+    <form onSubmit={handleSubmit} className="space-y-4">
+      <div className="space-y-2">
+        <Label>Supplier</Label>
+        <Select value={supplierId || 'none'} onValueChange={(v) => setSupplierId(v === 'none' ? '' : v)}>
+          <SelectTrigger><SelectValue placeholder="Select supplier…" /></SelectTrigger>
+          <SelectContent>
+            <SelectItem value="none">No supplier</SelectItem>
+            {linkedSuppliers.map((s) => (
+              <SelectItem key={s.supplierId} value={s.supplierId}>{s.supplierName}</SelectItem>
+            ))}
+          </SelectContent>
+        </Select>
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="rcpt-qty">Qty Received *</Label>
+          <Input id="rcpt-qty" type="number" min="1" value={qty} onChange={(e) => setQty(e.target.value)} required />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="rcpt-cost">Cost / Unit *</Label>
+          <Input id="rcpt-cost" type="number" step="0.01" min="0" value={costPerUnit} onChange={(e) => setCostPerUnit(e.target.value)} placeholder="0.00" required />
+        </div>
+      </div>
+      {costPerUnit && qty && (
+        <p className="text-sm text-muted-foreground">Total cost: <span className="font-medium text-foreground">${total.toFixed(2)}</span></p>
+      )}
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="rcpt-date">Received Date *</Label>
+          <Input id="rcpt-date" type="date" value={receivedDate} onChange={(e) => setReceivedDate(e.target.value)} required />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="rcpt-inv">Invoice #</Label>
+          <Input id="rcpt-inv" value={invoiceNumber} onChange={(e) => setInvoiceNumber(e.target.value)} placeholder="INV-001" />
+        </div>
+      </div>
+      <div className="space-y-2">
+        <Label htmlFor="rcpt-notes">Notes</Label>
+        <Input id="rcpt-notes" value={notes} onChange={(e) => setNotes(e.target.value)} placeholder="Optional notes" />
+      </div>
+      <Button type="submit" disabled={loading || !costPerUnit || !qty} className="w-full">
+        {loading ? 'Recording…' : 'Record Receipt'}
+      </Button>
+    </form>
+  )
+}
+
+function SupplierLinkEditForm({
+  defaultValues, onSubmit, loading,
+}: {
+  defaultValues: ProductSupplier
+  onSubmit: (data: Record<string, unknown>) => void
+  loading: boolean
+}) {
+  const [supplierSku, setSupplierSku] = useState(defaultValues.supplierSku ?? '')
+  const [isPreferred, setIsPreferred] = useState(defaultValues.isPreferred)
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    onSubmit({ supplierSku: supplierSku || undefined, isPreferred })
+  }
+
+  return (
+    <form onSubmit={handleSubmit} className="space-y-4">
+      <div className="space-y-2">
+        <Label htmlFor="edit-sku">Their SKU / Part #</Label>
+        <Input id="edit-sku" value={supplierSku} onChange={(e) => setSupplierSku(e.target.value)} placeholder="e.g. VLN-44-EA" />
+      </div>
+      <div className="flex items-center gap-2">
+        <Checkbox id="edit-preferred" checked={isPreferred} onCheckedChange={(v: boolean | 'indeterminate') => setIsPreferred(!!v)} />
+        <Label htmlFor="edit-preferred">Preferred supplier for this product</Label>
+      </div>
+      <Button type="submit" disabled={loading}>{loading ? 'Saving…' : 'Save Changes'}</Button>
+    </form>
+  )
+}
diff --git a/packages/admin/src/routes/_authenticated/inventory/categories.tsx b/packages/admin/src/routes/_authenticated/inventory/categories.tsx
new file mode 100644
index 0000000..65802e0
--- /dev/null
+++ b/packages/admin/src/routes/_authenticated/inventory/categories.tsx
@@ -0,0 +1,170 @@
+import { useState } from 'react'
+import { createFileRoute } from '@tanstack/react-router'
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { categoryListOptions, categoryMutations, categoryKeys } from '@/api/inventory'
+import { CategoryForm } from '@/components/inventory/category-form'
+import { usePagination } from '@/hooks/use-pagination'
+import { DataTable, type Column } from '@/components/shared/data-table'
+import { Badge } from '@/components/ui/badge'
+import { Button } from '@/components/ui/button'
+import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogTrigger } from '@/components/ui/dialog'
+import { Input } from '@/components/ui/input'
+import { Search, Plus } from 'lucide-react'
+import { toast } from 'sonner'
+import { useAuthStore } from '@/stores/auth.store'
+import type { Category } from '@/types/inventory'
+
+export const Route = createFileRoute('/_authenticated/inventory/categories')({
+  validateSearch: (search: Record<string, unknown>) => ({
+    page: Number(search.page) || 1,
+    limit: Number(search.limit) || 25,
+    q: (search.q as string) || undefined,
+    sort: (search.sort as string) || undefined,
+    order: (search.order as 'asc' | 'desc') || 'asc',
+  }),
+  component: CategoriesPage,
+})
+
+function CategoriesPage() {
+  const queryClient = useQueryClient()
+  const hasPermission = useAuthStore((s) => s.hasPermission)
+  const { params, setPage, setSearch, setSort } = usePagination()
+  const [searchInput, setSearchInput] = useState(params.q ?? '')
+  const [createOpen, setCreateOpen] = useState(false)
+  const [editTarget, setEditTarget] = useState<Category | null>(null)
+
+  const { data, isLoading } = useQuery(categoryListOptions(params))
+
+  const createMutation = useMutation({
+    mutationFn: categoryMutations.create,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: categoryKeys.all })
+      toast.success('Category created')
+      setCreateOpen(false)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const updateMutation = useMutation({
+    mutationFn: ({ id, data }: { id: string; data: Record<string, unknown> }) =>
+      categoryMutations.update(id, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: categoryKeys.all })
+      toast.success('Category updated')
+      setEditTarget(null)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const deleteMutation = useMutation({
+    mutationFn: categoryMutations.delete,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: categoryKeys.all })
+      toast.success('Category deleted')
+      setEditTarget(null)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  function handleSearchSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    setSearch(searchInput)
+  }
+
+  const columns: Column<Category>[] = [
+    {
+      key: 'name',
+      header: 'Name',
+      sortable: true,
+      render: (c) => <span className="font-medium">{c.name}</span>,
+    },
+    {
+      key: 'sort_order',
+      header: 'Order',
+      sortable: true,
+      render: (c) => <span className="text-muted-foreground text-sm">{c.sortOrder}</span>,
+    },
+    {
+      key: 'is_active',
+      header: 'Status',
+      sortable: true,
+      render: (c) => c.isActive
+        ? <Badge>Active</Badge>
+        : <Badge variant="secondary">Inactive</Badge>,
+    },
+    {
+      key: 'actions',
+      header: '',
+      render: (c) => hasPermission('inventory.edit') ? (
+        <Button variant="ghost" size="sm" onClick={(e) => { e.stopPropagation(); setEditTarget(c) }}>
+          Edit
+        </Button>
+      ) : null,
+    },
+  ]
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <h1 className="text-2xl font-bold">Categories</h1>
+        {hasPermission('inventory.edit') && (
+          <Dialog open={createOpen} onOpenChange={setCreateOpen}>
+            <DialogTrigger asChild>
+              <Button><Plus className="mr-2 h-4 w-4" />New Category</Button>
+            </DialogTrigger>
+            <DialogContent>
+              <DialogHeader><DialogTitle>New Category</DialogTitle></DialogHeader>
+              <CategoryForm
+                onSubmit={createMutation.mutate}
+                loading={createMutation.isPending}
+              />
+            </DialogContent>
+          </Dialog>
+        )}
+      </div>
+
+      <form onSubmit={handleSearchSubmit} className="flex gap-2 max-w-sm">
+        <div className="relative flex-1">
+          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
+          <Input
+            placeholder="Search categories..."
+            value={searchInput}
+            onChange={(e) => setSearchInput(e.target.value)}
+            className="pl-9"
+          />
+        </div>
+        <Button type="submit" variant="secondary">Search</Button>
+      </form>
+
+      <DataTable
+        columns={columns}
+        data={data?.data ?? []}
+        loading={isLoading}
+        page={params.page}
+        totalPages={data?.pagination.totalPages ?? 1}
+        total={data?.pagination.total ?? 0}
+        sort={params.sort}
+        order={params.order}
+        onPageChange={setPage}
+        onSort={setSort}
+        onRowClick={hasPermission('inventory.edit') ? setEditTarget : undefined}
+      />
+
+      {/* Edit dialog */}
+      <Dialog open={!!editTarget} onOpenChange={(o) => !o && setEditTarget(null)}>
+        <DialogContent>
+          <DialogHeader><DialogTitle>Edit Category</DialogTitle></DialogHeader>
+          {editTarget && (
+            <CategoryForm
+              defaultValues={editTarget}
+              onSubmit={(data) => updateMutation.mutate({ id: editTarget.id, data })}
+              loading={updateMutation.isPending}
+              onDelete={hasPermission('inventory.admin') ? () => deleteMutation.mutate(editTarget.id) : undefined}
+              deleteLoading={deleteMutation.isPending}
+            />
+          )}
+        </DialogContent>
+      </Dialog>
+    </div>
+  )
+}
diff --git a/packages/admin/src/routes/_authenticated/inventory/index.tsx b/packages/admin/src/routes/_authenticated/inventory/index.tsx
new file mode 100644
index 0000000..3ebbb7a
--- /dev/null
+++ b/packages/admin/src/routes/_authenticated/inventory/index.tsx
@@ -0,0 +1,253 @@
+import { useState } from 'react'
+import { createFileRoute, useNavigate } from '@tanstack/react-router'
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { productListOptions, productMutations, productKeys, categoryAllOptions } from '@/api/inventory'
+import { ProductForm } from '@/components/inventory/product-form'
+import { usePagination } from '@/hooks/use-pagination'
+import { DataTable, type Column } from '@/components/shared/data-table'
+import { Badge } from '@/components/ui/badge'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
+import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogTrigger } from '@/components/ui/dialog'
+import { Search, Plus } from 'lucide-react'
+import { toast } from 'sonner'
+import { useAuthStore } from '@/stores/auth.store'
+import type { Product } from '@/types/inventory'
+
+export const Route = createFileRoute('/_authenticated/inventory/')({
+  validateSearch: (search: Record<string, unknown>) => ({
+    page: Number(search.page) || 1,
+    limit: Number(search.limit) || 25,
+    q: (search.q as string) || undefined,
+    sort: (search.sort as string) || undefined,
+    order: (search.order as 'asc' | 'desc') || 'asc',
+    categoryId: (search.categoryId as string) || undefined,
+    isActive: (search.isActive as string) || undefined,
+    type: (search.type as string) || undefined,
+    lowStock: (search.lowStock as string) || undefined,
+  }),
+  component: InventoryPage,
+})
+
+function qtyBadge(qty: number, reorderPoint: number | null) {
+  if (qty === 0) return <Badge variant="destructive">{qty}</Badge>
+  if (reorderPoint !== null && qty <= reorderPoint)
+    return <Badge variant="secondary" className="bg-amber-100 text-amber-800 border-amber-300">{qty} Low</Badge>
+  return <span className="text-sm">{qty}</span>
+}
+
+function InventoryPage() {
+  const navigate = useNavigate()
+  const queryClient = useQueryClient()
+  const hasPermission = useAuthStore((s) => s.hasPermission)
+  const { params, setPage, setSearch, setSort } = usePagination()
+  const [searchInput, setSearchInput] = useState(params.q ?? '')
+  const [createOpen, setCreateOpen] = useState(false)
+
+  const search = Route.useSearch()
+  const [categoryFilter, setCategoryFilter] = useState(search.categoryId ?? '')
+  const [activeFilter, setActiveFilter] = useState(search.isActive ?? '')
+  const [typeFilter, setTypeFilter] = useState(search.type ?? '')
+  const [lowStockFilter, setLowStockFilter] = useState(search.lowStock === 'true')
+
+  const { data: categoriesData } = useQuery(categoryAllOptions())
+  const categories = categoriesData?.data ?? []
+  const categoryMap = new Map(categories.map((c) => [c.id, c.name]))
+
+  const queryParams: Record<string, unknown> = { ...params }
+  if (categoryFilter) queryParams.categoryId = categoryFilter
+  if (activeFilter) queryParams.isActive = activeFilter === 'true'
+  if (typeFilter === 'serialized') queryParams.isSerialized = true
+  if (typeFilter === 'rental') queryParams.isRental = true
+  if (typeFilter === 'repair') queryParams.isDualUseRepair = true
+  if (lowStockFilter) queryParams.lowStock = true
+
+  const { data, isLoading } = useQuery(productListOptions(queryParams))
+
+  const createMutation = useMutation({
+    mutationFn: productMutations.create,
+    onSuccess: (product) => {
+      queryClient.invalidateQueries({ queryKey: productKeys.all })
+      toast.success('Product created')
+      setCreateOpen(false)
+      navigate({ to: '/inventory/$productId', params: { productId: product.id }, search: {} as any })
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  function handleSearchSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    setSearch(searchInput)
+  }
+
+  function handleCategoryChange(v: string) {
+    setCategoryFilter(v === 'all' ? '' : v)
+    navigate({ to: '/inventory', search: { ...search, categoryId: v === 'all' ? undefined : v, page: 1 } as any })
+  }
+
+  function handleActiveChange(v: string) {
+    setActiveFilter(v === 'all' ? '' : v)
+    navigate({ to: '/inventory', search: { ...search, isActive: v === 'all' ? undefined : v, page: 1 } as any })
+  }
+
+  function handleTypeChange(v: string) {
+    setTypeFilter(v === 'all' ? '' : v)
+    navigate({ to: '/inventory', search: { ...search, type: v === 'all' ? undefined : v, page: 1 } as any })
+  }
+
+  function handleLowStockChange(v: string) {
+    const on = v === 'true'
+    setLowStockFilter(on)
+    navigate({ to: '/inventory', search: { ...search, lowStock: on ? 'true' : undefined, page: 1 } as any })
+  }
+
+  const columns: Column<Product>[] = [
+    {
+      key: 'name',
+      header: 'Name',
+      sortable: true,
+      render: (p) => <span className="font-medium">{p.name}</span>,
+    },
+    {
+      key: 'sku',
+      header: 'SKU',
+      sortable: true,
+      render: (p) => p.sku
+        ? <span className="font-mono text-sm">{p.sku}</span>
+        : <span className="text-muted-foreground">—</span>,
+    },
+    {
+      key: 'brand',
+      header: 'Brand',
+      sortable: true,
+      render: (p) => p.brand ?? <span className="text-muted-foreground">—</span>,
+    },
+    {
+      key: 'category',
+      header: 'Category',
+      render: (p) => p.categoryId
+        ? (categoryMap.get(p.categoryId) ?? <span className="text-muted-foreground">—</span>)
+        : <span className="text-muted-foreground">—</span>,
+    },
+    {
+      key: 'price',
+      header: 'Price',
+      sortable: true,
+      render: (p) => p.price ? `$${Number(p.price).toFixed(2)}` : <span className="text-muted-foreground">—</span>,
+    },
+    {
+      key: 'qty_on_hand',
+      header: 'Qty',
+      sortable: true,
+      render: (p) => qtyBadge(p.qtyOnHand, p.qtyReorderPoint),
+    },
+    {
+      key: 'flags',
+      header: 'Type',
+      render: (p) => (
+        <div className="flex gap-1">
+          {p.isSerialized && <Badge variant="outline" className="text-xs">Serial</Badge>}
+          {p.isRental && <Badge variant="outline" className="text-xs">Rental</Badge>}
+          {p.isDualUseRepair && <Badge variant="outline" className="text-xs">Repair</Badge>}
+        </div>
+      ),
+    },
+    {
+      key: 'is_active',
+      header: 'Status',
+      sortable: true,
+      render: (p) => p.isActive
+        ? <Badge>Active</Badge>
+        : <Badge variant="secondary">Inactive</Badge>,
+    },
+  ]
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <h1 className="text-2xl font-bold">Products</h1>
+        {hasPermission('inventory.edit') && (
+          <Dialog open={createOpen} onOpenChange={setCreateOpen}>
+            <DialogTrigger asChild>
+              <Button><Plus className="mr-2 h-4 w-4" />New Product</Button>
+            </DialogTrigger>
+            <DialogContent className="max-w-xl max-h-[90vh] overflow-y-auto">
+              <DialogHeader><DialogTitle>New Product</DialogTitle></DialogHeader>
+              <ProductForm onSubmit={createMutation.mutate} loading={createMutation.isPending} />
+            </DialogContent>
+          </Dialog>
+        )}
+      </div>
+
+      <div className="flex gap-3 flex-wrap">
+        <form onSubmit={handleSearchSubmit} className="flex gap-2">
+          <div className="relative">
+            <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
+            <Input
+              placeholder="Search products..."
+              value={searchInput}
+              onChange={(e) => setSearchInput(e.target.value)}
+              className="pl-9 w-64"
+            />
+          </div>
+          <Button type="submit" variant="secondary">Search</Button>
+        </form>
+        <Select value={categoryFilter || 'all'} onValueChange={handleCategoryChange}>
+          <SelectTrigger className="w-44">
+            <SelectValue placeholder="All Categories" />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="all">All Categories</SelectItem>
+            {categories.filter((c) => c.isActive).map((c) => (
+              <SelectItem key={c.id} value={c.id}>{c.name}</SelectItem>
+            ))}
+          </SelectContent>
+        </Select>
+        <Select value={typeFilter || 'all'} onValueChange={handleTypeChange}>
+          <SelectTrigger className="w-36">
+            <SelectValue placeholder="All Types" />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="all">All Types</SelectItem>
+            <SelectItem value="serialized">Serialized</SelectItem>
+            <SelectItem value="rental">Rental</SelectItem>
+            <SelectItem value="repair">Repair Parts</SelectItem>
+          </SelectContent>
+        </Select>
+        <Select value={lowStockFilter ? 'true' : 'all'} onValueChange={handleLowStockChange}>
+          <SelectTrigger className="w-36">
+            <SelectValue placeholder="All Stock" />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="all">All Stock</SelectItem>
+            <SelectItem value="true">Low / Out of Stock</SelectItem>
+          </SelectContent>
+        </Select>
+        <Select value={activeFilter || 'all'} onValueChange={handleActiveChange}>
+          <SelectTrigger className="w-32">
+            <SelectValue placeholder="Active" />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value="all">Active</SelectItem>
+            <SelectItem value="false">Inactive</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+
+      <DataTable
+        columns={columns}
+        data={data?.data ?? []}
+        loading={isLoading}
+        page={params.page}
+        totalPages={data?.pagination.totalPages ?? 1}
+        total={data?.pagination.total ?? 0}
+        sort={params.sort}
+        order={params.order}
+        onPageChange={setPage}
+        onSort={setSort}
+        onRowClick={(p) => navigate({ to: '/inventory/$productId', params: { productId: p.id }, search: {} as any })}
+      />
+    </div>
+  )
+}
diff --git a/packages/admin/src/routes/_authenticated/inventory/suppliers/index.tsx b/packages/admin/src/routes/_authenticated/inventory/suppliers/index.tsx
new file mode 100644
index 0000000..5d05eee
--- /dev/null
+++ b/packages/admin/src/routes/_authenticated/inventory/suppliers/index.tsx
@@ -0,0 +1,185 @@
+import { useState } from 'react'
+import { createFileRoute } from '@tanstack/react-router'
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { supplierListOptions, supplierMutations, supplierKeys } from '@/api/inventory'
+import { SupplierForm } from '@/components/inventory/supplier-form'
+import { usePagination } from '@/hooks/use-pagination'
+import { DataTable, type Column } from '@/components/shared/data-table'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogTrigger } from '@/components/ui/dialog'
+import { Search, Plus } from 'lucide-react'
+import { toast } from 'sonner'
+import { useAuthStore } from '@/stores/auth.store'
+import type { Supplier } from '@/types/inventory'
+
+export const Route = createFileRoute('/_authenticated/inventory/suppliers/')({
+  validateSearch: (search: Record<string, unknown>) => ({
+    page: Number(search.page) || 1,
+    limit: Number(search.limit) || 25,
+    q: (search.q as string) || undefined,
+    sort: (search.sort as string) || undefined,
+    order: (search.order as 'asc' | 'desc') || 'asc',
+  }),
+  component: SuppliersPage,
+})
+
+function SuppliersPage() {
+  const queryClient = useQueryClient()
+  const hasPermission = useAuthStore((s) => s.hasPermission)
+  const { params, setPage, setSearch, setSort } = usePagination()
+  const [searchInput, setSearchInput] = useState(params.q ?? '')
+  const [createOpen, setCreateOpen] = useState(false)
+  const [editTarget, setEditTarget] = useState<Supplier | null>(null)
+
+  const { data, isLoading } = useQuery(supplierListOptions(params))
+
+  const createMutation = useMutation({
+    mutationFn: supplierMutations.create,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: supplierKeys.all })
+      toast.success('Supplier created')
+      setCreateOpen(false)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const updateMutation = useMutation({
+    mutationFn: ({ id, data }: { id: string; data: Record<string, unknown> }) =>
+      supplierMutations.update(id, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: supplierKeys.all })
+      toast.success('Supplier updated')
+      setEditTarget(null)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  const deleteMutation = useMutation({
+    mutationFn: supplierMutations.delete,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: supplierKeys.all })
+      toast.success('Supplier deleted')
+      setEditTarget(null)
+    },
+    onError: (err) => toast.error(err.message),
+  })
+
+  function handleSearchSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    setSearch(searchInput)
+  }
+
+  const columns: Column<Supplier>[] = [
+    {
+      key: 'name',
+      header: 'Name',
+      sortable: true,
+      render: (s) => <span className="font-medium">{s.name}</span>,
+    },
+    {
+      key: 'contact_name',
+      header: 'Contact',
+      render: (s) => s.contactName ?? <span className="text-muted-foreground">—</span>,
+    },
+    {
+      key: 'email',
+      header: 'Email',
+      sortable: true,
+      render: (s) => s.email
+        ? <a href={`mailto:${s.email}`} className="hover:underline" onClick={(e) => e.stopPropagation()}>{s.email}</a>
+        : <span className="text-muted-foreground">—</span>,
+    },
+    {
+      key: 'phone',
+      header: 'Phone',
+      render: (s) => s.phone ?? <span className="text-muted-foreground">—</span>,
+    },
+    {
+      key: 'account_number',
+      header: 'Account #',
+      render: (s) => s.accountNumber
+        ? <span className="font-mono text-sm">{s.accountNumber}</span>
+        : <span className="text-muted-foreground">—</span>,
+    },
+    {
+      key: 'payment_terms',
