Optimize order and product import scripts with improved performance and incremental update handling

- Refactor orders import to use temporary tables for more efficient data processing
- Improve batch processing and memory management in order import script
- Update product import to use temporary tables for inventory status
- Modify purchase orders import to use updated timestamp for incremental updates
- Enhance error handling and logging for import processes

inventory-server/scripts/import/purchase-orders.js

@@ -29,7 +29,7 @@ async function importPurchaseOrders(prodConnection, localConnection, incremental
     // Build incremental conditions
     const incrementalWhereClause = incrementalUpdate
       ? `AND (
-          p.stamp > ? 
+          p.date_updated > ? 
           OR p.date_modified > ?
           OR p.date_ordered > ?
           OR p.date_estin > ?
@@ -81,7 +81,7 @@ async function importPurchaseOrders(prodConnection, localConnection, incremental
         USE INDEX (idx_date_created)
         WHERE date_ordered >= DATE_SUB(CURRENT_DATE, INTERVAL 5 YEAR)
           AND (date_ordered > ?
-          OR stamp > ?
+          OR date_updated > ?
           OR date_modified > ?)
         UNION
         SELECT DISTINCT r.receiving_id as po_id