GAP-2531: Cascade delete grant export tables createdby column

src/main/resources/db/migration/V1_98__cascade_delete_export_rows.sql

@@ -0,0 +1,15 @@
+alter table public.grant_export
+drop constraint grant_export_created_by_fkey,
+add constraint grant_export_created_by_fkey
+    foreign key (created_by)
+    references public.grant_admin (grant_admin_id) match simple
+    on delete cascade
+    on update no action;
+
+alter table public.grant_export_batch
+drop constraint grant_export_batch_created_by_fkey,
+add constraint grant_export_batch_created_by_fkey
+    foreign key (created_by)
+    references public.grant_admin (grant_admin_id) match simple
+    on delete cascade
+    on update no action;