Add back product-category import and product time estimates

inventory-server/scripts/import/products.js

@@ -412,13 +412,66 @@ async function importProducts(prodConnection, localConnection) {
 
       await localConnection.query(insertQuery, productValues);
 
+      // Insert category relationships
+      const categoryRelationships = [];
+      batch.forEach(row => {
+        if (row.category_ids) {
+          const catIds = row.category_ids
+            .split(",")
+            .map(id => id.trim())
+            .filter(id => id)
+            .map(Number);
+          
+          catIds.forEach(catId => {
+            if (catId) categoryRelationships.push([row.pid, catId]);
+          });
+        }
+      });
+
+      if (categoryRelationships.length > 0) {
+        // First verify categories exist
+        const uniqueCatIds = [...new Set(categoryRelationships.map(([_, catId]) => catId))];
+        const [existingCats] = await localConnection.query(
+          "SELECT cat_id FROM categories WHERE cat_id IN (?)",
+          [uniqueCatIds]
+        );
+        const existingCatIds = new Set(existingCats.map(c => c.cat_id));
+
+        // Filter relationships to only include existing categories
+        const validRelationships = categoryRelationships.filter(([_, catId]) => 
+          existingCatIds.has(catId)
+        );
+
+        if (validRelationships.length > 0) {
+          // Delete existing relationships for these products first
+          await localConnection.query(
+            "DELETE FROM product_categories WHERE pid IN (?)",
+            [batch.map(p => p.pid)]
+          );
+
+          // Insert new relationships using INSERT IGNORE
+          const catPlaceholders = validRelationships
+            .map(() => "(?, ?)")
+            .join(",");
+          
+          await localConnection.query(
+            `INSERT IGNORE INTO product_categories (pid, cat_id)
+             VALUES ${catPlaceholders}`,
+            validRelationships.flat()
+          );
+        }
+      }
+
       processed += batch.length;
       outputProgress({
         status: "running",
         operation: "Products import",
         message: `Processed ${processed} of ${totalProducts} products`,
         current: processed,
-        total: totalProducts
+        total: totalProducts,
+        elapsed: formatElapsedTime((Date.now() - startTime) / 1000),
+        remaining: estimateRemaining(startTime, processed, totalProducts),
+        rate: calculateRate(startTime, processed)
       });
 
       // Force garbage collection between batches
@@ -670,9 +723,8 @@ async function importMissingProducts(prodConnection, localConnection, missingPid
             .join(",");
           await localConnection.query(
             `
-            INSERT INTO product_categories (cat_id, pid)
+            INSERT IGNORE INTO product_categories (cat_id, pid)
             VALUES ${catPlaceholders}
-            ON DUPLICATE KEY UPDATE cat_id = VALUES(cat_id)
             `,
             validRelationships.flat()
           );