+      header: 'Terms',
+      render: (s) => s.paymentTerms ?? <span className="text-muted-foreground">—</span>,
+    },
+    {
+      key: 'actions',
+      header: '',
+      render: (s) => hasPermission('inventory.edit') ? (
+        <Button variant="ghost" size="sm" onClick={(e) => { e.stopPropagation(); setEditTarget(s) }}>
+          Edit
+        </Button>
+      ) : null,
+    },
+  ]
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <h1 className="text-2xl font-bold">Suppliers</h1>
+        {hasPermission('inventory.edit') && (
+          <Dialog open={createOpen} onOpenChange={setCreateOpen}>
+            <DialogTrigger asChild>
+              <Button><Plus className="mr-2 h-4 w-4" />New Supplier</Button>
+            </DialogTrigger>
+            <DialogContent>
+              <DialogHeader><DialogTitle>New Supplier</DialogTitle></DialogHeader>
+              <SupplierForm
+                onSubmit={supplierMutations.create.bind(null) as any}
+                loading={createMutation.isPending}
+              />
+            </DialogContent>
+          </Dialog>
+        )}
+      </div>
+
+      <form onSubmit={handleSearchSubmit} className="flex gap-2 max-w-sm">
+        <div className="relative flex-1">
+          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
+          <Input
+            placeholder="Search suppliers..."
+            value={searchInput}
+            onChange={(e) => setSearchInput(e.target.value)}
+            className="pl-9"
+          />
+        </div>
+        <Button type="submit" variant="secondary">Search</Button>
+      </form>
+
+      <DataTable
+        columns={columns}
+        data={data?.data ?? []}
+        loading={isLoading}
+        page={params.page}
+        totalPages={data?.pagination.totalPages ?? 1}
+        total={data?.pagination.total ?? 0}
+        sort={params.sort}
+        order={params.order}
+        onPageChange={setPage}
+        onSort={setSort}
+        onRowClick={hasPermission('inventory.edit') ? setEditTarget : undefined}
+      />
+
+      {/* Edit dialog */}
+      <Dialog open={!!editTarget} onOpenChange={(o) => !o && setEditTarget(null)}>
+        <DialogContent>
+          <DialogHeader><DialogTitle>Edit Supplier</DialogTitle></DialogHeader>
+          {editTarget && (
+            <SupplierForm
+              defaultValues={editTarget}
+              onSubmit={(data) => updateMutation.mutate({ id: editTarget.id, data })}
+              loading={updateMutation.isPending}
+              onDelete={hasPermission('inventory.admin') ? () => deleteMutation.mutate(editTarget.id) : undefined}
+              deleteLoading={deleteMutation.isPending}
+            />
+          )}
+        </DialogContent>
+      </Dialog>
+    </div>
+  )
+}
diff --git a/packages/admin/src/types/inventory.ts b/packages/admin/src/types/inventory.ts
new file mode 100644
index 0000000..9311946
--- /dev/null
+++ b/packages/admin/src/types/inventory.ts
@@ -0,0 +1,108 @@
+export type UnitCondition = 'new' | 'excellent' | 'good' | 'fair' | 'poor'
+export type UnitStatus =
+  | 'available'
+  | 'sold'
+  | 'rented'
+  | 'on_trial'
+  | 'in_repair'
+  | 'layaway'
+  | 'lost'
+  | 'retired'
+
+export interface Category {
+  id: string
+  name: string
+  parentId: string | null
+  sortOrder: number
+  isActive: boolean
+  createdAt: string
+  updatedAt: string
+}
+
+export interface Supplier {
+  id: string
+  name: string
+  contactName: string | null
+  email: string | null
+  phone: string | null
+  website: string | null
+  accountNumber: string | null
+  paymentTerms: string | null
+  createdAt: string
+  updatedAt: string
+}
+
+export interface Product {
+  id: string
+  name: string
+  sku: string | null
+  upc: string | null
+  brand: string | null
+  model: string | null
+  description: string | null
+  categoryId: string | null
+  isSerialized: boolean
+  isRental: boolean
+  isDualUseRepair: boolean
+  price: string | null
+  minPrice: string | null
+  rentalRateMonthly: string | null
+  qtyOnHand: number
+  qtyReorderPoint: number | null
+  isActive: boolean
+  createdAt: string
+  updatedAt: string
+}
+
+export interface InventoryUnit {
+  id: string
+  productId: string
+  serialNumber: string | null
+  condition: UnitCondition
+  status: UnitStatus
+  purchaseDate: string | null
+  purchaseCost: string | null
+  notes: string | null
+  createdAt: string
+}
+
+export interface ProductSupplier {
+  id: string
+  productId: string
+  supplierId: string
+  supplierSku: string | null
+  isPreferred: boolean
+  createdAt: string
+  supplierName: string
+  supplierContactName: string | null
+  supplierEmail: string | null
+  supplierPhone: string | null
+  supplierAccountNumber: string | null
+  supplierPaymentTerms: string | null
+}
+
+export interface StockReceipt {
+  id: string
+  productId: string
+  supplierId: string | null
+  inventoryUnitId: string | null
+  qty: number
+  costPerUnit: string
+  totalCost: string
+  receivedDate: string
+  invoiceNumber: string | null
+  notes: string | null
+  createdAt: string
+  supplierName: string | null
+}
+
+export interface PriceHistory {
+  id: string
+  productId: string
+  previousPrice: string | null
+  newPrice: string
+  previousMinPrice: string | null
+  newMinPrice: string | null
+  createdAt: string
+  changedBy: string | null
+}
diff --git a/packages/backend/api-tests/suites/inventory.ts b/packages/backend/api-tests/suites/inventory.ts
new file mode 100644
index 0000000..dea5558
--- /dev/null
+++ b/packages/backend/api-tests/suites/inventory.ts
@@ -0,0 +1,364 @@
+import { suite } from '../lib/context.js'
+
+suite('Inventory', { tags: ['inventory'] }, (t) => {
+  // ─── Categories ────────────────────────────────────────────────────────────
+
+  t.test('creates a category', { tags: ['categories', 'create'] }, async () => {
+    const res = await t.api.post('/v1/categories', { name: 'Violins', sortOrder: 1 })
+    t.assert.status(res, 201)
+    t.assert.equal(res.data.name, 'Violins')
+    t.assert.equal(res.data.sortOrder, 1)
+    t.assert.equal(res.data.isActive, true)
+    t.assert.ok(res.data.id)
+  })
+
+  t.test('rejects category without name', { tags: ['categories', 'create', 'validation'] }, async () => {
+    const res = await t.api.post('/v1/categories', {})
+    t.assert.status(res, 400)
+  })
+
+  t.test('lists categories with pagination', { tags: ['categories', 'list'] }, async () => {
+    await t.api.post('/v1/categories', { name: 'Cat List A' })
+    await t.api.post('/v1/categories', { name: 'Cat List B' })
+    const res = await t.api.get('/v1/categories', { page: 1, limit: 25 })
+    t.assert.status(res, 200)
+    t.assert.ok(res.data.data.length >= 2)
+    t.assert.ok(res.data.pagination)
+  })
+
+  t.test('gets category by id', { tags: ['categories', 'read'] }, async () => {
+    const created = await t.api.post('/v1/categories', { name: 'Get By ID Cat' })
+    const res = await t.api.get(`/v1/categories/${created.data.id}`)
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.name, 'Get By ID Cat')
+  })
+
+  t.test('returns 404 for missing category', { tags: ['categories', 'read'] }, async () => {
+    const res = await t.api.get('/v1/categories/a0000000-0000-0000-0000-999999999999')
+    t.assert.status(res, 404)
+  })
+
+  t.test('updates a category', { tags: ['categories', 'update'] }, async () => {
+    const created = await t.api.post('/v1/categories', { name: 'Before Update' })
+    const res = await t.api.patch(`/v1/categories/${created.data.id}`, { name: 'After Update', sortOrder: 5 })
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.name, 'After Update')
+    t.assert.equal(res.data.sortOrder, 5)
+  })
+
+  t.test('soft-deletes a category', { tags: ['categories', 'delete'] }, async () => {
+    const created = await t.api.post('/v1/categories', { name: 'To Delete Cat' })
+    const res = await t.api.del(`/v1/categories/${created.data.id}`)
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.isActive, false)
+  })
+
+  // ─── Suppliers ─────────────────────────────────────────────────────────────
+
+  t.test('creates a supplier', { tags: ['suppliers', 'create'] }, async () => {
+    const res = await t.api.post('/v1/suppliers', {
+      name: 'Shar Music',
+      email: 'orders@sharmusic.com',
+      phone: '800-248-7427',
+      paymentTerms: 'Net 30',
+    })
+    t.assert.status(res, 201)
+    t.assert.equal(res.data.name, 'Shar Music')
+    t.assert.equal(res.data.paymentTerms, 'Net 30')
+    t.assert.ok(res.data.id)
+  })
+
+  t.test('rejects supplier without name', { tags: ['suppliers', 'create', 'validation'] }, async () => {
+    const res = await t.api.post('/v1/suppliers', { email: 'x@x.com' })
+    t.assert.status(res, 400)
+  })
+
+  t.test('lists suppliers with pagination', { tags: ['suppliers', 'list'] }, async () => {
+    await t.api.post('/v1/suppliers', { name: 'Sup List A' })
+    await t.api.post('/v1/suppliers', { name: 'Sup List B' })
+    const res = await t.api.get('/v1/suppliers', { page: 1, limit: 25 })
+    t.assert.status(res, 200)
+    t.assert.ok(res.data.data.length >= 2)
+    t.assert.ok(res.data.pagination.total >= 2)
+  })
+
+  t.test('searches suppliers by name', { tags: ['suppliers', 'list', 'search'] }, async () => {
+    await t.api.post('/v1/suppliers', { name: 'SearchableSupplierXYZ' })
+    const res = await t.api.get('/v1/suppliers', { q: 'SearchableSupplierXYZ' })
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.data.length, 1)
+    t.assert.equal(res.data.data[0].name, 'SearchableSupplierXYZ')
+  })
+
+  t.test('updates a supplier', { tags: ['suppliers', 'update'] }, async () => {
+    const created = await t.api.post('/v1/suppliers', { name: 'Old Supplier Name' })
+    const res = await t.api.patch(`/v1/suppliers/${created.data.id}`, { name: 'New Supplier Name', accountNumber: 'ACC-001' })
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.name, 'New Supplier Name')
+    t.assert.equal(res.data.accountNumber, 'ACC-001')
+  })
+
+  t.test('soft-deletes a supplier', { tags: ['suppliers', 'delete'] }, async () => {
+    const created = await t.api.post('/v1/suppliers', { name: 'To Delete Sup' })
+    const res = await t.api.del(`/v1/suppliers/${created.data.id}`)
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.isActive, false)
+  })
+
+  // ─── Products ──────────────────────────────────────────────────────────────
+
+  t.test('creates a product', { tags: ['products', 'create'] }, async () => {
+    const res = await t.api.post('/v1/products', {
+      name: 'Violin 4/4 Student',
+      sku: 'VLN-44-TST',
+      brand: 'Eastman',
+      price: 399,
+      isSerialized: true,
+      isRental: true,
+      isActive: true,
+    })
+    t.assert.status(res, 201)
+    t.assert.equal(res.data.name, 'Violin 4/4 Student')
+    t.assert.equal(res.data.sku, 'VLN-44-TST')
+    t.assert.equal(res.data.price, '399.00')
+    t.assert.equal(res.data.isSerialized, true)
+    t.assert.ok(res.data.id)
+  })
+
+  t.test('rejects product without name', { tags: ['products', 'create', 'validation'] }, async () => {
+    const res = await t.api.post('/v1/products', { sku: 'NO-NAME' })
+    t.assert.status(res, 400)
+  })
+
+  t.test('lists products with pagination', { tags: ['products', 'list'] }, async () => {
+    await t.api.post('/v1/products', { name: 'Prod List A', price: 100 })
+    await t.api.post('/v1/products', { name: 'Prod List B', price: 200 })
+    const res = await t.api.get('/v1/products', { page: 1, limit: 25 })
+    t.assert.status(res, 200)
+    t.assert.ok(res.data.data.length >= 2)
+    t.assert.ok(res.data.pagination)
+  })
+
+  t.test('searches products by name', { tags: ['products', 'list', 'search'] }, async () => {
+    await t.api.post('/v1/products', { name: 'SearchableViolinXYZ' })
+    const res = await t.api.get('/v1/products', { q: 'SearchableViolinXYZ' })
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.data.length, 1)
+    t.assert.equal(res.data.data[0].name, 'SearchableViolinXYZ')
+  })
+
+  t.test('filters products by categoryId', { tags: ['products', 'list', 'filter'] }, async () => {
+    const cat = await t.api.post('/v1/categories', { name: 'FilterCat' })
+    await t.api.post('/v1/products', { name: 'In Cat Prod', categoryId: cat.data.id })
+    await t.api.post('/v1/products', { name: 'No Cat Prod' })
+    const res = await t.api.get('/v1/products', { categoryId: cat.data.id })
+    t.assert.status(res, 200)
+    t.assert.ok(res.data.data.every((p: any) => p.categoryId === cat.data.id))
+  })
+
+  t.test('gets product by id', { tags: ['products', 'read'] }, async () => {
+    const created = await t.api.post('/v1/products', { name: 'Get By ID Prod' })
+    const res = await t.api.get(`/v1/products/${created.data.id}`)
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.name, 'Get By ID Prod')
+  })
+
+  t.test('returns 404 for missing product', { tags: ['products', 'read'] }, async () => {
+    const res = await t.api.get('/v1/products/a0000000-0000-0000-0000-999999999999')
+    t.assert.status(res, 404)
+  })
+
+  t.test('updates a product and records price history', { tags: ['products', 'update', 'price-history'] }, async () => {
+    const created = await t.api.post('/v1/products', { name: 'Price Test Prod', price: 100 })
+    const res = await t.api.patch(`/v1/products/${created.data.id}`, { price: 150, name: 'Price Test Prod Updated' })
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.price, '150.00')
+    const history = await t.api.get(`/v1/products/${created.data.id}/price-history`)
+    t.assert.status(history, 200)
+    t.assert.equal(history.data.data.length, 1)
+    t.assert.equal(history.data.data[0].previousPrice, '100.00')
+    t.assert.equal(history.data.data[0].newPrice, '150.00')
+  })
+
+  t.test('price history is empty for new product', { tags: ['products', 'price-history'] }, async () => {
+    const created = await t.api.post('/v1/products', { name: 'No History Prod', price: 50 })
+    const res = await t.api.get(`/v1/products/${created.data.id}/price-history`)
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.data.length, 0)
+  })
+
+  t.test('soft-deletes a product', { tags: ['products', 'delete'] }, async () => {
+    const created = await t.api.post('/v1/products', { name: 'To Delete Prod' })
+    const res = await t.api.del(`/v1/products/${created.data.id}`)
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.isActive, false)
+  })
+
+  // ─── Inventory Units ───────────────────────────────────────────────────────
+
+  t.test('creates a serialized unit', { tags: ['units', 'create'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Serial Prod', isSerialized: true })
+    const res = await t.api.post(`/v1/products/${prod.data.id}/units`, {
+      serialNumber: 'SN-001',
+      condition: 'new',
+      status: 'available',
+      purchaseCost: 185,
+    })
+    t.assert.status(res, 201)
+    t.assert.equal(res.data.serialNumber, 'SN-001')
+    t.assert.equal(res.data.condition, 'new')
+    t.assert.equal(res.data.status, 'available')
+    t.assert.equal(res.data.purchaseCost, '185.00')
+  })
+
+  t.test('lists units for a product', { tags: ['units', 'list'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Multi Unit Prod', isSerialized: true })
+    await t.api.post(`/v1/products/${prod.data.id}/units`, { serialNumber: 'SN-A', condition: 'new', status: 'available' })
+    await t.api.post(`/v1/products/${prod.data.id}/units`, { serialNumber: 'SN-B', condition: 'good', status: 'rented' })
+    const res = await t.api.get(`/v1/products/${prod.data.id}/units`)
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.data.length, 2)
+  })
+
+  t.test('updates a unit status', { tags: ['units', 'update'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Update Unit Prod', isSerialized: true })
+    const unit = await t.api.post(`/v1/products/${prod.data.id}/units`, { serialNumber: 'SN-UPD', condition: 'good', status: 'available' })
+    const res = await t.api.patch(`/v1/units/${unit.data.id}`, { status: 'rented', notes: 'Rented to customer A' })
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.status, 'rented')
+    t.assert.equal(res.data.notes, 'Rented to customer A')
+  })
+
+  // ─── Product Suppliers ─────────────────────────────────────────────────────
+
+  t.test('links a supplier to a product', { tags: ['product-suppliers', 'create'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Linkable Prod' })
+    const sup = await t.api.post('/v1/suppliers', { name: 'Link Supplier' })
+    const res = await t.api.post(`/v1/products/${prod.data.id}/suppliers`, {
+      supplierId: sup.data.id,
+      supplierSku: 'SUP-SKU-001',
+      isPreferred: true,
+    })
+    t.assert.status(res, 201)
+    t.assert.equal(res.data.supplierId, sup.data.id)
+    t.assert.equal(res.data.supplierSku, 'SUP-SKU-001')
+    t.assert.equal(res.data.isPreferred, true)
+  })
+
+  t.test('lists suppliers for a product with joined supplier details', { tags: ['product-suppliers', 'list'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Supplier List Prod' })
+    const sup1 = await t.api.post('/v1/suppliers', { name: 'Supplier Alpha', paymentTerms: 'Net 30' })
+    const sup2 = await t.api.post('/v1/suppliers', { name: 'Supplier Beta' })
+    await t.api.post(`/v1/products/${prod.data.id}/suppliers`, { supplierId: sup1.data.id, isPreferred: true })
+    await t.api.post(`/v1/products/${prod.data.id}/suppliers`, { supplierId: sup2.data.id, isPreferred: false })
+    const res = await t.api.get(`/v1/products/${prod.data.id}/suppliers`)
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.data.length, 2)
+    // preferred comes first
+    t.assert.equal(res.data.data[0].supplierName, 'Supplier Alpha')
+    t.assert.equal(res.data.data[0].isPreferred, true)
+    t.assert.equal(res.data.data[0].supplierPaymentTerms, 'Net 30')
+    t.assert.equal(res.data.data[1].supplierName, 'Supplier Beta')
+  })
+
+  t.test('preferred flag moves to new supplier when set', { tags: ['product-suppliers', 'preferred'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Preferred Test Prod' })
+    const sup1 = await t.api.post('/v1/suppliers', { name: 'Pref Sup A' })
+    const sup2 = await t.api.post('/v1/suppliers', { name: 'Pref Sup B' })
+    const link1 = await t.api.post(`/v1/products/${prod.data.id}/suppliers`, { supplierId: sup1.data.id, isPreferred: true })
+    t.assert.equal(link1.data.isPreferred, true)
+    // Link second supplier as preferred — first should lose preferred status
+    await t.api.post(`/v1/products/${prod.data.id}/suppliers`, { supplierId: sup2.data.id, isPreferred: true })
+    const list = await t.api.get(`/v1/products/${prod.data.id}/suppliers`)
+    const a = list.data.data.find((s: any) => s.supplierId === sup1.data.id)
+    const b = list.data.data.find((s: any) => s.supplierId === sup2.data.id)
+    t.assert.equal(a.isPreferred, false)
+    t.assert.equal(b.isPreferred, true)
+  })
+
+  t.test('updates a product-supplier link', { tags: ['product-suppliers', 'update'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Update Link Prod' })
+    const sup = await t.api.post('/v1/suppliers', { name: 'Update Link Sup' })
+    const link = await t.api.post(`/v1/products/${prod.data.id}/suppliers`, { supplierId: sup.data.id, supplierSku: 'OLD-SKU' })
+    const res = await t.api.patch(`/v1/products/${prod.data.id}/suppliers/${link.data.id}`, { supplierSku: 'NEW-SKU' })
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.supplierSku, 'NEW-SKU')
+  })
+
+  t.test('removes a supplier link', { tags: ['product-suppliers', 'delete'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Remove Link Prod' })
+    const sup = await t.api.post('/v1/suppliers', { name: 'Remove Link Sup' })
+    const link = await t.api.post(`/v1/products/${prod.data.id}/suppliers`, { supplierId: sup.data.id })
+    const res = await t.api.del(`/v1/products/${prod.data.id}/suppliers/${link.data.id}`)
+    t.assert.status(res, 200)
+    const list = await t.api.get(`/v1/products/${prod.data.id}/suppliers`)
+    t.assert.equal(list.data.data.length, 0)
+  })
+
+  t.test('returns 404 for missing product-supplier link update', { tags: ['product-suppliers', 'update'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Missing Link Prod' })
+    const res = await t.api.patch(`/v1/products/${prod.data.id}/suppliers/a0000000-0000-0000-0000-999999999999`, { supplierSku: 'X' })
+    t.assert.status(res, 404)
+  })
+
+  // ─── Stock Receipts ────────────────────────────────────────────────────────
+
+  t.test('records a stock receipt and increments qty_on_hand', { tags: ['stock-receipts', 'create'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Rosin Stock', qtyOnHand: 10 })
+    const res = await t.api.post(`/v1/products/${prod.data.id}/stock-receipts`, {
+      qty: 5,
+      costPerUnit: 6.50,
+      receivedDate: '2026-03-15',
+      invoiceNumber: 'INV-2026-001',
+    })
+    t.assert.status(res, 201)
+    t.assert.equal(res.data.qty, 5)
+    t.assert.equal(res.data.costPerUnit, '6.50')
+    t.assert.equal(res.data.totalCost, '32.50')
+    t.assert.equal(res.data.invoiceNumber, 'INV-2026-001')
+    // qty_on_hand should have increased
+    const updated = await t.api.get(`/v1/products/${prod.data.id}`)
+    t.assert.equal(updated.data.qtyOnHand, 15)
+  })
+
+  t.test('records receipt with supplier link', { tags: ['stock-receipts', 'create'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Strings Stock' })
+    const sup = await t.api.post('/v1/suppliers', { name: 'Receipt Supplier' })
+    const res = await t.api.post(`/v1/products/${prod.data.id}/stock-receipts`, {
+      supplierId: sup.data.id,
+      qty: 12,
+      costPerUnit: 19.50,
+      receivedDate: '2026-03-20',
+    })
+    t.assert.status(res, 201)
+    t.assert.equal(res.data.supplierId, sup.data.id)
+  })
+
+  t.test('does not increment qty for serialized products', { tags: ['stock-receipts', 'create'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Serial Stock', isSerialized: true, qtyOnHand: 0 })
+    await t.api.post(`/v1/products/${prod.data.id}/stock-receipts`, {
+      qty: 1,
+      costPerUnit: 185,
+      receivedDate: '2026-03-01',
+    })
+    const updated = await t.api.get(`/v1/products/${prod.data.id}`)
+    t.assert.equal(updated.data.qtyOnHand, 0)
+  })
+
+  t.test('lists stock receipts for a product', { tags: ['stock-receipts', 'list'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'List Receipts Prod' })
+    await t.api.post(`/v1/products/${prod.data.id}/stock-receipts`, { qty: 10, costPerUnit: 5, receivedDate: '2026-01-10' })
+    await t.api.post(`/v1/products/${prod.data.id}/stock-receipts`, { qty: 20, costPerUnit: 4.75, receivedDate: '2026-02-15' })
+    const res = await t.api.get(`/v1/products/${prod.data.id}/stock-receipts`)
+    t.assert.status(res, 200)
+    t.assert.equal(res.data.data.length, 2)
+    // most recent date first
+    t.assert.equal(res.data.data[0].receivedDate, '2026-02-15')
+  })
+
+  t.test('rejects receipt with missing required fields', { tags: ['stock-receipts', 'validation'] }, async () => {
+    const prod = await t.api.post('/v1/products', { name: 'Invalid Receipt Prod' })
+    const res = await t.api.post(`/v1/products/${prod.data.id}/stock-receipts`, { qty: 5 })
+    t.assert.status(res, 400)
+  })
+})
diff --git a/packages/backend/src/db/seeds/music-store-seed.ts b/packages/backend/src/db/seeds/music-store-seed.ts
index 1b1ade6..8c17853 100644
--- a/packages/backend/src/db/seeds/music-store-seed.ts
+++ b/packages/backend/src/db/seeds/music-store-seed.ts
@@ -162,6 +162,13 @@ async function seed() {
     }
   }
 
