feat: add admin inventory management (Phase 1)
- Add admin API endpoints for inventory management - Add inventory page with vendor selector and filtering - Add admin schemas for cross-vendor inventory operations - Support digital products with unlimited inventory - Add integration tests for admin inventory API - Add inventory management guide documentation Mirrors vendor inventory functionality with admin-level access. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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docs/implementation/inventory-admin-migration.md
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docs/implementation/inventory-admin-migration.md
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# Admin Inventory Management Migration Plan
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## Overview
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**Objective:** Add inventory management capabilities to the admin "Vendor Operations" section, allowing administrators to view and manage vendor inventory on their behalf.
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**Status:** Phase 1 Complete
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---
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## Current State Analysis
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### What Exists
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The inventory system is **fully implemented at the vendor API level** with comprehensive functionality:
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| Component | Status | Location |
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|-----------|--------|----------|
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| Database Model | ✅ Complete | `models/database/inventory.py` |
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| Pydantic Schemas | ✅ Complete | `models/schema/inventory.py` |
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| Service Layer | ✅ Complete | `app/services/inventory_service.py` |
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| Vendor API | ✅ Complete | `app/api/v1/vendor/inventory.py` |
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| Exceptions | ✅ Complete | `app/exceptions/inventory.py` |
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| Unit Tests | ✅ Complete | `tests/unit/services/test_inventory_service.py` |
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| Integration Tests | ✅ Complete | `tests/integration/api/v1/vendor/test_inventory.py` |
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| Vendor UI | 🔲 Placeholder | `app/templates/vendor/inventory.html` |
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| Admin API | 🔲 Not Started | - |
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| Admin UI | 🔲 Not Started | - |
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| Audit Trail | 🔲 Not Started | Logs only, no dedicated table |
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### Storage/Location Architecture
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The inventory system tracks stock at the **storage location level**:
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```
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Product A
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├── WAREHOUSE_MAIN: 100 units (10 reserved)
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├── WAREHOUSE_WEST: 50 units (0 reserved)
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└── STORE_FRONT: 25 units (5 reserved)
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Total: 175 units | Reserved: 15 | Available: 160
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```
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**Key design decisions:**
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- One product can have inventory across multiple locations
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- Unique constraint: `(product_id, location)` - one entry per product/location
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- Locations are text strings, normalized to UPPERCASE
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- Available quantity = `quantity - reserved_quantity`
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### Existing Operations
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| Operation | Description | Service Method |
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|-----------|-------------|----------------|
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| **Set** | Replace exact quantity at location | `set_inventory()` |
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| **Adjust** | Add/remove quantity (positive/negative) | `adjust_inventory()` |
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| **Reserve** | Mark items for pending order | `reserve_inventory()` |
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| **Release** | Cancel reservation | `release_reservation()` |
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| **Fulfill** | Complete order (reduces both qty & reserved) | `fulfill_reservation()` |
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| **Get Product** | Summary across all locations | `get_product_inventory()` |
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| **Get Vendor** | List with filters | `get_vendor_inventory()` |
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| **Update** | Partial field update | `update_inventory()` |
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| **Delete** | Remove inventory entry | `delete_inventory()` |
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### Vendor API Endpoints
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All endpoints at `/api/v1/vendor/inventory/*`:
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| Method | Endpoint | Operation |
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|--------|----------|-----------|
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| POST | `/inventory/set` | Set exact quantity |
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| POST | `/inventory/adjust` | Add/remove quantity |
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| POST | `/inventory/reserve` | Reserve for order |
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| POST | `/inventory/release` | Cancel reservation |
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| POST | `/inventory/fulfill` | Complete order |
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| GET | `/inventory/product/{id}` | Product summary |
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| GET | `/inventory` | List with filters |
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| PUT | `/inventory/{id}` | Update entry |
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| DELETE | `/inventory/{id}` | Delete entry |
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---
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## Gap Analysis
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### What's Missing for Admin Vendor Operations
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1. **Admin API Endpoints** - ✅ Implemented in Phase 1
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2. **Admin UI Page** - No inventory management interface in admin panel
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3. **Vendor Selector** - Admin needs to select which vendor to manage
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4. **Cross-Vendor View** - ✅ Implemented in Phase 1
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5. **Audit Trail** - Only application logs, no queryable audit history
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6. **Bulk Operations** - No bulk adjust/import capabilities
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7. **Low Stock Alerts** - Basic filter exists, no alert configuration
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### Digital Products - Infinite Inventory ✅
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**Implementation Complete**
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Digital products now have unlimited inventory by default:
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```python
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# In Product model (models/database/product.py)
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UNLIMITED_INVENTORY = 999999
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@property
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def has_unlimited_inventory(self) -> bool:
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"""Digital products have unlimited inventory."""
