Fix calculate errors

inventory-server/scripts/metrics/vendor-metrics.js

@@ -218,6 +218,7 @@ async function calculateVendorMetrics(startTime, totalProducts, processedCount,
                 JOIN orders o ON p.pid = o.pid
                 WHERE o.canceled = false
                     AND o.date >= DATE_SUB(CURRENT_DATE, INTERVAL 12 MONTH)
+                    AND p.vendor IS NOT NULL
                 GROUP BY p.vendor, YEAR(o.date), MONTH(o.date)
             ),
             monthly_po AS (
@@ -238,6 +239,7 @@ async function calculateVendorMetrics(startTime, totalProducts, processedCount,
                 FROM products p
                 JOIN purchase_orders po ON p.pid = po.pid
                 WHERE po.date >= DATE_SUB(CURRENT_DATE, INTERVAL 12 MONTH)
+                    AND p.vendor IS NOT NULL
                 GROUP BY p.vendor, YEAR(po.date), MONTH(po.date)
             )
             SELECT 
@@ -248,7 +250,7 @@ async function calculateVendorMetrics(startTime, totalProducts, processedCount,
                 COALESCE(mp.late_orders, 0) as late_orders,
                 COALESCE(mp.avg_lead_time_days, 0) as avg_lead_time_days,
                 COALESCE(mp.total_purchase_value, 0) as total_purchase_value,
-                COALESCE(mo.total_revenue, 0) as total_revenue,
+                mo.total_revenue,
                 CASE 
                     WHEN mo.total_revenue > 0 
                     THEN (mo.total_margin / mo.total_revenue) * 100 
@@ -258,6 +260,22 @@ async function calculateVendorMetrics(startTime, totalProducts, processedCount,
             LEFT JOIN monthly_po mp ON mo.vendor = mp.vendor 
                 AND mo.year = mp.year 
                 AND mo.month = mp.month
+            UNION
+            SELECT 
+                mp.vendor,
+                mp.year,
+                mp.month,
+                mp.total_po as total_orders,
+                mp.late_orders,
+                mp.avg_lead_time_days,
+                mp.total_purchase_value,
+                0 as total_revenue,
+                0 as avg_margin_percent
+            FROM monthly_po mp
+            LEFT JOIN monthly_orders mo ON mp.vendor = mo.vendor 
+                AND mp.year = mo.year 
+                AND mp.month = mo.month
+            WHERE mo.vendor IS NULL
             ON DUPLICATE KEY UPDATE
                 total_orders = VALUES(total_orders),
                 late_orders = VALUES(late_orders),