Async improvements #100
Description
Add action log in DB
We can not trace previously updated messages. Add one log entry in the DB for each updated messages.
Add a fail queue
- add failure counts for each message
- if failure counts greater than threshold, put in fail queue.
Or else, async daemon will continuously try and fail on the same error.
Multi-thread not only SNSPocket.home_timeline but also Platform.home_timeline
the current async pocket takes sync version of home_timeline in a batch. If one channel get stuck, others are also stuck.