+  // --- Enable inventory module ---
+  await sql`UPDATE module_config SET enabled = true WHERE slug = 'inventory'`
+  console.log('  Enabled inventory module')
+
+  // --- Inventory seed data ---
+  await seedInventory(sql)
+
   // --- Enable lessons module ---
   await sql`UPDATE module_config SET enabled = true WHERE slug = 'lessons'`
   console.log('  Enabled lessons module')
@@ -173,6 +180,776 @@ async function seed() {
   await sql.end()
 }
 
+async function seedInventory(sql: any) {
+  console.log('\nSeeding inventory data...')
+
+  // ── Suppliers ─────────────────────────────────────────────────────────────
+  const supplierDefs = [
+    { name: 'Shar Music', contactName: 'Sales Desk', email: 'orders@sharmusic.com', phone: '800-248-7427', website: 'sharmusic.com', paymentTerms: 'Net 30' },
+    { name: 'Southwest Strings', contactName: 'Dealer Rep', email: 'dealer@swstrings.com', phone: '800-528-3430', website: 'swstrings.com', paymentTerms: 'Net 30' },
+    { name: 'Connolly Music', contactName: 'Account Rep', email: 'wholesale@connollymusic.com', phone: '800-644-5268', website: 'connollymusic.com', paymentTerms: 'Net 60' },
+    { name: 'D\'Addario', contactName: 'Dealer Services', email: 'dealer@daddario.com', phone: '800-323-2746', website: 'daddario.com', paymentTerms: 'Net 30' },
+    { name: 'Pirastro', contactName: 'US Distributor', email: 'us@pirastro.com', phone: '800-223-2500', website: 'pirastro.com', paymentTerms: 'Net 30' },
+  ]
+
+  const supplierIds: Record<string, string> = {}
+  for (const s of supplierDefs) {
+    const [existing] = await sql`SELECT id FROM supplier WHERE name = ${s.name}`
+    if (existing) { supplierIds[s.name] = existing.id; continue }
+    const [row] = await sql`INSERT INTO supplier (name, contact_name, email, phone, website, payment_terms) VALUES (${s.name}, ${s.contactName}, ${s.email}, ${s.phone}, ${s.website}, ${s.paymentTerms}) RETURNING id`
+    supplierIds[s.name] = row.id
+    console.log(`  Supplier: ${s.name}`)
+  }
+
+  // ── Categories ─────────────────────────────────────────────────────────────
+  const categoryDefs = [
+    { name: 'Violins', sortOrder: 1 },
+    { name: 'Violas', sortOrder: 2 },
+    { name: 'Cellos', sortOrder: 3 },
+    { name: 'Basses', sortOrder: 4 },
+    { name: 'Bows', sortOrder: 5 },
+    { name: 'Strings & Accessories', sortOrder: 6 },
+    { name: 'Cases & Bags', sortOrder: 7 },
+    { name: 'Rosin', sortOrder: 8 },
+    { name: 'Shoulder Rests', sortOrder: 9 },
+    { name: 'Sheet Music & Books', sortOrder: 10 },
+    { name: 'Maintenance & Care', sortOrder: 11 },
+  ]
+
+  const catIds: Record<string, string> = {}
+  for (const c of categoryDefs) {
+    const [existing] = await sql`SELECT id FROM category WHERE name = ${c.name}`
+    if (existing) { catIds[c.name] = existing.id; continue }
+    const [row] = await sql`INSERT INTO category (name, sort_order) VALUES (${c.name}, ${c.sortOrder}) RETURNING id`
+    catIds[c.name] = row.id
+    console.log(`  Category: ${c.name}`)
+  }
+
+  // ── Products ───────────────────────────────────────────────────────────────
+  // isSerialized=true → track individual units; isRental=true → available for rental
+  type ProductDef = {
+    name: string; sku: string; brand: string; model: string; category: string
+    price: string; minPrice?: string; rentalRateMonthly?: string
+    isSerialized: boolean; isRental: boolean; isDualUseRepair?: boolean
+    qtyOnHand?: number; qtyReorderPoint?: number; description?: string
+  }
+
+  const productDefs: ProductDef[] = [
+    // ── Violins ──
+    {
+      name: 'Violin 4/4 — Student Outfit', sku: 'VLN-44-STU', brand: 'Eastman', model: 'VL80',
+      category: 'Violins', price: '399.00', minPrice: '350.00', rentalRateMonthly: '25.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: 'Full-size student violin outfit includes bow, rosin, and lightweight case.',
+    },
+    {
+      name: 'Violin 3/4 — Student Outfit', sku: 'VLN-34-STU', brand: 'Eastman', model: 'VL80',
+      category: 'Violins', price: '349.00', minPrice: '300.00', rentalRateMonthly: '22.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: '3/4 size student violin outfit — ideal for players ages 7–10.',
+    },
+    {
+      name: 'Violin 1/2 — Student Outfit', sku: 'VLN-12-STU', brand: 'Eastman', model: 'VL80',
+      category: 'Violins', price: '299.00', minPrice: '260.00', rentalRateMonthly: '20.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: '1/2 size student violin outfit — ideal for players ages 5–7.',
+    },
+    {
+      name: 'Violin 1/4 — Student Outfit', sku: 'VLN-14-STU', brand: 'Eastman', model: 'VL80',
+      category: 'Violins', price: '249.00', minPrice: '220.00', rentalRateMonthly: '18.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: '1/4 size student violin outfit — ideal for players ages 4–6.',
+    },
+    {
+      name: 'Violin 4/4 — Intermediate', sku: 'VLN-44-INT', brand: 'Eastman', model: 'VL305',
+      category: 'Violins', price: '895.00', minPrice: '800.00', rentalRateMonthly: '45.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: 'Carved spruce top and maple back/sides. Excellent step-up instrument.',
+    },
+    {
+      name: 'Violin 4/4 — Advanced', sku: 'VLN-44-ADV', brand: 'Eastman', model: 'VL605',
+      category: 'Violins', price: '2495.00', minPrice: '2200.00',
+      isSerialized: true, isRental: false, isDualUseRepair: false,
+      description: 'Hand-carved workshop violin with Dominant strings. Concert-ready.',
+    },
+
+    // ── Violas ──
+    {
+      name: 'Viola 15" — Student Outfit', sku: 'VLA-15-STU', brand: 'Eastman', model: 'VA80',
+      category: 'Violas', price: '449.00', minPrice: '400.00', rentalRateMonthly: '28.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: '15-inch student viola outfit with bow and lightweight case.',
+    },
+    {
+      name: 'Viola 16" — Student Outfit', sku: 'VLA-16-STU', brand: 'Eastman', model: 'VA80',
+      category: 'Violas', price: '449.00', minPrice: '400.00', rentalRateMonthly: '28.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: '16-inch student viola outfit with bow and lightweight case.',
+    },
+    {
+      name: 'Viola 16" — Intermediate', sku: 'VLA-16-INT', brand: 'Eastman', model: 'VA305',
+      category: 'Violas', price: '1095.00', minPrice: '950.00', rentalRateMonthly: '55.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: 'Step-up viola with carved top, warm dark tone. Includes quality bow and case.',
+    },
+
+    // ── Cellos ──
+    {
+      name: 'Cello 4/4 — Student Outfit', sku: 'CLO-44-STU', brand: 'Eastman', model: 'VC80',
+      category: 'Cellos', price: '649.00', minPrice: '580.00', rentalRateMonthly: '40.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: 'Full-size student cello outfit includes fiberglass bow and padded bag.',
+    },
+    {
+      name: 'Cello 3/4 — Student Outfit', sku: 'CLO-34-STU', brand: 'Eastman', model: 'VC80',
+      category: 'Cellos', price: '599.00', minPrice: '530.00', rentalRateMonthly: '36.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: '3/4 student cello outfit — ideal for players ages 9–12.',
+    },
+    {
+      name: 'Cello 1/2 — Student Outfit', sku: 'CLO-12-STU', brand: 'Eastman', model: 'VC80',
+      category: 'Cellos', price: '549.00', minPrice: '490.00', rentalRateMonthly: '32.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: '1/2 student cello outfit — ideal for players ages 7–10.',
+    },
+    {
+      name: 'Cello 4/4 — Intermediate', sku: 'CLO-44-INT', brand: 'Eastman', model: 'VC305',
+      category: 'Cellos', price: '1495.00', minPrice: '1300.00', rentalRateMonthly: '75.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: 'Carved spruce top intermediate cello. Powerful projection, warm tone.',
+    },
+
+    // ── Basses ──
+    {
+      name: 'Bass 3/4 — Student Outfit', sku: 'BAS-34-STU', brand: 'Engelhardt', model: 'ES-1',
+      category: 'Basses', price: '1299.00', minPrice: '1150.00', rentalRateMonthly: '65.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: '3/4 student laminate bass outfit. Standard school/orchestra size.',
+    },
+    {
+      name: 'Bass 1/2 — Student', sku: 'BAS-12-STU', brand: 'Eastman', model: 'VB80',
+      category: 'Basses', price: '1099.00', minPrice: '980.00', rentalRateMonthly: '55.00',
+      isSerialized: true, isRental: true, isDualUseRepair: false,
+      description: '1/2 size student double bass — ideal for younger players.',
+    },
+
+    // ── Bows ──
+    {
+      name: 'Violin Bow — Student Brazilwood', sku: 'BOW-VLN-STU', brand: 'CodaBow', model: 'Joule',
+      category: 'Bows', price: '89.00', minPrice: '75.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 8, qtyReorderPoint: 3,
+      description: 'Brazilwood student violin bow with nickel-silver winding.',
+    },
+    {
+      name: 'Violin Bow — Carbon Fiber', sku: 'BOW-VLN-CF', brand: 'CodaBow', model: 'Diamond NX',
+      category: 'Bows', price: '295.00', minPrice: '265.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 4, qtyReorderPoint: 2,
+      description: 'Lightweight carbon fiber violin bow. Excellent balance and response.',
+    },
+    {
+      name: 'Viola Bow — Student Brazilwood', sku: 'BOW-VLA-STU', brand: 'CodaBow', model: 'Joule',
+      category: 'Bows', price: '95.00', minPrice: '80.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 5, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Cello Bow — Student Brazilwood', sku: 'BOW-CLO-STU', brand: 'CodaBow', model: 'Joule',
+      category: 'Bows', price: '110.00', minPrice: '95.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 5, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Bass Bow — Student Brazilwood (German)', sku: 'BOW-BAS-STU-G', brand: 'Glasser', model: 'German',
+      category: 'Bows', price: '85.00', minPrice: '70.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 4, qtyReorderPoint: 2,
+    },
+
+    // ── Strings (also used as repair line items) ──
+    {
+      name: 'Violin Strings — Dominant 4/4 Set', sku: 'STR-VLN-DOM-44', brand: 'Thomastik', model: 'Dominant',
+      category: 'Strings & Accessories', price: '38.00', minPrice: '32.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 20, qtyReorderPoint: 6,
+      description: 'Industry-standard synthetic core violin string set. Full size.',
+    },
+    {
+      name: 'Violin Strings — Dominant 3/4 Set', sku: 'STR-VLN-DOM-34', brand: 'Thomastik', model: 'Dominant',
+      category: 'Strings & Accessories', price: '38.00', minPrice: '32.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 12, qtyReorderPoint: 4,
+    },
+    {
+      name: 'Violin Strings — Prelude 4/4 Set', sku: 'STR-VLN-PRE-44', brand: "D'Addario", model: 'Prelude',
+      category: 'Strings & Accessories', price: '18.00', minPrice: '15.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 24, qtyReorderPoint: 8,
+      description: 'Budget-friendly solid steel core strings. Great for beginners.',
+    },
+    {
+      name: 'Viola Strings — Dominant Set', sku: 'STR-VLA-DOM', brand: 'Thomastik', model: 'Dominant',
+      category: 'Strings & Accessories', price: '52.00', minPrice: '45.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 10, qtyReorderPoint: 3,
+    },
+    {
+      name: 'Cello Strings — Prelude Set', sku: 'STR-CLO-PRE', brand: "D'Addario", model: 'Prelude',
+      category: 'Strings & Accessories', price: '38.00', minPrice: '32.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 12, qtyReorderPoint: 4,
+    },
+    {
+      name: 'Cello Strings — Larsen Set', sku: 'STR-CLO-LAR', brand: 'Larsen', model: 'Original',
+      category: 'Strings & Accessories', price: '95.00', minPrice: '85.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 6, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Bass Strings — Helicore Orchestral 3/4 Set', sku: 'STR-BAS-HEL', brand: "D'Addario", model: 'Helicore Orchestral',
+      category: 'Strings & Accessories', price: '110.00', minPrice: '95.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 8, qtyReorderPoint: 2,
+    },
+
+    // ── Rosin ──
+    {
+      name: 'Rosin — Hill Light', sku: 'RSN-HILL-L', brand: 'Hill', model: 'Light',
+      category: 'Rosin', price: '8.00', minPrice: '6.50',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 30, qtyReorderPoint: 10,
+      description: 'Light rosin for violin and viola. Low dust.',
+    },
+    {
+      name: 'Rosin — Hill Dark', sku: 'RSN-HILL-D', brand: 'Hill', model: 'Dark',
+      category: 'Rosin', price: '8.00', minPrice: '6.50',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 20, qtyReorderPoint: 8,
+      description: 'Dark rosin for cello and bass.',
+    },
+    {
+      name: 'Rosin — Pirastro Goldflex', sku: 'RSN-PIR-GF', brand: 'Pirastro', model: 'Goldflex',
+      category: 'Rosin', price: '14.00', minPrice: '11.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 15, qtyReorderPoint: 5,
+    },
+
+    // ── Shoulder Rests ──
+    {
+      name: 'Shoulder Rest — Kun Original 4/4', sku: 'SR-KUN-44', brand: 'Kun', model: 'Original',
+      category: 'Shoulder Rests', price: '28.00', minPrice: '23.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 12, qtyReorderPoint: 4,
+      description: 'Collapsible violin shoulder rest with rubber feet.',
+    },
+    {
+      name: 'Shoulder Rest — Kun Collapsible 3/4–4/4', sku: 'SR-KUN-C', brand: 'Kun', model: 'Collapsible',
+      category: 'Shoulder Rests', price: '35.00', minPrice: '29.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 8, qtyReorderPoint: 3,
+    },
+    {
+      name: 'Shoulder Rest — Bon Musica 4/4', sku: 'SR-BON-44', brand: 'Bon Musica', model: '4/4',
+      category: 'Shoulder Rests', price: '42.00', minPrice: '36.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 6, qtyReorderPoint: 2,
+      description: 'Curved metal shoulder rest with contoured padding. Great for players with shoulder issues.',
+    },
+
+    // ── Maintenance ──
+    {
+      name: 'String Cleaner — Ultra X-Cleaner', sku: 'MNT-CLN-STR', brand: 'Ultra', model: 'X-Cleaner',
+      category: 'Maintenance & Care', price: '12.00', minPrice: '9.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 18, qtyReorderPoint: 6,
+    },
+    {
+      name: 'Instrument Polish — Hill', sku: 'MNT-POL-HILL', brand: 'Hill', model: 'Polish',
+      category: 'Maintenance & Care', price: '10.00', minPrice: '8.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 15, qtyReorderPoint: 5,
+    },
+    // ── Repair Parts ──
+    {
+      name: 'Bridge — Violin 4/4 Blank', sku: 'RPR-BRG-VLN-44', brand: 'Aubert', model: 'Mirecourt',
+      category: 'Maintenance & Care', price: '18.00', minPrice: '14.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 10, qtyReorderPoint: 4,
+      description: 'Aubert Mirecourt violin bridge blank. Requires fitting.',
+    },
+    {
+      name: 'Bridge — Violin 3/4 Blank', sku: 'RPR-BRG-VLN-34', brand: 'Aubert', model: 'Mirecourt',
+      category: 'Maintenance & Care', price: '16.00', minPrice: '12.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 6, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Bridge — Viola Blank', sku: 'RPR-BRG-VLA', brand: 'Aubert', model: 'Mirecourt',
+      category: 'Maintenance & Care', price: '22.00', minPrice: '17.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 6, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Bridge — Cello Blank', sku: 'RPR-BRG-CLO', brand: 'Aubert', model: 'Mirecourt',
+      category: 'Maintenance & Care', price: '32.00', minPrice: '25.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 4, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Bridge — Bass Blank', sku: 'RPR-BRG-BAS', brand: 'Aubert', model: 'Mirecourt',
+      category: 'Maintenance & Care', price: '48.00', minPrice: '38.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 3, qtyReorderPoint: 1,
+    },
+    {
+      name: 'Tailpiece — Violin 4/4 Composite', sku: 'RPR-TLP-VLN-44', brand: 'Wittner', model: 'Ultra',
+      category: 'Maintenance & Care', price: '14.00', minPrice: '11.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 8, qtyReorderPoint: 3,
+      description: 'Wittner Ultra composite tailpiece with integrated fine tuners.',
+    },
+    {
+      name: 'Tailpiece — Cello 4/4 Composite', sku: 'RPR-TLP-CLO-44', brand: 'Wittner', model: 'Ultra',
+      category: 'Maintenance & Care', price: '22.00', minPrice: '17.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 4, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Pegs — Violin Boxwood Set (4)', sku: 'RPR-PEG-VLN-BX', brand: 'Generic', model: 'Boxwood',
+      category: 'Maintenance & Care', price: '12.00', minPrice: '9.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 12, qtyReorderPoint: 4,
+      description: 'Boxwood violin pegs, set of 4. Requires fitting and reaming.',
+    },
+    {
+      name: 'Pegs — Viola Boxwood Set (4)', sku: 'RPR-PEG-VLA-BX', brand: 'Generic', model: 'Boxwood',
+      category: 'Maintenance & Care', price: '14.00', minPrice: '11.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 8, qtyReorderPoint: 3,
+    },
+    {
+      name: 'Pegs — Cello Boxwood Set (4)', sku: 'RPR-PEG-CLO-BX', brand: 'Generic', model: 'Boxwood',
+      category: 'Maintenance & Care', price: '18.00', minPrice: '14.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 6, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Fine Tuner — Single Violin', sku: 'RPR-FTN-VLN', brand: 'Wittner', model: 'Finetune',
+      category: 'Maintenance & Care', price: '4.00', minPrice: '3.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 20, qtyReorderPoint: 8,
+    },
+    {
+      name: 'Endpin — Cello Replacement', sku: 'RPR-EPN-CLO', brand: 'Wittner', model: 'Finetune',
+      category: 'Maintenance & Care', price: '24.00', minPrice: '18.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 4, qtyReorderPoint: 2,
+      description: 'Replacement cello endpin with aluminum sleeve.',
+    },
+    {
+      name: 'Endpin — Bass Replacement', sku: 'RPR-EPN-BAS', brand: 'Wittner', model: 'Finetune',
+      category: 'Maintenance & Care', price: '32.00', minPrice: '24.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 3, qtyReorderPoint: 1,
+    },
+    {
+      name: 'Nut — Violin Ebony Blank', sku: 'RPR-NUT-VLN', brand: 'Generic', model: 'Ebony',
+      category: 'Maintenance & Care', price: '6.00', minPrice: '4.50',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 10, qtyReorderPoint: 4,
+    },
+    {
+      name: 'Seam Glue — Hide Glue (4 oz)', sku: 'RPR-GLU-HIDE', brand: 'Franklin', model: 'Hide Glue',
+      category: 'Maintenance & Care', price: '8.00', minPrice: '6.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 6, qtyReorderPoint: 2,
+      description: 'Traditional hide glue for open seam and structural repairs.',
+    },
+    {
+      name: 'Sound Post — Violin', sku: 'RPR-SPS-VLN', brand: 'Generic', model: 'Spruce',
+      category: 'Maintenance & Care', price: '5.00', minPrice: '3.50',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 8, qtyReorderPoint: 3,
+    },
+    {
+      name: 'Sound Post — Cello', sku: 'RPR-SPS-CLO', brand: 'Generic', model: 'Spruce',
+      category: 'Maintenance & Care', price: '8.00', minPrice: '6.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 4, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Bow Hair — Mongolian White (hank)', sku: 'RPR-HAIR-WH', brand: 'Generic', model: 'Mongolian White',
+      category: 'Maintenance & Care', price: '18.00', minPrice: '14.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 10, qtyReorderPoint: 3,
+      description: 'Mongolian white bow hair for rehairing violin, viola, cello, or bass bows.',
+    },
+    {
+      name: 'Peg Compound — Hill Peg Dope', sku: 'RPR-PEG-DOC', brand: 'Hill', model: 'Peg Compound',
+      category: 'Maintenance & Care', price: '6.00', minPrice: '4.50',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 12, qtyReorderPoint: 4,
+      description: 'Hill peg compound for slipping or sticking pegs.',
+    },
+    {
+      name: 'Fingerboard Oil — Lemon Oil (2 oz)', sku: 'RPR-OIL-LMN', brand: 'Music Nomad', model: 'Lemon Oil',
+      category: 'Maintenance & Care', price: '9.00', minPrice: '7.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 10, qtyReorderPoint: 4,
+      description: 'Conditions and cleans ebony and rosewood fingerboards.',
+    },
+    {
+      name: 'Chin Rest — Violin Guarneri Style', sku: 'RPR-CHN-VLN-GU', brand: 'Wittner', model: 'Guarneri',
+      category: 'Maintenance & Care', price: '16.00', minPrice: '12.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 8, qtyReorderPoint: 3,
+      description: 'Wittner composite Guarneri-style violin chin rest. Center mount.',
+    },
+    {
+      name: 'Chin Rest — Viola Side Mount', sku: 'RPR-CHN-VLA-SD', brand: 'Wittner', model: 'Augsburg',
+      category: 'Maintenance & Care', price: '18.00', minPrice: '14.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 6, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Chin Rest Screws — Replacement Set', sku: 'RPR-CHN-SCR', brand: 'Generic', model: 'Brass',
+      category: 'Maintenance & Care', price: '3.00', minPrice: '2.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 20, qtyReorderPoint: 8,
+      description: 'Replacement brass chin rest barrel screws, set of 2.',
+    },
+    {
+      name: 'Bow Grip — Leather Violin/Viola', sku: 'RPR-GRP-VLN', brand: 'Generic', model: 'Leather',
+      category: 'Maintenance & Care', price: '5.00', minPrice: '3.50',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 15, qtyReorderPoint: 6,
+      description: 'Replacement leather bow grip for violin or viola bow.',
+    },
+    {
+      name: 'Bow Grip — Leather Cello/Bass', sku: 'RPR-GRP-CLO', brand: 'Generic', model: 'Leather',
+      category: 'Maintenance & Care', price: '6.00', minPrice: '4.50',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 10, qtyReorderPoint: 4,
+    },
+    {
+      name: 'Bow Winding — Silver Lapping', sku: 'RPR-WND-SLV', brand: 'Generic', model: 'Silver',
+      category: 'Maintenance & Care', price: '8.00', minPrice: '6.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 8, qtyReorderPoint: 3,
+      description: 'Silver lapping wire for bow winding replacement.',
+    },
+    {
+      name: 'Bow Tip Plate — Violin Ivory-Style', sku: 'RPR-TIP-VLN', brand: 'Generic', model: 'Mammoth Ivory',
+      category: 'Maintenance & Care', price: '7.00', minPrice: '5.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 10, qtyReorderPoint: 4,
+      description: 'Replacement bow tip plate (mammoth ivory substitute).',
+    },
+    {
+      name: 'Saddle — Violin Ebony', sku: 'RPR-SDL-VLN', brand: 'Generic', model: 'Ebony',
+      category: 'Maintenance & Care', price: '5.00', minPrice: '3.50',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 10, qtyReorderPoint: 4,
+    },
+    {
+      name: 'Saddle — Cello Ebony', sku: 'RPR-SDL-CLO', brand: 'Generic', model: 'Ebony',
+      category: 'Maintenance & Care', price: '8.00', minPrice: '6.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 6, qtyReorderPoint: 2,
+    },
+    {
+      name: 'Retouching Varnish — Violin/Viola', sku: 'RPR-VRN-RTH', brand: 'Hammerl', model: 'Retouching',
+      category: 'Maintenance & Care', price: '22.00', minPrice: '17.00',
+      isSerialized: false, isRental: false, isDualUseRepair: true,
+      qtyOnHand: 4, qtyReorderPoint: 2,
+      description: 'Spirit-based retouching varnish for cosmetic repairs and touch-ups.',
+    },
+    {
+      name: 'Humidifier — Dampit Violin', sku: 'MNT-HUM-VLN', brand: 'Dampit', model: 'Violin',
+      category: 'Maintenance & Care', price: '16.00', minPrice: '13.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 12, qtyReorderPoint: 4,
+    },
+    {
+      name: 'Humidifier — Dampit Cello', sku: 'MNT-HUM-CLO', brand: 'Dampit', model: 'Cello',
+      category: 'Maintenance & Care', price: '18.00', minPrice: '15.00',
+      isSerialized: false, isRental: false,
+      qtyOnHand: 8, qtyReorderPoint: 3,
+    },
+  ]
+
+  const productIds: Record<string, string> = {}
+  for (const p of productDefs) {
+    const [existing] = await sql`SELECT id FROM product WHERE sku = ${p.sku}`
+    if (existing) { productIds[p.sku] = existing.id; continue }
+    const catId = catIds[p.category] ?? null
+    const [row] = await sql`
+      INSERT INTO product (sku, name, brand, model, category_id, price, min_price, rental_rate_monthly,
