Depends on something to push data to redis' pub/sub on the convention of of the following channels: notifications.GENERATED_KEY-OWNER_ID and user.USER_ID
Keys can be static, but you should only store them for at most two weeks before marking them as invalid, this is easily done using a SQL database.
You have two methods of generating new keys, one is resource efficient, the other is processing efficient.
You can either:
- Generate a new key every time the current key is over a certain age. (processing efficient)
- Delete keys that are over a certain age. (resource efficient)