# Model Update Progress

## ✅ Completed Models

1. **Product.js**
   - ✅ Removed `default_vat_rate` field
   - ✅ Removed `tax_category_id` field
   - ✅ Added `low_stock_threshold` field
   - ✅ Removed ProductVariant association
   - ✅ Removed TaxCategory association
   - ✅ Removed TaxExemption association
   - ✅ Added BOM and ProductionOrder associations

2. **BOM.js**
   - ✅ Changed `fg_variant_id` → `fg_product_id`
   - ✅ Updated index from `fg_variant_id` to `fg_product_id`
   - ✅ Updated association from ProductVariant to Product

3. **ProductionOrder.js**
   - ✅ Changed `fg_variant_id` → `fg_product_id`
   - ✅ Updated index from `fg_variant_id` to `fg_product_id`
   - ✅ Updated association from ProductVariant to Product
   - ✅ Added BOM association

4. **Sale.js**
   - ✅ Removed `vat` field
   - ✅ Updated `total` calculation comment (removed VAT reference)

5. **SaleItem.js**
   - ✅ Removed `variant_id` field and association
   - ✅ Removed `vat_rate` field
   - ✅ Removed `vat_amount` field (didn't exist)
   - ✅ Removed variant_id index

6. **Inventory.js**
   - ✅ Removed `variant_id` field and association
   - ✅ Updated unique index from composite (`product_id`, `variant_id`) to single (`product_id`)

7. **InventoryItem.js**
   - ✅ Removed `variant_id` field and association
   - ✅ Removed variant_id index

8. **InventoryMovement.js**
   - ✅ Removed `variant_id` field and association
   - ✅ Removed variant_id index

9. **ProductPrice.js**
   - ✅ Removed `variant_id` field and association
   - ✅ Removed variant_id indexes (single and composite)

10. **GRNItem.js**
    - ✅ Removed `variant_id` field and association
    - ✅ Removed variant_id index

11. **PurchaseOrderItem.js**
    - ✅ Removed `variant_id` field and association
    - ✅ Removed variant_id index

12. **Payment.js**
    - ✅ Updated `provider` enum from `('PAYSTACK', 'CASH', 'MOBILE', 'BANK')` to `('CASH', 'CARD', 'MPESA')`

13. **index.js**
    - ✅ Removed ProductVariant import and references
    - ✅ Removed TaxCategory, TaxRate, TaxExemption imports and references
    - ✅ Removed associations to deleted models

14. **Deleted Model Files**
    - ✅ Deleted ProductVariant.js
    - ✅ Deleted TaxCategory.js
    - ✅ Deleted TaxRate.js
    - ✅ Deleted TaxExemption.js

## Summary

All model updates have been completed! The models now:
- ✅ No longer reference product variants
- ✅ No longer reference tax tables
- ✅ Use `fg_product_id` instead of `fg_variant_id` for BOM and ProductionOrder
- ✅ Payment provider enum updated to CASH/CARD/MPESA
- ✅ Product model includes `low_stock_threshold`
- ✅ All variant_id fields and indexes removed
- ✅ All tax-related fields removed

## Next Steps

1. ✅ Models updated
2. ⏳ Sync database from updated models (using Sequelize sync)
3. ⏳ Verify all tables are created correctly
4. ⏳ Update backend services to use new model structure
5. ⏳ Update frontend to match new structure