+        is_serialized, is_rental, is_dual_use_repair, qty_on_hand, qty_reorder_point, description, is_active)
+      VALUES (${p.sku}, ${p.name}, ${p.brand}, ${p.model}, ${catId}, ${p.price}, ${p.minPrice ?? null},
+        ${p.rentalRateMonthly ?? null}, ${p.isSerialized}, ${p.isRental}, ${p.isDualUseRepair ?? false},
+        ${p.qtyOnHand ?? 0}, ${p.qtyReorderPoint ?? null}, ${p.description ?? null}, true)
+      RETURNING id`
+    productIds[p.sku] = row.id
+    console.log(`  Product: ${p.name}`)
+  }
+
+  // ── Inventory Units (serialized instruments) ──────────────────────────────
+  type UnitDef = { sku: string; serial: string; condition: string; status: string; purchaseDate: string; cost: string; notes?: string }
+
+  const unitDefs: UnitDef[] = [
+    // Student violin 4/4 — rental fleet
+    { sku: 'VLN-44-STU', serial: 'EA-V80-001', condition: 'good', status: 'available', purchaseDate: '2022-08-15', cost: '185.00' },
+    { sku: 'VLN-44-STU', serial: 'EA-V80-002', condition: 'good', status: 'rented', purchaseDate: '2022-08-15', cost: '185.00' },
+    { sku: 'VLN-44-STU', serial: 'EA-V80-003', condition: 'fair', status: 'rented', purchaseDate: '2022-08-15', cost: '185.00', notes: 'Minor scratches on back' },
+    { sku: 'VLN-44-STU', serial: 'EA-V80-004', condition: 'good', status: 'rented', purchaseDate: '2022-08-15', cost: '185.00' },
+    { sku: 'VLN-44-STU', serial: 'EA-V80-005', condition: 'excellent', status: 'available', purchaseDate: '2023-06-01', cost: '195.00' },
+    { sku: 'VLN-44-STU', serial: 'EA-V80-006', condition: 'fair', status: 'in_repair', purchaseDate: '2021-08-01', cost: '175.00', notes: 'Pegs slipping, in shop' },
+    // Student violin 3/4
+    { sku: 'VLN-34-STU', serial: 'EA-V80-3Q-001', condition: 'good', status: 'available', purchaseDate: '2022-09-01', cost: '160.00' },
+    { sku: 'VLN-34-STU', serial: 'EA-V80-3Q-002', condition: 'good', status: 'rented', purchaseDate: '2022-09-01', cost: '160.00' },
+    { sku: 'VLN-34-STU', serial: 'EA-V80-3Q-003', condition: 'fair', status: 'rented', purchaseDate: '2021-09-01', cost: '155.00', notes: 'Repaired open seam 2023' },
+    // Student violin 1/2
+    { sku: 'VLN-12-STU', serial: 'EA-V80-HF-001', condition: 'good', status: 'rented', purchaseDate: '2022-09-01', cost: '140.00' },
+    { sku: 'VLN-12-STU', serial: 'EA-V80-HF-002', condition: 'good', status: 'available', purchaseDate: '2023-07-01', cost: '145.00' },
+    // Student violin 1/4
+    { sku: 'VLN-14-STU', serial: 'EA-V80-QT-001', condition: 'good', status: 'rented', purchaseDate: '2023-01-15', cost: '120.00' },
+    { sku: 'VLN-14-STU', serial: 'EA-V80-QT-002', condition: 'fair', status: 'available', purchaseDate: '2022-01-15', cost: '115.00', notes: 'Replaced tailpiece 2023' },
+    // Intermediate violin
+    { sku: 'VLN-44-INT', serial: 'EA-V305-001', condition: 'excellent', status: 'available', purchaseDate: '2023-08-01', cost: '420.00' },
+    { sku: 'VLN-44-INT', serial: 'EA-V305-002', condition: 'good', status: 'rented', purchaseDate: '2023-08-01', cost: '420.00' },
+    // Advanced violin
+    { sku: 'VLN-44-ADV', serial: 'EA-V605-001', condition: 'new', status: 'available', purchaseDate: '2024-02-01', cost: '1200.00' },
+
+    // Violas
+    { sku: 'VLA-15-STU', serial: 'EA-VA80-15-001', condition: 'good', status: 'rented', purchaseDate: '2022-09-01', cost: '210.00' },
+    { sku: 'VLA-15-STU', serial: 'EA-VA80-15-002', condition: 'excellent', status: 'available', purchaseDate: '2023-08-01', cost: '220.00' },
+    { sku: 'VLA-16-STU', serial: 'EA-VA80-16-001', condition: 'good', status: 'rented', purchaseDate: '2022-09-01', cost: '210.00' },
+    { sku: 'VLA-16-INT', serial: 'EA-VA305-001', condition: 'new', status: 'available', purchaseDate: '2024-01-15', cost: '520.00' },
+
+    // Cellos
+    { sku: 'CLO-44-STU', serial: 'EA-VC80-001', condition: 'good', status: 'rented', purchaseDate: '2021-08-15', cost: '300.00' },
+    { sku: 'CLO-44-STU', serial: 'EA-VC80-002', condition: 'good', status: 'rented', purchaseDate: '2021-08-15', cost: '300.00' },
+    { sku: 'CLO-44-STU', serial: 'EA-VC80-003', condition: 'fair', status: 'in_repair', purchaseDate: '2020-08-15', cost: '285.00', notes: 'Endpin mechanism worn, awaiting part' },
+    { sku: 'CLO-44-STU', serial: 'EA-VC80-004', condition: 'excellent', status: 'available', purchaseDate: '2023-09-01', cost: '315.00' },
+    { sku: 'CLO-34-STU', serial: 'EA-VC80-3Q-001', condition: 'good', status: 'rented', purchaseDate: '2022-08-15', cost: '275.00' },
+    { sku: 'CLO-12-STU', serial: 'EA-VC80-HF-001', condition: 'good', status: 'available', purchaseDate: '2023-08-01', cost: '255.00' },
+    { sku: 'CLO-44-INT', serial: 'EA-VC305-001', condition: 'new', status: 'available', purchaseDate: '2024-03-01', cost: '720.00' },
+
+    // Basses
+    { sku: 'BAS-34-STU', serial: 'ENG-ES1-001', condition: 'good', status: 'rented', purchaseDate: '2020-08-01', cost: '600.00', notes: 'New strings installed 2024' },
+    { sku: 'BAS-34-STU', serial: 'ENG-ES1-002', condition: 'fair', status: 'available', purchaseDate: '2019-08-01', cost: '575.00', notes: 'Repaired bass bar 2022' },
+    { sku: 'BAS-34-STU', serial: 'ENG-ES1-003', condition: 'excellent', status: 'available', purchaseDate: '2023-09-01', cost: '620.00' },
+    { sku: 'BAS-12-STU', serial: 'EA-VB80-HF-001', condition: 'good', status: 'rented', purchaseDate: '2022-08-01', cost: '510.00' },
+  ]
+
+  for (const u of unitDefs) {
+    const productId = productIds[u.sku]
+    if (!productId) continue
+    const [existing] = await sql`SELECT id FROM inventory_unit WHERE serial_number = ${u.serial}`
+    if (existing) continue
+    await sql`
+      INSERT INTO inventory_unit (product_id, serial_number, condition, status, purchase_date, purchase_cost, notes)
+      VALUES (${productId}, ${u.serial}, ${u.condition}, ${u.status}, ${u.purchaseDate}, ${u.cost}, ${u.notes ?? null})`
+    console.log(`  Unit: ${u.serial} (${u.sku}) [${u.status}]`)
+  }
+
+  // ── Price History ──────────────────────────────────────────────────────────
+  // Simulate a couple of price changes per key product over the past year
+  type PriceHistoryDef = { sku: string; previousPrice: string; newPrice: string; previousMinPrice?: string; newMinPrice?: string; daysAgo: number }
+
+  const priceHistoryDefs: PriceHistoryDef[] = [
+    // Student violins — small price increases over two cycles
+    { sku: 'VLN-44-STU', previousPrice: '379.00', newPrice: '389.00', previousMinPrice: '330.00', newMinPrice: '340.00', daysAgo: 365 },
+    { sku: 'VLN-44-STU', previousPrice: '389.00', newPrice: '399.00', previousMinPrice: '340.00', newMinPrice: '350.00', daysAgo: 180 },
+    { sku: 'VLN-34-STU', previousPrice: '329.00', newPrice: '349.00', previousMinPrice: '285.00', newMinPrice: '300.00', daysAgo: 180 },
+    { sku: 'VLN-12-STU', previousPrice: '279.00', newPrice: '299.00', previousMinPrice: '245.00', newMinPrice: '260.00', daysAgo: 180 },
+    { sku: 'VLN-14-STU', previousPrice: '229.00', newPrice: '249.00', previousMinPrice: '200.00', newMinPrice: '220.00', daysAgo: 180 },
+    // Intermediate violin — one increase
+    { sku: 'VLN-44-INT', previousPrice: '849.00', newPrice: '895.00', previousMinPrice: '759.00', newMinPrice: '800.00', daysAgo: 270 },
+    // Advanced violin — introduced at lower price, increased
+    { sku: 'VLN-44-ADV', previousPrice: '2295.00', newPrice: '2495.00', previousMinPrice: '2050.00', newMinPrice: '2200.00', daysAgo: 120 },
+    // Violas
+    { sku: 'VLA-15-STU', previousPrice: '419.00', newPrice: '449.00', previousMinPrice: '370.00', newMinPrice: '400.00', daysAgo: 200 },
+    { sku: 'VLA-16-STU', previousPrice: '419.00', newPrice: '449.00', previousMinPrice: '370.00', newMinPrice: '400.00', daysAgo: 200 },
+    { sku: 'VLA-16-INT', previousPrice: '995.00', newPrice: '1095.00', previousMinPrice: '875.00', newMinPrice: '950.00', daysAgo: 150 },
+    // Cellos
+    { sku: 'CLO-44-STU', previousPrice: '599.00', newPrice: '649.00', previousMinPrice: '535.00', newMinPrice: '580.00', daysAgo: 220 },
+    { sku: 'CLO-34-STU', previousPrice: '549.00', newPrice: '599.00', previousMinPrice: '490.00', newMinPrice: '530.00', daysAgo: 220 },
+    { sku: 'CLO-44-INT', previousPrice: '1349.00', newPrice: '1495.00', previousMinPrice: '1195.00', newMinPrice: '1300.00', daysAgo: 160 },
+    // Basses
+    { sku: 'BAS-34-STU', previousPrice: '1199.00', newPrice: '1299.00', previousMinPrice: '1075.00', newMinPrice: '1150.00', daysAgo: 240 },
+    // Strings — supplier cost increases
+    { sku: 'STR-VLN-DOM-44', previousPrice: '34.00', newPrice: '38.00', previousMinPrice: '28.00', newMinPrice: '32.00', daysAgo: 90 },
+    { sku: 'STR-CLO-LAR', previousPrice: '88.00', newPrice: '95.00', previousMinPrice: '78.00', newMinPrice: '85.00', daysAgo: 90 },
+    { sku: 'STR-BAS-HEL', previousPrice: '99.00', newPrice: '110.00', previousMinPrice: '87.00', newMinPrice: '95.00', daysAgo: 90 },
+    // Bridges — material cost increase
+    { sku: 'RPR-BRG-VLN-44', previousPrice: '15.00', newPrice: '18.00', daysAgo: 120 },
+    { sku: 'RPR-BRG-CLO', previousPrice: '28.00', newPrice: '32.00', daysAgo: 120 },
+    // Bow hair
+    { sku: 'RPR-HAIR-WH', previousPrice: '15.00', newPrice: '18.00', daysAgo: 60 },
+  ]
+
+  for (const h of priceHistoryDefs) {
+    const productId = productIds[h.sku]
+    if (!productId) continue
+    const changedAt = new Date(Date.now() - h.daysAgo * 24 * 60 * 60 * 1000).toISOString()
+    const [existing] = await sql`
+      SELECT id FROM price_history WHERE product_id = ${productId} AND new_price = ${h.newPrice} AND previous_price = ${h.previousPrice}`
+    if (existing) continue
+    await sql`
+      INSERT INTO price_history (product_id, previous_price, new_price, previous_min_price, new_min_price, created_at)
+      VALUES (${productId}, ${h.previousPrice}, ${h.newPrice}, ${h.previousMinPrice ?? null}, ${h.newMinPrice ?? null}, ${changedAt})`
+    console.log(`  Price history: ${h.sku} $${h.previousPrice} → $${h.newPrice}`)
+  }
+
+  // ── Product-Supplier Links ─────────────────────────────────────────────────
+  type SupplierLink = { sku: string; supplier: string; supplierSku?: string; isPreferred: boolean }
+
+  const supplierLinks: SupplierLink[] = [
+    // Violins — Shar preferred, Southwest alternate
+    { sku: 'VLN-44-STU', supplier: 'Shar Music', supplierSku: 'EA-VL80-44', isPreferred: true },
+    { sku: 'VLN-44-STU', supplier: 'Southwest Strings', supplierSku: 'EAST-VL80-4', isPreferred: false },
+    { sku: 'VLN-34-STU', supplier: 'Shar Music', supplierSku: 'EA-VL80-34', isPreferred: true },
+    { sku: 'VLN-34-STU', supplier: 'Southwest Strings', supplierSku: 'EAST-VL80-3', isPreferred: false },
+    { sku: 'VLN-12-STU', supplier: 'Shar Music', supplierSku: 'EA-VL80-12', isPreferred: true },
+    { sku: 'VLN-14-STU', supplier: 'Shar Music', supplierSku: 'EA-VL80-14', isPreferred: true },
+    { sku: 'VLN-44-INT', supplier: 'Shar Music', supplierSku: 'EA-VL305', isPreferred: true },
+    { sku: 'VLN-44-INT', supplier: 'Southwest Strings', supplierSku: 'EAST-VL305', isPreferred: false },
+    { sku: 'VLN-44-ADV', supplier: 'Shar Music', supplierSku: 'EA-VL605', isPreferred: true },
+    // Violas — Shar preferred, Connolly alternate
+    { sku: 'VLA-15-STU', supplier: 'Shar Music', supplierSku: 'EA-VA80-15', isPreferred: true },
+    { sku: 'VLA-15-STU', supplier: 'Connolly Music', supplierSku: 'EAST-VA80-15', isPreferred: false },
+    { sku: 'VLA-16-STU', supplier: 'Shar Music', supplierSku: 'EA-VA80-16', isPreferred: true },
+    { sku: 'VLA-16-INT', supplier: 'Shar Music', supplierSku: 'EA-VA305-16', isPreferred: true },
+    { sku: 'VLA-16-INT', supplier: 'Connolly Music', supplierSku: 'EAST-VA305', isPreferred: false },
+    // Cellos — Connolly preferred, Shar alternate
+    { sku: 'CLO-44-STU', supplier: 'Connolly Music', supplierSku: 'EAST-VC80-44', isPreferred: true },
+    { sku: 'CLO-44-STU', supplier: 'Shar Music', supplierSku: 'EA-VC80-44', isPreferred: false },
+    { sku: 'CLO-34-STU', supplier: 'Connolly Music', supplierSku: 'EAST-VC80-34', isPreferred: true },
+    { sku: 'CLO-12-STU', supplier: 'Connolly Music', supplierSku: 'EAST-VC80-12', isPreferred: true },
+    { sku: 'CLO-44-INT', supplier: 'Connolly Music', supplierSku: 'EAST-VC305', isPreferred: true },
+    { sku: 'CLO-44-INT', supplier: 'Shar Music', supplierSku: 'EA-VC305', isPreferred: false },
+    // Basses — Connolly preferred
+    { sku: 'BAS-34-STU', supplier: 'Connolly Music', supplierSku: 'ENG-ES1', isPreferred: true },
+    { sku: 'BAS-34-STU', supplier: 'Southwest Strings', supplierSku: 'ENG-ES1-SW', isPreferred: false },
+    { sku: 'BAS-12-STU', supplier: 'Connolly Music', supplierSku: 'EAST-VB80-12', isPreferred: true },
+    // Strings — D'Addario for Prelude/Helicore, Shar for Dominant, Pirastro for Larsen
+    { sku: 'STR-VLN-PRE-44', supplier: "D'Addario", supplierSku: 'J810-4/4M', isPreferred: true },
+    { sku: 'STR-VLN-DOM-44', supplier: 'Shar Music', supplierSku: 'TH-132B', isPreferred: true },
+    { sku: 'STR-VLN-DOM-34', supplier: 'Shar Music', supplierSku: 'TH-132B-34', isPreferred: true },
+    { sku: 'STR-VLA-DOM', supplier: 'Shar Music', supplierSku: 'TH-141B', isPreferred: true },
+    { sku: 'STR-CLO-PRE', supplier: "D'Addario", supplierSku: 'J1010-4/4M', isPreferred: true },
+    { sku: 'STR-CLO-LAR', supplier: 'Pirastro', supplierSku: 'LAR-SET-4', isPreferred: true },
+    { sku: 'STR-BAS-HEL', supplier: "D'Addario", supplierSku: 'J6103/4M', isPreferred: true },
+    // Rosin
+    { sku: 'RSN-HILL-L', supplier: 'Shar Music', supplierSku: 'HILL-RSN-L', isPreferred: true },
+    { sku: 'RSN-HILL-D', supplier: 'Shar Music', supplierSku: 'HILL-RSN-D', isPreferred: true },
+    { sku: 'RSN-PIR-GF', supplier: 'Pirastro', supplierSku: '900500', isPreferred: true },
+    // Bows
+    { sku: 'BOW-VLN-STU', supplier: 'Shar Music', supplierSku: 'CB-JOULE-VLN', isPreferred: true },
+    { sku: 'BOW-VLN-STU', supplier: 'Southwest Strings', supplierSku: 'CODA-JOULE-V', isPreferred: false },
+    { sku: 'BOW-VLN-CF', supplier: 'Shar Music', supplierSku: 'CB-DNX-VLN', isPreferred: true },
+    { sku: 'BOW-VLA-STU', supplier: 'Shar Music', supplierSku: 'CB-JOULE-VLA', isPreferred: true },
+    { sku: 'BOW-CLO-STU', supplier: 'Shar Music', supplierSku: 'CB-JOULE-CLO', isPreferred: true },
+    { sku: 'BOW-BAS-STU-G', supplier: 'Southwest Strings', supplierSku: 'GL-GER-BAS', isPreferred: true },
+    // Maintenance
+    { sku: 'MNT-POL-HILL', supplier: 'Shar Music', supplierSku: 'HILL-POL', isPreferred: true },
+    { sku: 'MNT-HUM-VLN', supplier: 'Shar Music', supplierSku: 'DAMP-VLN', isPreferred: true },
+    { sku: 'MNT-HUM-CLO', supplier: 'Shar Music', supplierSku: 'DAMP-CLO', isPreferred: true },
+  ]
+
+  for (const link of supplierLinks) {
+    const productId = productIds[link.sku]
+    const supplierId = supplierIds[link.supplier]
+    if (!productId || !supplierId) continue
+    const [existing] = await sql`SELECT id FROM product_supplier WHERE product_id = ${productId} AND supplier_id = ${supplierId}`
+    if (existing) continue
+    await sql`
+      INSERT INTO product_supplier (product_id, supplier_id, supplier_sku, is_preferred)
+      VALUES (${productId}, ${supplierId}, ${link.supplierSku ?? null}, ${link.isPreferred})`
+    console.log(`  Linked ${link.sku} → ${link.supplier}${link.isPreferred ? ' (preferred)' : ''}`)
+  }
+
+  // ── Stock Receipts ─────────────────────────────────────────────────────────
+  type ReceiptDef = { sku: string; supplier?: string; qty: number; costPerUnit: string; receivedDate: string; invoiceNumber?: string; notes?: string }
+
+  const receiptDefs: ReceiptDef[] = [
+    // Initial instrument purchases
+    { sku: 'VLN-44-STU', supplier: 'Shar Music',      qty: 6, costPerUnit: '185.00', receivedDate: '2022-08-01', invoiceNumber: 'SHAR-2022-0801' },
+    { sku: 'VLN-34-STU', supplier: 'Shar Music',      qty: 3, costPerUnit: '160.00', receivedDate: '2022-09-01', invoiceNumber: 'SHAR-2022-0901' },
+    { sku: 'VLN-12-STU', supplier: 'Shar Music',      qty: 2, costPerUnit: '140.00', receivedDate: '2022-09-01', invoiceNumber: 'SHAR-2022-0901' },
+    { sku: 'VLN-14-STU', supplier: 'Shar Music',      qty: 2, costPerUnit: '115.00', receivedDate: '2022-09-01', invoiceNumber: 'SHAR-2022-0901' },
+    { sku: 'VLN-44-INT', supplier: 'Shar Music',      qty: 2, costPerUnit: '420.00', receivedDate: '2023-08-01', invoiceNumber: 'SHAR-2023-0801' },
+    { sku: 'VLN-44-ADV', supplier: 'Shar Music',      qty: 1, costPerUnit: '1200.00', receivedDate: '2024-02-01', invoiceNumber: 'SHAR-2024-0201' },
+    { sku: 'VLA-15-STU', supplier: 'Shar Music',      qty: 2, costPerUnit: '210.00', receivedDate: '2022-09-01', invoiceNumber: 'SHAR-2022-0901' },
+    { sku: 'VLA-16-STU', supplier: 'Shar Music',      qty: 1, costPerUnit: '210.00', receivedDate: '2022-09-01', invoiceNumber: 'SHAR-2022-0901' },
+    { sku: 'VLA-16-INT', supplier: 'Shar Music',      qty: 1, costPerUnit: '520.00', receivedDate: '2024-01-15', invoiceNumber: 'SHAR-2024-0115' },
+    { sku: 'CLO-44-STU', supplier: 'Connolly Music',  qty: 4, costPerUnit: '300.00', receivedDate: '2021-08-01', invoiceNumber: 'CON-2021-0801' },
+    { sku: 'CLO-34-STU', supplier: 'Connolly Music',  qty: 1, costPerUnit: '275.00', receivedDate: '2022-08-01', invoiceNumber: 'CON-2022-0801' },
+    { sku: 'CLO-12-STU', supplier: 'Connolly Music',  qty: 1, costPerUnit: '255.00', receivedDate: '2023-08-01', invoiceNumber: 'CON-2023-0801' },
+    { sku: 'CLO-44-INT', supplier: 'Connolly Music',  qty: 1, costPerUnit: '720.00', receivedDate: '2024-03-01', invoiceNumber: 'CON-2024-0301' },
+    { sku: 'BAS-34-STU', supplier: 'Connolly Music',  qty: 3, costPerUnit: '595.00', receivedDate: '2019-08-01', invoiceNumber: 'CON-2019-0801' },
+    { sku: 'BAS-12-STU', supplier: 'Connolly Music',  qty: 1, costPerUnit: '510.00', receivedDate: '2022-08-01', invoiceNumber: 'CON-2022-0802' },
+    // Bow stock
+    { sku: 'BOW-VLN-STU', supplier: 'Shar Music', qty: 8,  costPerUnit: '52.00', receivedDate: '2024-01-10', invoiceNumber: 'SHAR-2024-0110' },
+    { sku: 'BOW-VLN-CF',  supplier: 'Shar Music', qty: 4,  costPerUnit: '175.00', receivedDate: '2024-01-10', invoiceNumber: 'SHAR-2024-0110' },
+    { sku: 'BOW-VLA-STU', supplier: 'Shar Music', qty: 5,  costPerUnit: '56.00', receivedDate: '2024-01-10', invoiceNumber: 'SHAR-2024-0110' },
+    { sku: 'BOW-CLO-STU', supplier: 'Shar Music', qty: 5,  costPerUnit: '65.00', receivedDate: '2024-01-10', invoiceNumber: 'SHAR-2024-0110' },
+    { sku: 'BOW-BAS-STU-G', supplier: 'Southwest Strings', qty: 4, costPerUnit: '48.00', receivedDate: '2024-02-01', invoiceNumber: 'SW-2024-0201' },
+    // String restocks
+    { sku: 'STR-VLN-DOM-44', supplier: 'Shar Music',     qty: 24, costPerUnit: '22.00', receivedDate: '2025-09-01', invoiceNumber: 'SHAR-2025-0901' },
+    { sku: 'STR-VLN-DOM-44', supplier: 'Shar Music',     qty: 12, costPerUnit: '22.50', receivedDate: '2026-01-15', invoiceNumber: 'SHAR-2026-0115' },
+    { sku: 'STR-VLN-DOM-34', supplier: 'Shar Music',     qty: 12, costPerUnit: '22.00', receivedDate: '2025-09-01', invoiceNumber: 'SHAR-2025-0901' },
+    { sku: 'STR-VLN-PRE-44', supplier: "D'Addario",      qty: 36, costPerUnit: '10.50', receivedDate: '2025-09-01', invoiceNumber: 'DAD-2025-0901' },
+    { sku: 'STR-VLN-PRE-44', supplier: "D'Addario",      qty: 24, costPerUnit: '11.00', receivedDate: '2026-02-01', invoiceNumber: 'DAD-2026-0201' },
+    { sku: 'STR-VLA-DOM',    supplier: 'Shar Music',     qty: 12, costPerUnit: '32.00', receivedDate: '2025-10-01', invoiceNumber: 'SHAR-2025-1001' },
+    { sku: 'STR-CLO-PRE',    supplier: "D'Addario",      qty: 18, costPerUnit: '22.00', receivedDate: '2025-09-01', invoiceNumber: 'DAD-2025-0901' },
+    { sku: 'STR-CLO-LAR',    supplier: 'Pirastro',       qty: 6,  costPerUnit: '58.00', receivedDate: '2025-11-01', invoiceNumber: 'PIR-2025-1101' },
+    { sku: 'STR-BAS-HEL',    supplier: "D'Addario",      qty: 10, costPerUnit: '65.00', receivedDate: '2025-09-01', invoiceNumber: 'DAD-2025-0901' },
+    // Rosin
+    { sku: 'RSN-HILL-L',  supplier: 'Shar Music', qty: 36, costPerUnit: '5.00', receivedDate: '2025-08-15', invoiceNumber: 'SHAR-2025-0815' },
+    { sku: 'RSN-HILL-D',  supplier: 'Shar Music', qty: 24, costPerUnit: '5.00', receivedDate: '2025-08-15', invoiceNumber: 'SHAR-2025-0815' },
+    { sku: 'RSN-PIR-GF',  supplier: 'Pirastro',   qty: 18, costPerUnit: '8.50', receivedDate: '2025-08-15', invoiceNumber: 'PIR-2025-0815' },
+    // Repair parts
+    { sku: 'RPR-BRG-VLN-44', supplier: 'Shar Music', qty: 12, costPerUnit: '10.00', receivedDate: '2025-07-01', invoiceNumber: 'SHAR-2025-0701' },
+    { sku: 'RPR-BRG-VLN-34', supplier: 'Shar Music', qty: 8,  costPerUnit: '9.00',  receivedDate: '2025-07-01', invoiceNumber: 'SHAR-2025-0701' },
+    { sku: 'RPR-BRG-VLA',    supplier: 'Shar Music', qty: 8,  costPerUnit: '13.00', receivedDate: '2025-07-01', invoiceNumber: 'SHAR-2025-0701' },
+    { sku: 'RPR-BRG-CLO',    supplier: 'Shar Music', qty: 6,  costPerUnit: '19.00', receivedDate: '2025-07-01', invoiceNumber: 'SHAR-2025-0701' },
+    { sku: 'RPR-BRG-BAS',    supplier: 'Shar Music', qty: 4,  costPerUnit: '29.00', receivedDate: '2025-07-01', invoiceNumber: 'SHAR-2025-0701' },
+    { sku: 'RPR-PEG-VLN-BX', supplier: 'Shar Music', qty: 15, costPerUnit: '7.00',  receivedDate: '2025-07-01', invoiceNumber: 'SHAR-2025-0701' },
+    { sku: 'RPR-PEG-VLA-BX', supplier: 'Shar Music', qty: 10, costPerUnit: '8.00',  receivedDate: '2025-07-01', invoiceNumber: 'SHAR-2025-0701' },
+    { sku: 'RPR-PEG-CLO-BX', supplier: 'Shar Music', qty: 8,  costPerUnit: '10.00', receivedDate: '2025-07-01', invoiceNumber: 'SHAR-2025-0701' },
+    { sku: 'RPR-HAIR-WH',    supplier: 'Shar Music', qty: 12, costPerUnit: '11.00', receivedDate: '2025-10-01', invoiceNumber: 'SHAR-2025-1001' },
+    { sku: 'RPR-TLP-VLN-44', supplier: 'Shar Music', qty: 10, costPerUnit: '8.50',  receivedDate: '2025-09-15', invoiceNumber: 'SHAR-2025-0915' },
+    { sku: 'RPR-GLU-HIDE',   supplier: 'Shar Music', qty: 8,  costPerUnit: '4.50',  receivedDate: '2025-09-15', invoiceNumber: 'SHAR-2025-0915' },
+    { sku: 'RPR-POL-HILL',   supplier: 'Shar Music', qty: 18, costPerUnit: '6.00',  receivedDate: '2025-09-15', invoiceNumber: 'SHAR-2025-0915', notes: 'SKU changed from MNT-POL-HILL' },
+    { sku: 'MNT-POL-HILL',   supplier: 'Shar Music', qty: 18, costPerUnit: '6.00',  receivedDate: '2025-09-15', invoiceNumber: 'SHAR-2025-0915' },
+    { sku: 'RPR-PEG-DOC',    supplier: 'Shar Music', qty: 15, costPerUnit: '3.50',  receivedDate: '2025-09-15', invoiceNumber: 'SHAR-2025-0915' },
+    // Shoulder rests
+    { sku: 'SR-KUN-44', supplier: 'Shar Music', qty: 12, costPerUnit: '17.00', receivedDate: '2025-08-01', invoiceNumber: 'SHAR-2025-0801' },
+    { sku: 'SR-KUN-C',  supplier: 'Shar Music', qty: 8,  costPerUnit: '21.00', receivedDate: '2025-08-01', invoiceNumber: 'SHAR-2025-0801' },
+    { sku: 'SR-BON-44', supplier: 'Shar Music', qty: 6,  costPerUnit: '26.00', receivedDate: '2025-08-01', invoiceNumber: 'SHAR-2025-0801' },
+  ]
+
+  for (const r of receiptDefs) {
+    const productId = productIds[r.sku]
+    const supplierId = r.supplier ? supplierIds[r.supplier] : null
+    if (!productId) continue
+    const [existing] = await sql`
+      SELECT id FROM stock_receipt WHERE product_id = ${productId} AND received_date = ${r.receivedDate} AND cost_per_unit = ${r.costPerUnit} AND qty = ${r.qty}`
+    if (existing) continue
+    const totalCost = (parseFloat(r.costPerUnit) * r.qty).toFixed(2)
+    await sql`
+      INSERT INTO stock_receipt (product_id, supplier_id, qty, cost_per_unit, total_cost, received_date, invoice_number, notes)
+      VALUES (${productId}, ${supplierId ?? null}, ${r.qty}, ${r.costPerUnit}, ${totalCost}, ${r.receivedDate}, ${r.invoiceNumber ?? null}, ${r.notes ?? null})`
+    console.log(`  Receipt: ${r.sku} qty=${r.qty} @ $${r.costPerUnit}`)
+  }
+
+  console.log('  Inventory seed complete.')
+}
+
 // Returns dates (YYYY-MM-DD) for every occurrence of `dayOfWeek` (0=Sun)
 // starting from `startDate`, for `count` weeks.
 function weeklyDates(startDate: string, dayOfWeek: number, count: number): string[] {
@@ -188,6 +965,21 @@ function weeklyDates(startDate: string, dayOfWeek: number, count: number): strin
 async function seedLessons(sql: any) {
   console.log('\nSeeding lessons data...')
 
