- decoding of open messages

- de- and encoding of messages

- fetch posts for hash replies

- request posts for hash replies
- basic db: save and load of posts
- encode and sign post types text, join and leave

- build out persistence via sqlite
- build out channel and connection state

- complete channel and connection state

  - keep track when and how many messages were processed by each peer

  - implement rate limiting based on bytes transmitted per peer

- create posts

- encode posts:
  - delete
  - info
  - topic
- answer channel time range and channel state based on persisted data