Store notifications on every add, delete

components/brave_rewards/browser/rewards_notification_service_impl.cc

@@ -37,7 +37,6 @@ RewardsNotificationServiceImpl::RewardsNotificationServiceImpl(Profile* profile)
 }
 
 RewardsNotificationServiceImpl::~RewardsNotificationServiceImpl() {
-  StoreRewardsNotifications();
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   RemoveObserver(extension_rewards_notification_service_observer_.get());
 #endif
@@ -53,6 +52,7 @@ void RewardsNotificationServiceImpl::AddNotification(
   RewardsNotification rewards_notification(
       id, type, GenerateRewardsNotificationTimestamp(), std::move(args));
   rewards_notifications_[id] = rewards_notification;
+  StoreRewardsNotifications();
   OnNotificationAdded(rewards_notification);
 }
 
@@ -62,11 +62,13 @@ void RewardsNotificationServiceImpl::DeleteNotification(RewardsNotificationID id
     return;
   RewardsNotification rewards_notification = rewards_notifications_[id];
   rewards_notifications_.erase(id);
+  StoreRewardsNotifications();
   OnNotificationDeleted(rewards_notification);
 }
 
 void RewardsNotificationServiceImpl::DeleteAllNotifications() {
   rewards_notifications_.clear();
+  StoreRewardsNotifications();
   OnAllNotificationsDeleted();
 }