+  // ── Clear old non-string lesson data ──────────────────────────────────────
+  // Delete in dependency order so FK constraints don't block
+  await sql`DELETE FROM lesson_plan_item`
+  await sql`DELETE FROM lesson_plan_section`
+  await sql`DELETE FROM member_lesson_plan`
+  await sql`DELETE FROM lesson_plan_template_item`
+  await sql`DELETE FROM lesson_plan_template_section`
+  await sql`DELETE FROM lesson_plan_template`
+  await sql`DELETE FROM lesson_session`
+  await sql`DELETE FROM enrollment`
+  await sql`DELETE FROM schedule_slot`
+  await sql`DELETE FROM lesson_type`
+  await sql`DELETE FROM instructor`
+  console.log('  Cleared old lesson data')
+
   // ── Grading scale ──────────────────────────────────────────────────────────
   const [existingScale] = await sql`SELECT id FROM grading_scale WHERE name = 'Standard Progress'`
   let scaleId: string
@@ -216,18 +1008,18 @@ async function seedLessons(sql: any) {
   const instructorDefs = [
     {
       displayName: 'Sarah Mitchell',
-      bio: 'Classical piano and violin instructor with 12 years of teaching experience. Suzuki-certified for violin.',
-      instruments: ['Piano', 'Violin'],
+      bio: 'Violin and viola instructor with 12 years of teaching experience. Suzuki-certified through Book 6. Member of the City Symphony Orchestra.',
+      instruments: ['Violin', 'Viola'],
     },
     {
-      displayName: 'Marcus Webb',
-      bio: 'Guitarist and bassist specializing in rock, blues, and jazz. 8 years of studio and teaching experience.',
-      instruments: ['Guitar', 'Bass'],
+      displayName: 'James Carter',
+      bio: 'Cellist and chamber musician with a masters in performance from Eastman School of Music. Teaches all levels from beginner through pre-college.',
+      instruments: ['Cello'],
     },
     {
-      displayName: 'Diana Reyes',
-      bio: 'Woodwind specialist with a music education degree. Teaches saxophone, clarinet, and flute at all levels.',
-      instruments: ['Saxophone', 'Clarinet', 'Flute'],
+      displayName: 'Beth Romero',
+      bio: 'Double bassist with 10 years of orchestral and jazz experience. Former section principal. Warm, patient teaching style for all ages.',
+      instruments: ['Bass'],
     },
   ]
 
