create table notification_options (
  key text primary key not null,
  created_at timestamptz not null default now()
);

insert into notification_options (key) values ('always');
insert into notification_options (key) values ('on_failure');
insert into notification_options (key) values ('on_state_change');
insert into notification_options (key) values ('on_state_change_and_failures');
insert into notification_options (key) values ('never');