Add Class Code and BOMs Used In columns to Unused Items page

- Join classcode table for class code display
- Subquery bomitem for count of distinct parent BOMs each item appears in
- Add both columns to table widget between Item Type and Created By

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pages/Operations - Unused Items/queries/unused_items/unused_items.txt

@@ -12,11 +12,19 @@ SELECT
         WHEN 'F' THEN 'Phantom'
         ELSE i.item_type
     END AS "Item Type",
+    clc.classcode_code AS "Class Code",
+    COALESCE(bom_count.num_boms, 0) AS "BOMs Used In",
     cc.comment_user AS "Created By",
     COALESCE(i.item_created, cc.comment_date)::date AS "Date Created",
     last_txn.last_transaction_date::date AS "Last Transaction",
     (CURRENT_DATE - COALESCE(last_txn.last_transaction_date, i.item_created, cc.comment_date)::date) AS "Days Unused"
 FROM item i
+LEFT JOIN classcode clc ON clc.classcode_id = i.item_classcode_id
+LEFT JOIN (
+    SELECT bomitem_item_id, COUNT(DISTINCT bomitem_parent_item_id) AS num_boms
+    FROM bomitem
+    GROUP BY bomitem_item_id
+) bom_count ON bom_count.bomitem_item_id = i.item_id
 LEFT JOIN comment cc
     ON cc.comment_source_id = i.item_id
     AND cc.comment_source = 'I'