Optimize imports, fix up tracking records and time overall

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

@@ -140,4 +140,24 @@ BEGIN
     ON CONFLICT (module_name) DO UPDATE SET last_calculation_timestamp = _start_time;
 
     RAISE NOTICE 'Finished % calculation. Duration: %', _module_name, clock_timestamp() - _start_time;
-END $$;
+END $$;
+
+-- Return metrics about the update operation for tracking
+WITH update_stats AS (
+    SELECT 
+        COUNT(*) as total_vendors,
+        COUNT(*) FILTER (WHERE last_calculated >= NOW() - INTERVAL '5 minutes') as rows_processed,
+        SUM(product_count) as total_products,
+        SUM(active_product_count) as total_active_products,
+        SUM(po_count_365d) as total_pos_365d,
+        AVG(avg_lead_time_days) as overall_avg_lead_time
+    FROM public.vendor_metrics
+)
+SELECT 
+    rows_processed,
+    total_vendors,
+    total_products::int,
+    total_active_products::int,
+    total_pos_365d::int,
+    ROUND(overall_avg_lead_time, 1) as overall_avg_lead_time
+FROM update_stats;