Application design update

[rs-anantmishra]

Following deign will be implemented:

Other options explored:

• Add ability to schedule cron jobs to call existing apis on a schedule. This approach still has existing issues like larger channels/playlists cannot be downloaded. Failures are handled badly.
• Using a queue like RabbitMQ will require additional containers, using a lightweight queue like goq will make the system too complex for a single container.
• Using something like pm2/faktory or daemonizing the process will result in loss of queued items unless they're stored in a queue table, which brings us to this implementation.

Something like PM2/Faktory is an amazing later addition once these problems are resolved with this simpler implementation.