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return self.is_digital
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@property
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def available_inventory(self) -> int:
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"""Calculate available inventory (total - reserved).
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Digital products return unlimited inventory.
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"""
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if self.has_unlimited_inventory:
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return self.UNLIMITED_INVENTORY
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return sum(inv.available_quantity for inv in self.inventory_entries)
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```
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**Behavior:**
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- Physical products: Sum of inventory entries (0 if no entries)
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- Digital products: Returns `999999` (unlimited) regardless of entries
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- Orders for digital products never fail due to "insufficient inventory"
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**Tests:** `tests/unit/models/database/test_product.py::TestProductInventoryProperties`
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**Documentation:** [Inventory Management Guide](../guides/inventory-management.md)
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---
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## Migration Plan
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### Phase 1: Admin API Endpoints
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**Goal:** Expose inventory management to admin users with vendor selection
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#### 1.1 New File: `app/api/v1/admin/inventory.py`
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Admin endpoints that mirror vendor functionality with vendor_id as parameter:
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| Method | Endpoint | Description |
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|--------|----------|-------------|
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| GET | `/admin/inventory` | List all inventory (cross-vendor) |
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| GET | `/admin/inventory/vendors/{vendor_id}` | Vendor-specific inventory |
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| GET | `/admin/inventory/products/{product_id}` | Product inventory summary |
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| POST | `/admin/inventory/set` | Set inventory (requires vendor_id) |
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| POST | `/admin/inventory/adjust` | Adjust inventory |
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| PUT | `/admin/inventory/{id}` | Update inventory entry |
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| DELETE | `/admin/inventory/{id}` | Delete inventory entry |
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| GET | `/admin/inventory/low-stock` | Low stock report |
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#### 1.2 Schema Extensions
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Add admin-specific request schemas in `models/schema/inventory.py`:
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```python
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class AdminInventoryCreate(InventoryCreate):
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"""Admin version - requires explicit vendor_id."""
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vendor_id: int = Field(..., description="Target vendor ID")
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class AdminInventoryAdjust(InventoryAdjust):
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"""Admin version - requires explicit vendor_id."""
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vendor_id: int = Field(..., description="Target vendor ID")
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class AdminInventoryListResponse(BaseModel):
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"""Cross-vendor inventory list."""
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inventories: list[InventoryResponse]
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total: int
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skip: int
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limit: int
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vendor_filter: int | None = None
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```
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#### 1.3 Service Layer Reuse
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The existing `InventoryService` already accepts `vendor_id` as a parameter - **no service changes needed**. Admin endpoints simply pass the vendor_id from the request instead of from the JWT token.
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### Phase 2: Admin UI
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**Goal:** Create admin inventory management page
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#### 2.1 New Files
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| File | Description |
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|------|-------------|
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| `app/templates/admin/inventory.html` | Main inventory page |
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| `static/admin/js/inventory.js` | Alpine.js controller |
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#### 2.2 UI Features
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1. **Vendor Selector Dropdown** - Filter by vendor (or show all)
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2. **Inventory Table** - Product, Location, Quantity, Reserved, Available
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3. **Search/Filter** - By product name, location, low stock
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4. **Adjust Modal** - Quick add/remove with reason
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5. **Pagination** - Handle large inventories
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6. **Export** - CSV download (future)
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#### 2.3 Page Layout
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```
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┌─────────────────────────────────────────────────────────┐
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│ Inventory Management [Vendor: All ▼] │
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├─────────────────────────────────────────────────────────┤
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│ [Search...] [Location ▼] [Low Stock Only ☐] │
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├─────────────────────────────────────────────────────────┤
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│ Product │ Location │ Qty │ Reserved │ Available │
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│──────────────┼─────────────┼─────┼──────────┼───────────│
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│ Widget A │ WAREHOUSE_A │ 100 │ 10 │ 90 [⚙️] │
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│ Widget A │ WAREHOUSE_B │ 50 │ 0 │ 50 [⚙️] │
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│ Gadget B │ WAREHOUSE_A │ 25 │ 5 │ 20 [⚙️] │
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├─────────────────────────────────────────────────────────┤
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│ Showing 1-20 of 150 [< 1 2 3 ... >] │
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└─────────────────────────────────────────────────────────┘
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```
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#### 2.4 Sidebar Integration
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Add to `app/templates/admin/partials/sidebar.html`:
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```html
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<!-- Under Vendor Operations section -->
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<li class="relative px-6 py-3">
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<a href="/admin/inventory" ...>
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<span class="inline-flex items-center">
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<!-- inventory icon -->
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<span class="ml-4">Inventory</span>
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</span>
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</a>
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</li>
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```
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### Phase 3: Audit Trail (Optional Enhancement)
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**Goal:** Track inventory changes with queryable history
