Add QOH column to Unused Items page

Sum itemsite_qtyonhand across all itemsites per item.

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

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

@@ -14,6 +14,7 @@ SELECT
     END AS "Item Type",
     clc.classcode_code AS "Class Code",
     COALESCE(bom_count.num_boms, 0) AS "BOMs Used In",
+    COALESCE(qoh.qty_on_hand, 0) AS "QOH",
     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",
@@ -25,6 +26,11 @@ LEFT JOIN (
     FROM bomitem
     GROUP BY bomitem_item_id
 ) bom_count ON bom_count.bomitem_item_id = i.item_id
+LEFT JOIN (
+    SELECT itemsite_item_id, SUM(itemsite_qtyonhand) AS qty_on_hand
+    FROM itemsite
+    GROUP BY itemsite_item_id
+) qoh ON qoh.itemsite_item_id = i.item_id
 LEFT JOIN comment cc
     ON cc.comment_source_id = i.item_id
     AND cc.comment_source = 'I'