Update calculate scripts and routes for PO table split

inventory-server/scripts/metrics-new/calculate_vendor_metrics.sql

@@ -45,19 +45,26 @@ BEGIN
         GROUP BY p.vendor
     ),
     VendorPOAggregates AS (
-        -- Aggregate PO related stats
+        -- Aggregate PO related stats including lead time calculated from POs to receivings
         SELECT
-            vendor,
-            COUNT(DISTINCT po_id) AS po_count_365d,
-            AVG(GREATEST(1, CASE WHEN last_received_date IS NOT NULL AND date IS NOT NULL THEN (last_received_date::date - date::date) ELSE NULL END))::int AS avg_lead_time_days_hist -- Avg lead time from HISTORICAL received POs
-        FROM public.purchase_orders
-        WHERE vendor IS NOT NULL AND vendor <> ''
-          AND date >= CURRENT_DATE - INTERVAL '1 year' -- Look at POs created in the last year
-          AND status = 'received' -- Only calculate lead time on fully received POs
-          AND last_received_date IS NOT NULL
-          AND date IS NOT NULL
-          AND last_received_date >= date
-        GROUP BY vendor
+            po.vendor,
+            COUNT(DISTINCT po.po_id) AS po_count_365d,
+            -- Calculate lead time by averaging the days between PO date and receiving date
+            AVG(GREATEST(1, CASE 
+                WHEN r.received_date IS NOT NULL AND po.date IS NOT NULL 
+                THEN (r.received_date::date - po.date::date) 
+                ELSE NULL 
+            END))::int AS avg_lead_time_days_hist -- Avg lead time from HISTORICAL received POs
+        FROM public.purchase_orders po
+        -- Join to receivings table to find when items were received
+        LEFT JOIN public.receivings r ON r.pid = po.pid
+        WHERE po.vendor IS NOT NULL AND po.vendor <> ''
+          AND po.date >= CURRENT_DATE - INTERVAL '1 year' -- Look at POs created in the last year
+          AND po.status = 'done' -- Only calculate lead time on completed POs
+          AND r.received_date IS NOT NULL
+          AND po.date IS NOT NULL
+          AND r.received_date >= po.date
+        GROUP BY po.vendor
     ),
     AllVendors AS (
         -- Ensure all vendors from products table are included