Techniques used in this project

1. Cron jobs
2. SQL pagination 
3. Auto-generated Graphql API client
4. Joystream chain events handling
5. Discord commands
6. Polkadot signature verification
7. Sequelize `declare` trick, see https://github.com/sequelize/sequelize/issues/11032#issuecomment-1002940929 
8. Discord role assigning
9. Sequelize on Heroku: SSL ;) 
10. Two GraphQL APIs consumed. Due to a [bug](https://github.com/Joystream/joystream/issues/4032), I had to split them in separate files.
11. Caching introduced
12. Discord API: Mention server role in embed description