@@ -245,12 +1037,13 @@ async function seedLessons(sql: any) {
 
   // ── Lesson types ───────────────────────────────────────────────────────────
   const lessonTypeDefs = [
-    { name: '30-min Private Piano',   instrument: 'Piano',  durationMinutes: 30, lessonFormat: 'private', rateWeekly: '35.00', rateMonthly: '120.00', rateQuarterly: '330.00' },
-    { name: '45-min Private Piano',   instrument: 'Piano',  durationMinutes: 45, lessonFormat: 'private', rateWeekly: '50.00', rateMonthly: '175.00', rateQuarterly: '480.00' },
-    { name: '30-min Private Guitar',  instrument: 'Guitar', durationMinutes: 30, lessonFormat: 'private', rateWeekly: '35.00', rateMonthly: '120.00', rateQuarterly: '330.00' },
     { name: '30-min Private Violin',  instrument: 'Violin', durationMinutes: 30, lessonFormat: 'private', rateWeekly: '35.00', rateMonthly: '120.00', rateQuarterly: '330.00' },
-    { name: '30-min Private Woodwind',instrument: null,     durationMinutes: 30, lessonFormat: 'private', rateWeekly: '35.00', rateMonthly: '120.00', rateQuarterly: '330.00' },
-    { name: '45-min Group Guitar',    instrument: 'Guitar', durationMinutes: 45, lessonFormat: 'group',   rateWeekly: null,    rateMonthly: '75.00',  rateQuarterly: '200.00' },
+    { name: '45-min Private Violin',  instrument: 'Violin', durationMinutes: 45, lessonFormat: 'private', rateWeekly: '50.00', rateMonthly: '175.00', rateQuarterly: '480.00' },
+    { name: '30-min Private Viola',   instrument: 'Viola',  durationMinutes: 30, lessonFormat: 'private', rateWeekly: '35.00', rateMonthly: '120.00', rateQuarterly: '330.00' },
+    { name: '30-min Private Cello',   instrument: 'Cello',  durationMinutes: 30, lessonFormat: 'private', rateWeekly: '35.00', rateMonthly: '120.00', rateQuarterly: '330.00' },
+    { name: '45-min Private Cello',   instrument: 'Cello',  durationMinutes: 45, lessonFormat: 'private', rateWeekly: '50.00', rateMonthly: '175.00', rateQuarterly: '480.00' },
+    { name: '30-min Private Bass',    instrument: 'Bass',   durationMinutes: 30, lessonFormat: 'private', rateWeekly: '35.00', rateMonthly: '120.00', rateQuarterly: '330.00' },
+    { name: '60-min String Ensemble', instrument: null,     durationMinutes: 60, lessonFormat: 'group',   rateWeekly: null,    rateMonthly: '65.00',  rateQuarterly: '180.00' },
   ]
 
   const ltIds: Record<string, string> = {}
@@ -268,21 +1061,24 @@ async function seedLessons(sql: any) {
   // ── Schedule slots ─────────────────────────────────────────────────────────
   // dayOfWeek: 0=Sun, 1=Mon, 2=Tue, 3=Wed, 4=Thu, 5=Fri, 6=Sat
   const slotDefs = [
-    // Sarah Mitchell — Piano & Violin
-    { key: 'sarah_mon_1530_piano30',  instructor: 'Sarah Mitchell', lessonType: '30-min Private Piano',  dayOfWeek: 1, startTime: '15:30', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
-    { key: 'sarah_mon_1600_piano30',  instructor: 'Sarah Mitchell', lessonType: '30-min Private Piano',  dayOfWeek: 1, startTime: '16:00', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
-    { key: 'sarah_mon_1700_piano45',  instructor: 'Sarah Mitchell', lessonType: '45-min Private Piano',  dayOfWeek: 1, startTime: '17:00', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
-    { key: 'sarah_wed_1530_violin',   instructor: 'Sarah Mitchell', lessonType: '30-min Private Violin', dayOfWeek: 3, startTime: '15:30', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
-    { key: 'sarah_wed_1600_violin',   instructor: 'Sarah Mitchell', lessonType: '30-min Private Violin', dayOfWeek: 3, startTime: '16:00', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
-    // Marcus Webb — Guitar (rate override: $115/mo, $400/qtr — slightly above default for experienced instructor)
-    { key: 'marcus_tue_1500_guitar',  instructor: 'Marcus Webb',    lessonType: '30-min Private Guitar', dayOfWeek: 2, startTime: '15:00', room: 'Studio 2', maxStudents: 1, rateMonthly: '115.00' },
-    { key: 'marcus_tue_1600_guitar',  instructor: 'Marcus Webb',    lessonType: '30-min Private Guitar', dayOfWeek: 2, startTime: '16:00', room: 'Studio 2', maxStudents: 1, rateMonthly: '115.00' },
-    { key: 'marcus_thu_1600_group',   instructor: 'Marcus Webb',    lessonType: '45-min Group Guitar',   dayOfWeek: 4, startTime: '16:00', room: 'Studio 2', maxStudents: 5, rateMonthly: null },
-    { key: 'marcus_sat_1000_guitar',  instructor: 'Marcus Webb',    lessonType: '30-min Private Guitar', dayOfWeek: 6, startTime: '10:00', room: 'Studio 2', maxStudents: 1, rateMonthly: '115.00' },
-    // Diana Reyes — Woodwind
-    { key: 'diana_mon_1630_woodwind', instructor: 'Diana Reyes',    lessonType: '30-min Private Woodwind', dayOfWeek: 1, startTime: '16:30', room: 'Studio 3', maxStudents: 1, rateMonthly: null },
-    { key: 'diana_wed_1500_woodwind', instructor: 'Diana Reyes',    lessonType: '30-min Private Woodwind', dayOfWeek: 3, startTime: '15:00', room: 'Studio 3', maxStudents: 1, rateMonthly: null },
-    { key: 'diana_fri_1600_woodwind', instructor: 'Diana Reyes',    lessonType: '30-min Private Woodwind', dayOfWeek: 5, startTime: '16:00', room: 'Studio 3', maxStudents: 1, rateMonthly: null },
+    // Sarah Mitchell — Violin & Viola
+    { key: 'sarah_mon_1530_vln30',  instructor: 'Sarah Mitchell', lessonType: '30-min Private Violin', dayOfWeek: 1, startTime: '15:30', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
+    { key: 'sarah_mon_1600_vln30',  instructor: 'Sarah Mitchell', lessonType: '30-min Private Violin', dayOfWeek: 1, startTime: '16:00', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
+    { key: 'sarah_wed_1530_vln30',  instructor: 'Sarah Mitchell', lessonType: '30-min Private Violin', dayOfWeek: 3, startTime: '15:30', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
+    { key: 'sarah_wed_1600_vln45',  instructor: 'Sarah Mitchell', lessonType: '45-min Private Violin', dayOfWeek: 3, startTime: '16:00', room: 'Studio 1', maxStudents: 1, rateMonthly: '155.00' },
+    { key: 'sarah_fri_1600_vla30',  instructor: 'Sarah Mitchell', lessonType: '30-min Private Viola',  dayOfWeek: 5, startTime: '16:00', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
+    { key: 'sarah_sat_1000_vln30',  instructor: 'Sarah Mitchell', lessonType: '30-min Private Violin', dayOfWeek: 6, startTime: '10:00', room: 'Studio 1', maxStudents: 1, rateMonthly: null },
+    // James Carter — Cello
+    { key: 'james_tue_1500_clo30',  instructor: 'James Carter',   lessonType: '30-min Private Cello',  dayOfWeek: 2, startTime: '15:00', room: 'Studio 2', maxStudents: 1, rateMonthly: null },
+    { key: 'james_tue_1600_clo30',  instructor: 'James Carter',   lessonType: '30-min Private Cello',  dayOfWeek: 2, startTime: '16:00', room: 'Studio 2', maxStudents: 1, rateMonthly: null },
+    { key: 'james_thu_1530_clo45',  instructor: 'James Carter',   lessonType: '45-min Private Cello',  dayOfWeek: 4, startTime: '15:30', room: 'Studio 2', maxStudents: 1, rateMonthly: '155.00' },
+    { key: 'james_sat_1000_clo30',  instructor: 'James Carter',   lessonType: '30-min Private Cello',  dayOfWeek: 6, startTime: '10:00', room: 'Studio 2', maxStudents: 1, rateMonthly: null },
+    // Beth Romero — Bass
+    { key: 'beth_wed_1700_bas30',   instructor: 'Beth Romero',    lessonType: '30-min Private Bass',   dayOfWeek: 3, startTime: '17:00', room: 'Studio 3', maxStudents: 1, rateMonthly: null },
+    { key: 'beth_fri_1500_bas30',   instructor: 'Beth Romero',    lessonType: '30-min Private Bass',   dayOfWeek: 5, startTime: '15:00', room: 'Studio 3', maxStudents: 1, rateMonthly: null },
+    { key: 'beth_sat_1100_bas30',   instructor: 'Beth Romero',    lessonType: '30-min Private Bass',   dayOfWeek: 6, startTime: '11:00', room: 'Studio 3', maxStudents: 1, rateMonthly: null },
+    // String Ensemble — Saturdays (all three instructors rotate supervision; assign to Sarah)
+    { key: 'ensemble_sat_1300',     instructor: 'Sarah Mitchell', lessonType: '60-min String Ensemble', dayOfWeek: 6, startTime: '13:00', room: 'Main Hall', maxStudents: 12, rateMonthly: null },
   ]
 
   const slotIds: Record<string, string> = {}
@@ -307,32 +1103,31 @@ async function seedLessons(sql: any) {
   for (const m of memberRows) memberMap[`${m.first_name} ${m.last_name}`] = { id: m.id, accountId: m.account_id }
 
   // ── Enrollments ────────────────────────────────────────────────────────────
-  // Each entry: member, slot key, start date (must match slot's day of week), rate, billingInterval, billingUnit
   const enrollmentDefs = [
     {
-      member: 'Tommy Smith',   slotKey: 'sarah_mon_1530_piano30',  startDate: '2026-01-05',
+      member: 'Tommy Smith',   slotKey: 'sarah_mon_1530_vln30', startDate: '2026-01-05',
       rate: '120.00', billingInterval: 1, billingUnit: 'month',
-      notes: 'Tommy is 8 years old, complete beginner. Parents prefer Monday after school.',
+      notes: 'Tommy is 8 years old, complete beginner. Using a 1/2 size rental. Parents prefer Monday after school.',
     },
     {
-      member: 'Jake Johnson',  slotKey: 'sarah_wed_1530_violin',   startDate: '2026-01-07',
+      member: 'Jake Johnson',  slotKey: 'sarah_wed_1530_vln30', startDate: '2026-01-07',
       rate: '120.00', billingInterval: 1, billingUnit: 'month',
-      notes: 'Jake (age 10) started Suzuki Book 1 last year at his school program.',
+      notes: 'Jake (age 10) started Suzuki Book 1 at school. Moving to Book 2. Uses a 3/4 rental.',
     },
     {
-      member: 'Emily Chen',    slotKey: 'marcus_tue_1500_guitar',  startDate: '2026-01-06',
-      rate: '115.00', billingInterval: 1, billingUnit: 'month',
-      notes: 'Emily plays some chords already — looking to improve technique and learn to read music.',
-    },
-    {
-      member: 'Mike Thompson', slotKey: 'marcus_sat_1000_guitar',  startDate: '2026-02-07',
-      rate: '115.00', billingInterval: 1, billingUnit: 'month',
-      notes: 'Mike is an adult beginner. Prefers Saturday mornings.',
-    },
-    {
-      member: 'Carlos Garcia', slotKey: 'diana_fri_1600_woodwind', startDate: '2026-01-09',
+      member: 'Emily Chen',    slotKey: 'sarah_fri_1600_vla30', startDate: '2026-01-09',
       rate: '120.00', billingInterval: 1, billingUnit: 'month',
-      notes: 'Carlos plays alto sax — returning student after a 2-year break.',
+      notes: 'Emily played violin through high school, now switching to viola. Strong reader, working on tone and shifting.',
+    },
+    {
+      member: 'Mike Thompson', slotKey: 'james_sat_1000_clo30', startDate: '2026-02-01',
+      rate: '120.00', billingInterval: 1, billingUnit: 'month',
+      notes: 'Mike is an adult beginner on cello. Very motivated. Renting a full-size cello.',
+    },
+    {
+      member: 'Carlos Garcia', slotKey: 'beth_fri_1500_bas30', startDate: '2026-01-09',
+      rate: '120.00', billingInterval: 1, billingUnit: 'month',
+      notes: 'Carlos played bass in high school orchestra. Returning student — solid fundamentals, working on thumb position.',
     },
   ]
 
