migration to consolidate allowable weight from weight_tickets in ppm_…

…shipments

migrations/app/migrations_manifest.txt

@@ -999,3 +999,4 @@
 20240910021542_populating_locked_price_cents_from_pricing_estimate_for_ms_and_cs_service_items.up.sql
 20240917132411_update_provides_ppm_closeout_transportation_offices.up.sql
 20240917165710_update_duty_locations_provides_services_counseling.up.sql
+20241008132316_consolidate_allowable_weight_in_ppm_shipments.up.sql

migrations/app/schema/20241008132316_consolidate_allowable_weight_in_ppm_shipments.up.sql

@@ -0,0 +1,20 @@
+SET statement_timeout = 300000;
+SET lock_timeout = 300000;
+SET idle_in_transaction_session_timeout = 300000;
+
+ALTER TABLE ppm_shipments
+ADD COLUMN IF NOT EXISTS allowable_weight integer;
+
+COMMENT on COLUMN ppm_shipments.allowable_weight IS 'Combined allowable weight for all trips.';
+
+-- Backfill values from weight_tickets table
+UPDATE ppm_shipments
+SET allowable_weight = summed_weights.summed_allowable_weight
+FROM (
+	SELECT ppm_shipment_id, SUM(COALESCE(full_weight, 0) - COALESCE(empty_wight, 0)) AS summed_allowable_weight FROM public.weight_tickets
+	GROUP BY ppm_shipment_id
+) AS summed_weights
+WHERE ppm_shipments.id = summed_weights.ppm_shipment_id;
+
+ALTER TABLE weight_tickets
+DROP COLUMN allowable_weight;