Redo analytics page

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

@@ -21,20 +21,30 @@ BEGIN
     RAISE NOTICE 'Running % module. Start Time: %', _module_name, _start_time;
 
     -- 1. Calculate Average Lead Time
+    -- For each completed PO, find the earliest receiving from the same supplier
+    -- within 180 days, then average those per-PO lead times per product.
     RAISE NOTICE 'Calculating Average Lead Time...';
-    WITH LeadTimes AS (
+    WITH po_first_receiving AS (
         SELECT
             po.pid,
-            -- Calculate lead time by looking at when items ordered on POs were received
-            AVG(GREATEST(1, (r.received_date::date - po.date::date))) AS avg_days -- Use GREATEST(1,...) to avoid 0 or negative days
+            po.po_id,
+            po.date::date AS po_date,
+            MIN(r.received_date::date) AS first_receive_date
         FROM public.purchase_orders po
-        -- Join to receivings table to find actual receipts
-        JOIN public.receivings r ON r.pid = po.pid
-        WHERE po.status = 'done' -- Only include completed POs
-          AND r.received_date >= po.date -- Ensure received date is not before order date
-          -- Optional: add check to make sure receiving is related to PO if you have source_po_id
-          -- AND (r.source_po_id = po.po_id OR r.source_po_id IS NULL)
-        GROUP BY po.pid
+        JOIN public.receivings r
+            ON r.pid = po.pid
+            AND r.supplier_id = po.supplier_id              -- same supplier
+            AND r.received_date >= po.date                   -- received after order
+            AND r.received_date <= po.date + INTERVAL '180 days' -- within reasonable window
+        WHERE po.status = 'done'
+        GROUP BY po.pid, po.po_id, po.date
+    ),
+    LeadTimes AS (
+        SELECT
+            pid,
+            ROUND(AVG(GREATEST(1, first_receive_date - po_date))) AS avg_days
+        FROM po_first_receiving
+        GROUP BY pid
     )
     UPDATE public.product_metrics pm
     SET avg_lead_time_days = lt.avg_days::int