@@ -357,37 +1152,26 @@ async function seedLessons(sql: any) {
   }
 
   // ── Lesson sessions ────────────────────────────────────────────────────────
-  // Generate past sessions (attended/missed) and a few upcoming (scheduled)
-  // Format: [date, status, instructorNotes?]
   type SessionEntry = [string, string, string?]
-
-  interface SessionSet {
-    enrollmentKey: string
-    slotKey: string
-    entries: SessionEntry[]
-  }
-
-  const today = '2026-03-30'
+  interface SessionSet { enrollmentKey: string; slotKey: string; entries: SessionEntry[] }
 
   const sessionSets: SessionSet[] = [
     {
       enrollmentKey: 'Tommy Smith',
-      slotKey: 'sarah_mon_1530_piano30',
+      slotKey: 'sarah_mon_1530_vln30',
       entries: [
-        // Past sessions — Monday 15:30
-        ['2026-01-05', 'attended'],
+        ['2026-01-05', 'attended', 'First lesson. Introduced bow hold and open string bowing. Tommy is enthusiastic!'],
         ['2026-01-12', 'attended'],
-        ['2026-01-19', 'attended', 'Great progress on Clair de Lune beginner arrangement. Hand position improving.'],
+        ['2026-01-19', 'attended', 'Bow arm improving. Introduced left hand finger placement — E and A strings.'],
         ['2026-01-26', 'missed'],
         ['2026-02-02', 'attended'],
-        ['2026-02-09', 'attended', 'Worked on legato technique. Introduced bass clef reading.'],
+        ['2026-02-09', 'attended', 'Playing Twinkle Variation A slowly with good intonation. Bow hold still needs reminders.'],
         ['2026-02-16', 'attended'],
         ['2026-02-23', 'attended'],
-        ['2026-03-02', 'attended', 'Tommy played "Ode to Joy" hands together for the first time — great milestone!'],
+        ['2026-03-02', 'attended', 'Tommy played Twinkle Theme hands-down with confidence — great milestone!'],
         ['2026-03-09', 'attended'],
-        ['2026-03-16', 'attended', 'Focusing on dynamics this month. Tommy responds well to storytelling analogies.'],
+        ['2026-03-16', 'attended', 'Introduced Lightly Row. Working on smooth bow changes.'],
         ['2026-03-23', 'attended'],
-        // Upcoming
         ['2026-03-30', 'scheduled'],
         ['2026-04-06', 'scheduled'],
         ['2026-04-13', 'scheduled'],
@@ -395,19 +1179,19 @@ async function seedLessons(sql: any) {
     },
     {
       enrollmentKey: 'Jake Johnson',
-      slotKey: 'sarah_wed_1530_violin',
+      slotKey: 'sarah_wed_1530_vln30',
       entries: [
-        ['2026-01-07', 'attended'],
+        ['2026-01-07', 'attended', 'Assessment: solid Book 1 foundation. Starting Book 2 — Chorus from Judas Maccabeus.'],
         ['2026-01-14', 'attended'],
-        ['2026-01-21', 'attended', 'Jake shifted to Suzuki Book 1 Track 4. Bow hold still needs work.'],
+        ['2026-01-21', 'attended', 'Shifting to 3rd position introduced. Intonation on D string needs focus.'],
         ['2026-01-28', 'attended'],
         ['2026-02-04', 'missed'],
-        ['2026-02-11', 'attended', 'Good session — bow hold much improved. Started Perpetual Motion.'],
+        ['2026-02-11', 'attended', 'Third position becoming more reliable. Vibrato exercises started.'],
         ['2026-02-18', 'attended'],
         ['2026-02-25', 'attended'],
-        ['2026-03-04', 'attended', 'Perpetual Motion up to speed. Introduced Allegretto.'],
+        ['2026-03-04', 'attended', 'Chorus from Judas Maccabeus up to performance tempo. Vibrato emerging nicely.'],
         ['2026-03-11', 'attended'],
-        ['2026-03-18', 'attended', 'Jake performed Twinkle Variation A at slow tempo very cleanly.'],
+        ['2026-03-18', 'attended', 'Jake performed the Chorus at slow recital tempo — very clean. Starting Hunters\' Chorus.'],
         ['2026-03-25', 'attended'],
         ['2026-04-01', 'scheduled'],
         ['2026-04-08', 'scheduled'],
@@ -416,58 +1200,59 @@ async function seedLessons(sql: any) {
     },
     {
       enrollmentKey: 'Emily Chen',
-      slotKey: 'marcus_tue_1500_guitar',
+      slotKey: 'sarah_fri_1600_vla30',
       entries: [
-        ['2026-01-06', 'attended'],
-        ['2026-01-13', 'attended', 'Emily knows open chords (G, C, D, Em, Am). Introduced barre chords.'],
-        ['2026-01-20', 'attended'],
-        ['2026-01-27', 'attended', 'F barre chord coming along. Introduced power chords and palm muting.'],
-        ['2026-02-03', 'attended'],
-        ['2026-02-10', 'attended', 'Working through major scale patterns. Emily picks things up fast.'],
-        ['2026-02-17', 'missed'],
-        ['2026-02-24', 'attended'],
-        ['2026-03-03', 'attended', 'Started pentatonic minor scale. Playing along to simple backing track.'],
-        ['2026-03-10', 'attended'],
-        ['2026-03-17', 'attended', 'Emily improvised a 4-bar phrase over a blues backing — sounded great!'],
-        ['2026-03-24', 'attended'],
-        ['2026-03-31', 'scheduled'],
-        ['2026-04-07', 'scheduled'],
-        ['2026-04-14', 'scheduled'],
+        ['2026-01-09', 'attended', 'Assessment: violin background is strong. Adjusted chin rest and shoulder rest for viola. Alto clef introduced.'],
+        ['2026-01-16', 'attended'],
+        ['2026-01-23', 'attended', 'Alto clef reading improving quickly. Tone production on C string needs work — bowing angle adjustment.'],
+        ['2026-01-30', 'attended'],
+        ['2026-02-06', 'attended', 'Significantly richer tone on low strings. Started Telemann Viola Concerto in G major, 1st mvt.'],
+        ['2026-02-13', 'attended'],
+        ['2026-02-20', 'missed'],
+        ['2026-02-27', 'attended'],
+        ['2026-03-06', 'attended', 'Telemann 1st movement up to tempo. Emily\'s vibrato really coming through on viola — beautiful sound.'],
+        ['2026-03-13', 'attended'],
+        ['2026-03-20', 'attended', 'Starting 2nd movement. Discussing potential solo performance at spring recital.'],
+        ['2026-03-27', 'attended'],
+        ['2026-04-03', 'scheduled'],
+        ['2026-04-10', 'scheduled'],
+        ['2026-04-17', 'scheduled'],
       ],
     },
     {
       enrollmentKey: 'Mike Thompson',
-      slotKey: 'marcus_sat_1000_guitar',
+      slotKey: 'james_sat_1000_clo30',
       entries: [
-        ['2026-02-07', 'attended', 'First lesson — covered proper posture, right/left hand basics, and open E and A strings.'],
-        ['2026-02-14', 'attended'],
-        ['2026-02-21', 'attended', 'Introduced G, C, Em chords. Switching between G and Em getting smoother.'],
-        ['2026-02-28', 'attended'],
-        ['2026-03-07', 'attended', 'Added D chord. Working on "Knockin\' on Heaven\'s Door" intro pattern.'],
-        ['2026-03-14', 'attended'],
-        ['2026-03-21', 'attended', 'Mike played the intro riff cleanly at tempo. Really motivated student.'],
-        ['2026-03-28', 'attended'],
-        ['2026-04-04', 'scheduled'],
-        ['2026-04-11', 'scheduled'],
-        ['2026-04-18', 'scheduled'],
+        ['2026-02-01', 'attended', 'First lesson — proper sitting posture, bow hold, open string bowing. Mike is a quick learner.'],
+        ['2026-02-08', 'attended'],
+        ['2026-02-15', 'attended', 'Left hand frame introduced. Thumb position on neck. Playing first simple melodies.'],
+        ['2026-02-22', 'attended'],
+        ['2026-03-01', 'attended', 'Bass clef reading going well. Playing "Lightly Row" in D major. Intonation on A string improving.'],
+        ['2026-03-08', 'attended'],
+        ['2026-03-15', 'attended', 'Mike nailed the first cello piece from Mooney\'s "Position Pieces." Really motivated — practices daily.'],
+        ['2026-03-22', 'attended'],
+        ['2026-03-29', 'attended', 'Starting Suzuki Cello Book 1 formally. Tone on D and A strings sounding great.'],
+        ['2026-04-05', 'scheduled'],
+        ['2026-04-12', 'scheduled'],
+        ['2026-04-19', 'scheduled'],
       ],
     },
     {
       enrollmentKey: 'Carlos Garcia',
-      slotKey: 'diana_fri_1600_woodwind',
+      slotKey: 'beth_fri_1500_bas30',
       entries: [
-        ['2026-01-09', 'attended', 'Assessment session — Carlos retained most of his fundamentals. Some embouchure drift after the break.'],
+        ['2026-01-09', 'attended', 'Assessment — Carlos has solid orchestra foundation. Reviewing shifting, extensions, and bow distribution.'],
         ['2026-01-16', 'attended'],
-        ['2026-01-23', 'attended', 'Back up to speed on low register. Working on altissimo range.'],
+        ['2026-01-23', 'attended', 'Thumb position work started. Carlos adapting well — good ear for intonation.'],
         ['2026-01-30', 'attended'],
-        ['2026-02-06', 'attended', 'Started working through Charlie Parker\'s "Billie\'s Bounce" head at half tempo.'],
+        ['2026-02-06', 'attended', 'Working through Simandl Book 1 exercises in thumb position. Stamina building.'],
         ['2026-02-13', 'attended'],
-        ['2026-02-20', 'attended', 'Tone in the upper register sounding much stronger. Vibrato control improving.'],
+        ['2026-02-20', 'attended', 'Thumb position solid up to 4th. Starting to work on Dragonetti Concerto opening.'],
         ['2026-02-27', 'attended'],
-        ['2026-03-06', 'attended', '"Billie\'s Bounce" head now solid at tempo. Moving to comping rhythms.'],
+        ['2026-03-06', 'attended', 'Dragonetti opening phrase sounding musical. Bow arm and tone in upper positions much improved.'],
         ['2026-03-13', 'missed'],
         ['2026-03-20', 'attended'],
-        ['2026-03-27', 'attended', 'Carlos brought in his own transcription of a Cannonball Adderley lick — great initiative.'],
+        ['2026-03-27', 'attended', 'Carlos brought in a jazz bassline he transcribed from Ray Brown — spent half the lesson on groove and feel. Excellent initiative.'],
         ['2026-04-03', 'scheduled'],
         ['2026-04-10', 'scheduled'],
         ['2026-04-17', 'scheduled'],
@@ -494,62 +1279,69 @@ async function seedLessons(sql: any) {
           ${instructorNotes && status !== 'scheduled' ? new Date(date + 'T20:00:00Z').toISOString() : null}
         )`
     }
-    const count = ss.entries.length
-    console.log(`  Sessions: ${ss.enrollmentKey} (${count})`)
+    console.log(`  Sessions: ${ss.enrollmentKey} (${ss.entries.length})`)
   }
 
-  // ── Lesson plan template — Beginner Piano Fundamentals ─────────────────────
-  const [existingTemplate] = await sql`SELECT id FROM lesson_plan_template WHERE name = 'Beginner Piano Fundamentals'`
+  // ── Lesson plan template — Beginner Violin (Suzuki Book 1) ─────────────────
+  const [existingTemplate] = await sql`SELECT id FROM lesson_plan_template WHERE name = 'Beginner Violin — Suzuki Book 1'`
   if (!existingTemplate) {
     const [tmpl] = await sql`
       INSERT INTO lesson_plan_template (name, description, instrument, skill_level, is_active)
       VALUES (
-        'Beginner Piano Fundamentals',
-        'Core skills for students in their first year of piano study — from posture and note reading through first hands-together pieces.',
-        'Piano', 'beginner', true
+        'Beginner Violin — Suzuki Book 1',
+        'Core skills for first-year violin students following the Suzuki method — from bow hold and posture through the full Book 1 repertoire.',
+        'Violin', 'beginner', true
       ) RETURNING id`
 
     const sections = [
       {
-        title: 'Posture & Hand Position',
+        title: 'Posture & Setup',
         sortOrder: 0,
         items: [
-          { title: 'Bench height and sitting posture', sortOrder: 0 },
-          { title: 'Hand arch and curved fingers',     sortOrder: 1 },
-          { title: 'Finger numbering (1–5)',            sortOrder: 2 },
-          { title: 'Relaxed wrists and forearms',       sortOrder: 3 },
+          { title: 'Proper standing/sitting posture', sortOrder: 0 },
+          { title: 'Violin hold and chin rest position', sortOrder: 1 },
+          { title: 'Shoulder rest adjustment', sortOrder: 2 },
+          { title: 'Bow hold (Suzuki style)', sortOrder: 3 },
+          { title: 'Relaxed arm weight into string', sortOrder: 4 },
         ],
       },
       {
-        title: 'Reading Music',
+        title: 'Bowing Technique',
         sortOrder: 1,
         items: [
-          { title: 'Treble clef note names (C4–G5)',    sortOrder: 0 },
-          { title: 'Bass clef note names (C3–G4)',      sortOrder: 1 },
-          { title: 'Note values: whole, half, quarter', sortOrder: 2 },
-          { title: 'Time signatures: 4/4 and 3/4',      sortOrder: 3 },
-          { title: 'Bar lines and repeats',              sortOrder: 4 },
+          { title: 'Open string bowing — all four strings', sortOrder: 0 },
+          { title: 'Straight bow path', sortOrder: 1 },
+          { title: 'Smooth bow changes at frog and tip', sortOrder: 2 },
+          { title: 'Detaché stroke', sortOrder: 3 },
+          { title: 'Staccato introduction', sortOrder: 4 },
         ],
       },
       {
-        title: 'Keyboard Geography',
+        title: 'Left Hand & Intonation',
         sortOrder: 2,
         items: [
-          { title: 'All white key names across full keyboard', sortOrder: 0 },
-          { title: 'Black key groups (2s and 3s)',             sortOrder: 1 },
-          { title: 'Middle C and octave identification',       sortOrder: 2 },
+          { title: 'Finger placement — E and A strings', sortOrder: 0 },
+          { title: 'Finger placement — D and G strings', sortOrder: 1 },
+          { title: 'First finger frame', sortOrder: 2 },
+          { title: 'Low 2nd finger (B♭, E♭)', sortOrder: 3 },
+          { title: 'High 3rd finger', sortOrder: 4 },
         ],
       },
       {
-        title: 'First Pieces',
+        title: 'Suzuki Book 1 Repertoire',
         sortOrder: 3,
         items: [
-          { title: 'Five-finger melody (right hand only)',     sortOrder: 0 },
-          { title: 'Simple left hand accompaniment',           sortOrder: 1 },
-          { title: 'Hands together at slow tempo',             sortOrder: 2 },
-          { title: 'Mary Had a Little Lamb',                   sortOrder: 3 },
-          { title: 'Ode to Joy (Beethoven)',                   sortOrder: 4 },
-          { title: 'Merrily We Roll Along',                    sortOrder: 5 },
+          { title: 'Twinkle Twinkle — Variation A', sortOrder: 0 },
+          { title: 'Twinkle Twinkle — Theme', sortOrder: 1 },
+          { title: 'Lightly Row', sortOrder: 2 },
+          { title: 'Song of the Wind', sortOrder: 3 },
+          { title: 'Go Tell Aunt Rhody', sortOrder: 4 },
+          { title: 'O Come Little Children', sortOrder: 5 },
+          { title: 'May Song', sortOrder: 6 },
+          { title: 'Long, Long Ago', sortOrder: 7 },
+          { title: 'Allegro (Suzuki)', sortOrder: 8 },
+          { title: 'Perpetual Motion', sortOrder: 9 },
+          { title: 'Allegretto (Suzuki)', sortOrder: 10 },
         ],
       },
     ]
@@ -565,10 +1357,10 @@ async function seedLessons(sql: any) {
           VALUES (${s.id}, ${item.title}, ${scaleId}, ${item.sortOrder})`
       }
     }
-    console.log('  Template: Beginner Piano Fundamentals')
+    console.log('  Template: Beginner Violin — Suzuki Book 1')
   }
 
-  // ── Lesson plan for Tommy Smith ────────────────────────────────────────────
+  // ── Lesson plan for Tommy Smith (violin beginner) ──────────────────────────
   const tommyEnrollmentId = enrollmentIds['Tommy Smith']
   const tommyMember = memberMap['Tommy Smith']
   if (tommyEnrollmentId && tommyMember) {
@@ -576,58 +1368,46 @@ async function seedLessons(sql: any) {
     if (!existingPlan) {
       const [plan] = await sql`
         INSERT INTO member_lesson_plan (member_id, enrollment_id, title, description, is_active, started_date)
-        VALUES (${tommyMember.id}, ${tommyEnrollmentId}, 'Piano Fundamentals — Tommy Smith', 'Working through first-year piano curriculum.', true, '2026-01-05')
+        VALUES (${tommyMember.id}, ${tommyEnrollmentId}, 'Violin Suzuki Book 1 — Tommy Smith', 'Working through Suzuki Book 1.', true, '2026-01-05')
         RETURNING id`
 
-      // Section 1 — Posture: all mastered
-      const [sec1] = await sql`
-        INSERT INTO lesson_plan_section (lesson_plan_id, title, sort_order)
-        VALUES (${plan.id}, 'Posture & Hand Position', 0) RETURNING id`
-      const posturItems = [
-        { title: 'Bench height and sitting posture',  status: 'mastered',     sortOrder: 0 },
-        { title: 'Hand arch and curved fingers',      status: 'mastered',     sortOrder: 1 },
-        { title: 'Finger numbering (1–5)',             status: 'mastered',     sortOrder: 2 },
-        { title: 'Relaxed wrists and forearms',        status: 'in_progress',  sortOrder: 3 },
-      ]
-      for (const it of posturItems) {
+      const [sec1] = await sql`INSERT INTO lesson_plan_section (lesson_plan_id, title, sort_order) VALUES (${plan.id}, 'Posture & Setup', 0) RETURNING id`
+      for (const it of [
+        { title: 'Proper standing/sitting posture',     status: 'mastered',    sortOrder: 0 },
+        { title: 'Violin hold and chin rest position',  status: 'mastered',    sortOrder: 1 },
+        { title: 'Shoulder rest adjustment',            status: 'mastered',    sortOrder: 2 },
+        { title: 'Bow hold (Suzuki style)',              status: 'in_progress', sortOrder: 3 },
+        { title: 'Relaxed arm weight into string',      status: 'in_progress', sortOrder: 4 },
+      ]) {
         await sql`INSERT INTO lesson_plan_item (section_id, title, status, grading_scale_id, current_grade_value, sort_order)
           VALUES (${sec1.id}, ${it.title}, ${it.status}, ${scaleId}, ${it.status === 'mastered' ? '4' : it.status === 'in_progress' ? '2' : null}, ${it.sortOrder})`
       }
 
-      // Section 2 — Reading Music: in progress
-      const [sec2] = await sql`
-        INSERT INTO lesson_plan_section (lesson_plan_id, title, sort_order)
-        VALUES (${plan.id}, 'Reading Music', 1) RETURNING id`
-      const readingItems = [
-        { title: 'Treble clef note names (C4–G5)',    status: 'mastered',     sortOrder: 0 },
-        { title: 'Bass clef note names (C3–G4)',      status: 'in_progress',  sortOrder: 1 },
-        { title: 'Note values: whole, half, quarter', status: 'mastered',     sortOrder: 2 },
-        { title: 'Time signatures: 4/4 and 3/4',      status: 'in_progress',  sortOrder: 3 },
-        { title: 'Bar lines and repeats',              status: 'not_started',  sortOrder: 4 },
-      ]
-      for (const it of readingItems) {
+      const [sec2] = await sql`INSERT INTO lesson_plan_section (lesson_plan_id, title, sort_order) VALUES (${plan.id}, 'Bowing Technique', 1) RETURNING id`
+      for (const it of [
+        { title: 'Open string bowing — all four strings', status: 'mastered',    sortOrder: 0 },
+        { title: 'Straight bow path',                     status: 'in_progress', sortOrder: 1 },
+        { title: 'Smooth bow changes at frog and tip',    status: 'in_progress', sortOrder: 2 },
+        { title: 'Detaché stroke',                        status: 'not_started', sortOrder: 3 },
+        { title: 'Staccato introduction',                 status: 'not_started', sortOrder: 4 },
+      ]) {
         await sql`INSERT INTO lesson_plan_item (section_id, title, status, grading_scale_id, current_grade_value, sort_order)
           VALUES (${sec2.id}, ${it.title}, ${it.status}, ${scaleId}, ${it.status === 'mastered' ? '4' : it.status === 'in_progress' ? '2' : null}, ${it.sortOrder})`
       }
 
