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inventory/docs/metrics-changes.md

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# Metrics System Changes
## Schema Changes
### Product Identifiers
- Changed `product_id` to `pid` throughout all metrics tables and queries
- Changed `category_id` to `cat_id` in category-related queries
### Purchase Orders
- Changed status check from `status = 'closed'` to `receiving_status >= 30`
- Added comment `-- Partial or fully received` for clarity
- Now using `received_date` instead of relying on status changes
### New Product Fields
- Added support for `notions_inv_count`
- Added support for `date_last_sold`
- Added support for `total_sold`
- Using `visible` flag for active product counts
### Field Size Updates
- Increased size of financial fields to handle larger numbers:
- Changed category metrics `total_value` from `DECIMAL(10,3)` to `DECIMAL(15,3)`
- Changed brand metrics financial fields from `DECIMAL(10,2)` to `DECIMAL(15,2)`
- Affects `total_stock_cost`, `total_stock_retail`, `total_revenue`
## Metrics File Changes
### Product Metrics (`product-metrics.js`)
- Updated SQL queries to use new field names
- Enhanced stock status calculations
- Added financial metrics:
- `gross_profit`
- `gmroi`
- `avg_margin_percent`
- `inventory_value`
- Improved reorder quantity calculations with:
- Enhanced safety stock calculation
- Lead time consideration
- Service level factors
- Added NaN/NULL value handling:
- Added `sanitizeValue` helper function
- Properly converts JavaScript NaN to SQL NULL
- Ensures all numeric fields have valid values
### Vendor Metrics (`vendor-metrics.js`)
- Updated field references to use `pid`
- Modified purchase order status checks
- Enhanced vendor performance metrics:
- Order fill rate calculation
- On-time delivery rate
- Lead time tracking
### Category Metrics (`category-metrics.js`)
- Updated to use `cat_id` instead of `category_id`
- Enhanced category performance tracking:
- Active vs total products
- Category growth rate
- Turnover rate
- Added time-based metrics for:
- Product counts
- Revenue tracking
- Margin analysis
- Added NULL brand handling:
- Uses 'Unbranded' for NULL brand values
- Maintains data integrity in category sales metrics
### Brand Metrics (`brand-metrics.js`)
- Updated product references to use `pid`
- Enhanced brand performance metrics:
- Stock value calculations
- Revenue tracking
- Growth rate analysis
- Added time-based aggregates for:
- Stock levels
- Sales performance
- Margin analysis
- Increased field sizes to handle large retailers
### Sales Forecasts (`sales-forecasts.js`)
- Updated to use new product identifiers
- Enhanced forecast calculations:
- Day-of-week patterns
- Seasonality factors
- Confidence levels
- Added category-level forecasts with:
- Units and revenue predictions
- Confidence scoring
- Seasonal adjustments
### Time Aggregates (`time-aggregates.js`)
- Updated field references to use `pid`
- Enhanced financial metrics:
- GMROI calculations
- Profit margin tracking
- Added inventory value tracking
- Improved purchase order integration
## Database Impact
### Tables Modified
- `product_metrics`
- `vendor_metrics`
- `vendor_time_metrics`
- `category_metrics`
- `category_time_metrics`
- `brand_metrics`
- `brand_time_metrics`
- `sales_forecasts`
- `category_forecasts`
- `product_time_aggregates`
### New Fields Added
Several tables have new fields for:
- Enhanced financial tracking
- Improved inventory metrics
- Better performance monitoring
- More accurate forecasting
## Frontend Considerations
### Data Access Changes
- All product lookups need to use `pid` instead of `product_id`
- Category references should use `cat_id`
- Purchase order status checks need updating
- Handle 'Unbranded' as a valid brand value
### New Features Available
- Enhanced stock status indicators
- More detailed financial metrics
- Improved forecasting data
- Better category and brand performance tracking
### UI Updates Needed
- Update all API calls to use new field names
- Modify data displays for new metrics
- Add new financial performance indicators
- Update stock status logic
- Enhance forecast displays
## API Route Updates Needed
### Product Routes
- Update ID field references
- Modify stock status calculations
- Add new financial metrics endpoints
### Category Routes
- Update to use `cat_id`
- Add new performance metrics
- Include time-based aggregates
### Vendor Routes
- Update product reference handling
- Add enhanced performance metrics
- Include new time-based data
### Reporting Routes
- Update all ID references
- Add new metrics support
- Include enhanced forecasting data
## Migration Considerations
### Data Migration
- Update existing records to use new IDs
- Backfill new metrics where possible
- Verify data integrity after changes
- Handle NULL to 'Unbranded' brand conversion
### Code Updates
- Update all API endpoints
- Modify database queries
- Update frontend components
- Revise reporting logic
### Testing Requirements
- Verify ID changes throughout system
- Test new metrics calculations
- Validate forecasting accuracy
- Check performance impact
- Verify NULL value handling