implement bop for expedition must recheck and qty in staff purchase need info

internal/database/migrations/20251204193903_adjustment_purchase_expedition.down.sql

@@ -0,0 +1,30 @@
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1 FROM pg_constraint WHERE conname = 'fk_purchase_items_expense_nonstock'
+    ) THEN
+        ALTER TABLE purchase_items
+            DROP CONSTRAINT fk_purchase_items_expense_nonstock;
+    END IF;
+END $$;
+
+DROP INDEX IF EXISTS idx_purchase_items_expense_nonstock_id;
+
+ALTER TABLE purchase_items
+    DROP COLUMN IF EXISTS expense_nonstock_id,
+    ALTER COLUMN vehicle_number DROP NOT NULL,
+    ALTER COLUMN vehicle_number TYPE VARCHAR USING vehicle_number;
+
+ALTER TABLE purchases
+    ALTER COLUMN pr_number TYPE VARCHAR USING pr_number,
+    ALTER COLUMN po_number TYPE VARCHAR USING po_number,
+    ALTER COLUMN created_at DROP DEFAULT,
+    ALTER COLUMN updated_at DROP DEFAULT;
+
+ALTER TABLE purchases
+    ADD COLUMN credit_term INT NOT NULL DEFAULT 0,
+    ADD COLUMN grand_total NUMERIC(15, 3) NOT NULL DEFAULT 0;
+
+ALTER TABLE purchases
+    ALTER COLUMN credit_term DROP DEFAULT,
+    ALTER COLUMN grand_total DROP DEFAULT;