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#### 3.1 Database Migration
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```sql
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CREATE TABLE inventory_audit_log (
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id SERIAL PRIMARY KEY,
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inventory_id INTEGER REFERENCES inventory(id) ON DELETE SET NULL,
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product_id INTEGER NOT NULL,
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vendor_id INTEGER NOT NULL,
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location VARCHAR(255) NOT NULL,
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-- Change details
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operation VARCHAR(50) NOT NULL, -- 'set', 'adjust', 'reserve', 'release', 'fulfill'
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quantity_before INTEGER,
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quantity_after INTEGER,
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reserved_before INTEGER,
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reserved_after INTEGER,
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adjustment_amount INTEGER,
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-- Context
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reason VARCHAR(500),
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performed_by INTEGER REFERENCES users(id),
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performed_by_type VARCHAR(20) NOT NULL, -- 'vendor', 'admin', 'system'
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created_at TIMESTAMP DEFAULT NOW()
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);
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CREATE INDEX idx_audit_vendor ON inventory_audit_log(vendor_id);
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CREATE INDEX idx_audit_product ON inventory_audit_log(product_id);
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CREATE INDEX idx_audit_created ON inventory_audit_log(created_at);
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```
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#### 3.2 Service Enhancement
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Add audit logging to `InventoryService` methods:
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```python
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def _log_audit(
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self,
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db: Session,
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inventory: Inventory,
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operation: str,
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qty_before: int,
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qty_after: int,
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reserved_before: int,
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reserved_after: int,
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user_id: int | None,
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user_type: str,
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reason: str | None = None
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) -> None:
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"""Record inventory change in audit log."""
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audit = InventoryAuditLog(
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inventory_id=inventory.id,
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product_id=inventory.product_id,
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vendor_id=inventory.vendor_id,
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location=inventory.location,
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operation=operation,
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quantity_before=qty_before,
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quantity_after=qty_after,
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reserved_before=reserved_before,
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reserved_after=reserved_after,
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adjustment_amount=qty_after - qty_before,
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reason=reason,
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performed_by=user_id,
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performed_by_type=user_type,
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)
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db.add(audit)
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```
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---
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## Implementation Checklist
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### Phase 1: Admin API ✅
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- [x] Create `app/api/v1/admin/inventory.py`
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- [x] Add admin inventory schemas to `models/schema/inventory.py`
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- [x] Register routes in `app/api/v1/admin/__init__.py`
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- [x] Write integration tests `tests/integration/api/v1/admin/test_inventory.py`
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### Phase 2: Admin UI
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- [ ] Create `app/templates/admin/inventory.html`
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- [ ] Create `static/admin/js/inventory.js`
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- [ ] Add route in `app/routes/admin.py`
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- [ ] Add sidebar menu item
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- [ ] Update `static/admin/js/init-alpine.js` for page mapping
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### Phase 3: Audit Trail (Optional)
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- [ ] Create Alembic migration for `inventory_audit_log` table
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- [ ] Create `models/database/inventory_audit_log.py`
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- [ ] Update `InventoryService` with audit logging
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- [ ] Add audit history endpoint
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- [ ] Add audit history UI component
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---
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## Testing Strategy
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### Unit Tests
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- Admin schema validation tests
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- Audit log creation tests (if implemented)
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### Integration Tests
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- Admin inventory endpoints with authentication
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- Vendor isolation verification (admin can access any vendor)
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- Audit trail creation on operations
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### Manual Testing
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- Verify vendor selector works correctly
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- Test adjust modal workflow
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- Confirm pagination with large datasets
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---
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## Rollback Plan
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Each phase is independent:
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1. **Phase 1 Rollback:** Remove admin inventory routes from `__init__.py`
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2. **Phase 2 Rollback:** Remove sidebar link, delete template/JS files
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3. **Phase 3 Rollback:** Run down migration to drop audit table
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---
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## Dependencies
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- Existing `InventoryService` (no changes required)
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- Admin authentication (`get_current_admin_api`)
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- Vendor model for vendor selector dropdown
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---
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## Related Documentation
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- [Vendor Operations Expansion Plan](../development/migration/vendor-operations-expansion.md)
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- [Admin Integration Guide](../backend/admin-integration-guide.md)
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- [Architecture Patterns](../architecture/architecture-patterns.md)
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