-      // Section 3 — First Pieces: mix of complete and in progress
-      const [sec3] = await sql`
-        INSERT INTO lesson_plan_section (lesson_plan_id, title, sort_order)
-        VALUES (${plan.id}, 'First Pieces', 2) RETURNING id`
-      const pieceItems = [
-        { title: 'Five-finger melody (right hand only)',  status: 'mastered',    sortOrder: 0 },
-        { title: 'Simple left hand accompaniment',         status: 'mastered',    sortOrder: 1 },
-        { title: 'Hands together at slow tempo',           status: 'in_progress', sortOrder: 2 },
-        { title: 'Mary Had a Little Lamb',                 status: 'mastered',    sortOrder: 3 },
-        { title: 'Ode to Joy (Beethoven)',                 status: 'in_progress', sortOrder: 4 },
-        { title: 'Merrily We Roll Along',                  status: 'not_started', sortOrder: 5 },
-      ]
-      for (const it of pieceItems) {
+      const [sec3] = await sql`INSERT INTO lesson_plan_section (lesson_plan_id, title, sort_order) VALUES (${plan.id}, 'Suzuki Book 1 Repertoire', 2) RETURNING id`
+      for (const it of [
+        { title: 'Twinkle Twinkle — Variation A', status: 'mastered',    sortOrder: 0 },
+        { title: 'Twinkle Twinkle — Theme',       status: 'in_progress', sortOrder: 1 },
+        { title: 'Lightly Row',                   status: 'in_progress', sortOrder: 2 },
+        { title: 'Song of the Wind',              status: 'not_started', sortOrder: 3 },
+        { title: 'Go Tell Aunt Rhody',            status: 'not_started', sortOrder: 4 },
+      ]) {
         await sql`INSERT INTO lesson_plan_item (section_id, title, status, grading_scale_id, current_grade_value, sort_order)
           VALUES (${sec3.id}, ${it.title}, ${it.status}, ${scaleId}, ${it.status === 'mastered' ? '4' : it.status === 'in_progress' ? '2' : null}, ${it.sortOrder})`
       }
 
-      console.log('  Lesson plan: Tommy Smith — Piano Fundamentals')
+      console.log('  Lesson plan: Tommy Smith — Violin Suzuki Book 1')
     }
   }
 
diff --git a/packages/backend/src/routes/v1/inventory.ts b/packages/backend/src/routes/v1/inventory.ts
index 9db9282..ac28624 100644
--- a/packages/backend/src/routes/v1/inventory.ts
+++ b/packages/backend/src/routes/v1/inventory.ts
@@ -26,6 +26,11 @@ export const inventoryRoutes: FastifyPluginAsync = async (app) => {
     return reply.send(result)
   })
 
+  app.get('/categories/all', { preHandler: [app.authenticate, app.requirePermission('inventory.view')] }, async (request, reply) => {
+    const rows = await CategoryService.listAll(app.db)
+    return reply.send({ data: rows })
+  })
+
   app.get('/categories/:id', { preHandler: [app.authenticate, app.requirePermission('inventory.view')] }, async (request, reply) => {
     const { id } = request.params as { id: string }
     const category = await CategoryService.getById(app.db, id)
diff --git a/packages/backend/src/routes/v1/products.ts b/packages/backend/src/routes/v1/products.ts
index 055e4a9..0b75c51 100644
--- a/packages/backend/src/routes/v1/products.ts
+++ b/packages/backend/src/routes/v1/products.ts
@@ -4,9 +4,12 @@ import {
   ProductUpdateSchema,
   InventoryUnitCreateSchema,
   InventoryUnitUpdateSchema,
+  ProductSupplierCreateSchema,
+  ProductSupplierUpdateSchema,
+  StockReceiptCreateSchema,
   PaginationSchema,
 } from '@lunarfront/shared/schemas'
-import { ProductService, InventoryUnitService } from '../../services/product.service.js'
+import { ProductService, InventoryUnitService, ProductSupplierService, StockReceiptService } from '../../services/product.service.js'
 
 export const productRoutes: FastifyPluginAsync = async (app) => {
   // --- Products ---
@@ -22,7 +25,16 @@ export const productRoutes: FastifyPluginAsync = async (app) => {
 
   app.get('/products', { preHandler: [app.authenticate, app.requirePermission('inventory.view')] }, async (request, reply) => {
     const params = PaginationSchema.parse(request.query)
-    const result = await ProductService.list(app.db, params)
+    const q = request.query as Record<string, string>
+    const filters = {
+      categoryId: q.categoryId,
+      isActive: q.isActive === 'true' ? true : q.isActive === 'false' ? false : undefined,
+      isSerialized: q.isSerialized === 'true' ? true : q.isSerialized === 'false' ? false : undefined,
+      isRental: q.isRental === 'true' ? true : q.isRental === 'false' ? false : undefined,
+      isDualUseRepair: q.isDualUseRepair === 'true' ? true : q.isDualUseRepair === 'false' ? false : undefined,
+      lowStock: q.lowStock === 'true',
+    }
+    const result = await ProductService.list(app.db, params, filters)
     return reply.send(result)
   })
 
@@ -87,4 +99,66 @@ export const productRoutes: FastifyPluginAsync = async (app) => {
     if (!unit) return reply.status(404).send({ error: { message: 'Unit not found', statusCode: 404 } })
     return reply.send(unit)
   })
+
+  // --- Product Suppliers ---
+
+  app.get('/products/:productId/suppliers', { preHandler: [app.authenticate, app.requirePermission('inventory.view')] }, async (request, reply) => {
+    const { productId } = request.params as { productId: string }
+    const rows = await ProductSupplierService.listByProduct(app.db, productId)
+    return reply.send({ data: rows })
+  })
+
+  app.post('/products/:productId/suppliers', { preHandler: [app.authenticate, app.requirePermission('inventory.edit')] }, async (request, reply) => {
+    const { productId } = request.params as { productId: string }
+    const parsed = ProductSupplierCreateSchema.safeParse(request.body)
+    if (!parsed.success) {
+      return reply.status(400).send({ error: { message: 'Validation failed', details: parsed.error.flatten(), statusCode: 400 } })
+    }
+    const row = await ProductSupplierService.create(app.db, productId, parsed.data)
+    return reply.status(201).send(row)
+  })
+
+  app.patch('/products/:productId/suppliers/:id', { preHandler: [app.authenticate, app.requirePermission('inventory.edit')] }, async (request, reply) => {
+    const { productId, id } = request.params as { productId: string; id: string }
+    const parsed = ProductSupplierUpdateSchema.safeParse(request.body)
+    if (!parsed.success) {
+      return reply.status(400).send({ error: { message: 'Validation failed', details: parsed.error.flatten(), statusCode: 400 } })
+    }
+    const row = await ProductSupplierService.update(app.db, id, productId, parsed.data)
+    if (!row) return reply.status(404).send({ error: { message: 'Not found', statusCode: 404 } })
+    return reply.send(row)
+  })
+
+  app.delete('/products/:productId/suppliers/:id', { preHandler: [app.authenticate, app.requirePermission('inventory.edit')] }, async (request, reply) => {
+    const { id } = request.params as { id: string }
+    const row = await ProductSupplierService.delete(app.db, id)
+    if (!row) return reply.status(404).send({ error: { message: 'Not found', statusCode: 404 } })
+    return reply.send(row)
+  })
+
+  // --- Price History ---
+
+  app.get('/products/:productId/price-history', { preHandler: [app.authenticate, app.requirePermission('inventory.view')] }, async (request, reply) => {
+    const { productId } = request.params as { productId: string }
+    const rows = await ProductService.listPriceHistory(app.db, productId)
+    return reply.send({ data: rows })
+  })
+
+  // --- Stock Receipts ---
+
+  app.post('/products/:productId/stock-receipts', { preHandler: [app.authenticate, app.requirePermission('inventory.edit')] }, async (request, reply) => {
+    const { productId } = request.params as { productId: string }
+    const parsed = StockReceiptCreateSchema.safeParse(request.body)
+    if (!parsed.success) {
+      return reply.status(400).send({ error: { message: 'Validation failed', details: parsed.error.flatten(), statusCode: 400 } })
+    }
+    const receipt = await StockReceiptService.create(app.db, productId, parsed.data)
+    return reply.status(201).send(receipt)
+  })
+
+  app.get('/products/:productId/stock-receipts', { preHandler: [app.authenticate, app.requirePermission('inventory.view')] }, async (request, reply) => {
+    const { productId } = request.params as { productId: string }
+    const rows = await StockReceiptService.listByProduct(app.db, productId)
+    return reply.send({ data: rows })
+  })
 }
diff --git a/packages/backend/src/services/inventory.service.ts b/packages/backend/src/services/inventory.service.ts
index edbc81c..35436f5 100644
--- a/packages/backend/src/services/inventory.service.ts
+++ b/packages/backend/src/services/inventory.service.ts
@@ -60,6 +60,14 @@ export const CategoryService = {
     return paginatedResponse(data, total, params.page, params.limit)
   },
 
+  async listAll(db: PostgresJsDatabase<any>) {
+    return db
+      .select()
+      .from(categories)
+      .where(eq(categories.isActive, true))
+      .orderBy(categories.sortOrder, categories.name)
+  },
+
   async update(db: PostgresJsDatabase<any>, id: string, input: CategoryUpdateInput) {
     const [category] = await db
       .update(categories)
diff --git a/packages/backend/src/services/product.service.ts b/packages/backend/src/services/product.service.ts
index e36db73..b59debb 100644
--- a/packages/backend/src/services/product.service.ts
+++ b/packages/backend/src/services/product.service.ts
@@ -1,12 +1,15 @@
-import { eq, and, count, type Column } from 'drizzle-orm'
+import { eq, and, count, desc, lte, sql, type Column } from 'drizzle-orm'
 import type { PostgresJsDatabase } from 'drizzle-orm/postgres-js'
-import { products, inventoryUnits, priceHistory } from '../db/schema/inventory.js'
+import { products, inventoryUnits, priceHistory as priceHistoryTable, productSuppliers, suppliers, stockReceipts } from '../db/schema/inventory.js'
 import { ValidationError } from '../lib/errors.js'
 import type {
   ProductCreateInput,
   ProductUpdateInput,
   InventoryUnitCreateInput,
   InventoryUnitUpdateInput,
+  ProductSupplierCreateInput,
+  ProductSupplierUpdateInput,
+  StockReceiptCreateInput,
   PaginationInput,
 } from '@lunarfront/shared/schemas'
 import {
@@ -40,14 +43,39 @@ export const ProductService = {
     return product ?? null
   },
 
-  async list(db: PostgresJsDatabase<any>, params: PaginationInput) {
-    const baseWhere = eq(products.isActive, true)
+  async list(db: PostgresJsDatabase<any>, params: PaginationInput, filters?: {
+    categoryId?: string
+    isActive?: boolean
+    isSerialized?: boolean
+    isRental?: boolean
+    isDualUseRepair?: boolean
+    lowStock?: boolean
+  }) {
+    const conditions = [eq(products.isActive, filters?.isActive ?? true)]
 
-    const searchCondition = params.q
-      ? buildSearchCondition(params.q, [products.name, products.sku, products.upc, products.brand])
-      : undefined
+    if (params.q) {
+      conditions.push(buildSearchCondition(params.q, [products.name, products.sku, products.upc, products.brand])!)
+    }
+    if (filters?.categoryId) {
+      conditions.push(eq(products.categoryId, filters.categoryId))
+    }
+    if (filters?.isSerialized !== undefined) {
+      conditions.push(eq(products.isSerialized, filters.isSerialized))
+    }
+    if (filters?.isRental !== undefined) {
+      conditions.push(eq(products.isRental, filters.isRental))
+    }
+    if (filters?.isDualUseRepair !== undefined) {
+      conditions.push(eq(products.isDualUseRepair, filters.isDualUseRepair))
+    }
+    if (filters?.lowStock) {
+      // qty_on_hand <= qty_reorder_point (and reorder point is set) OR qty_on_hand = 0
+      conditions.push(
+        sql`(${products.qtyOnHand} = 0 OR (${products.qtyReorderPoint} IS NOT NULL AND ${products.qtyOnHand} <= ${products.qtyReorderPoint}))`
+      )
+    }
 
-    const where = searchCondition ? and(baseWhere, searchCondition) : baseWhere
+    const where = conditions.length === 1 ? conditions[0] : and(...conditions)
 
     const sortableColumns: Record<string, Column> = {
       name: products.name,
@@ -78,7 +106,7 @@ export const ProductService = {
     if (input.price !== undefined || input.minPrice !== undefined) {
       const existing = await this.getById(db, id)
       if (existing) {
-        await db.insert(priceHistory).values({
+        await db.insert(priceHistoryTable).values({
           productId: id,
           previousPrice: existing.price,
           newPrice: input.price?.toString() ?? existing.price ?? '0',
@@ -111,6 +139,14 @@ export const ProductService = {
       .returning()
     return product ?? null
   },
+
+  async listPriceHistory(db: PostgresJsDatabase<any>, productId: string) {
+    return db
+      .select()
+      .from(priceHistoryTable)
+      .where(eq(priceHistoryTable.productId, productId))
+      .orderBy(desc(priceHistoryTable.createdAt))
+  },
 }
 
 export const InventoryUnitService = {
@@ -200,3 +236,118 @@ export const InventoryUnitService = {
     return unit ?? null
   },
 }
+
+export const ProductSupplierService = {
+  async listByProduct(db: PostgresJsDatabase<any>, productId: string) {
+    return db
+      .select({
+        id: productSuppliers.id,
+        productId: productSuppliers.productId,
+        supplierId: productSuppliers.supplierId,
+        supplierSku: productSuppliers.supplierSku,
+        isPreferred: productSuppliers.isPreferred,
+        createdAt: productSuppliers.createdAt,
+        supplierName: suppliers.name,
+        supplierContactName: suppliers.contactName,
+        supplierEmail: suppliers.email,
+        supplierPhone: suppliers.phone,
+        supplierAccountNumber: suppliers.accountNumber,
+        supplierPaymentTerms: suppliers.paymentTerms,
+      })
+      .from(productSuppliers)
+      .innerJoin(suppliers, eq(productSuppliers.supplierId, suppliers.id))
+      .where(eq(productSuppliers.productId, productId))
+      .orderBy(desc(productSuppliers.isPreferred), suppliers.name)
+  },
+
+  async create(db: PostgresJsDatabase<any>, productId: string, input: ProductSupplierCreateInput) {
+    if (input.isPreferred) {
+      await db
+        .update(productSuppliers)
+        .set({ isPreferred: false })
+        .where(eq(productSuppliers.productId, productId))
+    }
+    const [row] = await db
+      .insert(productSuppliers)
+      .values({ productId, ...input })
+      .returning()
+    return row
+  },
+
+  async update(db: PostgresJsDatabase<any>, id: string, productId: string, input: ProductSupplierUpdateInput) {
+    if (input.isPreferred) {
+      await db
+        .update(productSuppliers)
+        .set({ isPreferred: false })
+        .where(eq(productSuppliers.productId, productId))
+    }
+    const [row] = await db
+      .update(productSuppliers)
+      .set(input)
+      .where(eq(productSuppliers.id, id))
+      .returning()
+    return row ?? null
+  },
+
+  async delete(db: PostgresJsDatabase<any>, id: string) {
+    const [row] = await db
+      .delete(productSuppliers)
+      .where(eq(productSuppliers.id, id))
+      .returning()
+    return row ?? null
+  },
+}
+
+export const StockReceiptService = {
+  async create(db: PostgresJsDatabase<any>, productId: string, input: StockReceiptCreateInput) {
+    const totalCost = (input.costPerUnit * input.qty).toFixed(2)
+
+    const [receipt] = await db
+      .insert(stockReceipts)
+      .values({
+        productId,
+        supplierId: input.supplierId,
+        inventoryUnitId: input.inventoryUnitId,
+        qty: input.qty,
+        costPerUnit: input.costPerUnit.toString(),
+        totalCost,
+        receivedDate: input.receivedDate,
+        invoiceNumber: input.invoiceNumber,
+        notes: input.notes,
+      })
+      .returning()
+
+    // For non-serialized products, increment qty_on_hand
+    const [product] = await db.select().from(products).where(eq(products.id, productId)).limit(1)
+    if (product && !product.isSerialized) {
+      await db
+        .update(products)
+        .set({ qtyOnHand: product.qtyOnHand + input.qty, updatedAt: new Date() })
+        .where(eq(products.id, productId))
+    }
+
+    return receipt
+  },
+
+  async listByProduct(db: PostgresJsDatabase<any>, productId: string) {
+    return db
+      .select({
+        id: stockReceipts.id,
+        productId: stockReceipts.productId,
+        supplierId: stockReceipts.supplierId,
+        inventoryUnitId: stockReceipts.inventoryUnitId,
+        qty: stockReceipts.qty,
+        costPerUnit: stockReceipts.costPerUnit,
+        totalCost: stockReceipts.totalCost,
+        receivedDate: stockReceipts.receivedDate,
+        invoiceNumber: stockReceipts.invoiceNumber,
+        notes: stockReceipts.notes,
+        createdAt: stockReceipts.createdAt,
+        supplierName: suppliers.name,
+      })
+      .from(stockReceipts)
+      .leftJoin(suppliers, eq(stockReceipts.supplierId, suppliers.id))
+      .where(eq(stockReceipts.productId, productId))
+      .orderBy(desc(stockReceipts.receivedDate), desc(stockReceipts.createdAt))
+  },
+}
diff --git a/packages/shared/src/schemas/index.ts b/packages/shared/src/schemas/index.ts
index bace48a..f56268c 100644
--- a/packages/shared/src/schemas/index.ts
+++ b/packages/shared/src/schemas/index.ts
@@ -55,6 +55,9 @@ export {
   ProductSearchSchema,
   InventoryUnitCreateSchema,
   InventoryUnitUpdateSchema,
+  ProductSupplierCreateSchema,
+  ProductSupplierUpdateSchema,
+  StockReceiptCreateSchema,
 } from './inventory.schema.js'
 export type {
   CategoryCreateInput,
@@ -65,6 +68,9 @@ export type {
   ProductUpdateInput,
   InventoryUnitCreateInput,
   InventoryUnitUpdateInput,
+  ProductSupplierCreateInput,
+  ProductSupplierUpdateInput,
+  StockReceiptCreateInput,
 } from './inventory.schema.js'
 
 export {
diff --git a/packages/shared/src/schemas/inventory.schema.ts b/packages/shared/src/schemas/inventory.schema.ts
index f79306a..95abd8a 100644
--- a/packages/shared/src/schemas/inventory.schema.ts
+++ b/packages/shared/src/schemas/inventory.schema.ts
@@ -90,3 +90,24 @@ export type InventoryUnitCreateInput = z.infer<typeof InventoryUnitCreateSchema>
 
 export const InventoryUnitUpdateSchema = InventoryUnitCreateSchema.omit({ productId: true }).partial()
 export type InventoryUnitUpdateInput = z.infer<typeof InventoryUnitUpdateSchema>
+
+export const ProductSupplierCreateSchema = z.object({
+  supplierId: z.string().uuid(),
+  supplierSku: opt(z.string().max(100)),
+  isPreferred: z.boolean().default(false),
+})
+export type ProductSupplierCreateInput = z.infer<typeof ProductSupplierCreateSchema>
+
+export const ProductSupplierUpdateSchema = ProductSupplierCreateSchema.omit({ supplierId: true }).partial()
+export type ProductSupplierUpdateInput = z.infer<typeof ProductSupplierUpdateSchema>
+
+export const StockReceiptCreateSchema = z.object({
+  supplierId: opt(z.string().uuid()),
+  inventoryUnitId: opt(z.string().uuid()),
+  qty: z.number().int().min(1).default(1),
+  costPerUnit: z.number().min(0),
+  receivedDate: z.string().date(),
+  invoiceNumber: opt(z.string().max(100)),
+  notes: opt(z.string()),
+})
+export type StockReceiptCreateInput = z.infer<typeof StockReceiptCreateSchema>