update due date and range date

migrations/000074_make_purchase_order_due_date_nullable.down.sql

@@ -0,0 +1,6 @@
+UPDATE purchase_orders
+SET due_date = transaction_date
+WHERE due_date IS NULL;
+
+ALTER TABLE purchase_orders
+    ALTER COLUMN due_date SET NOT NULL;

migrations/000074_make_purchase_order_due_date_nullable.up.sql

@@ -0,0 +1,2 @@
+ALTER TABLE purchase_orders
+    ALTER COLUMN due_date DROP NOT NULL;