Discord Team dev. article references:
Ch1 : https://discord.com/blog/how-discord-stores-billions-of-messages
Ch2 : https://discord.com/blog/how-discord-stores-trillions-of-messages

I'm just following what Discord team has made and what problems they encountered.

My articles --->
Ch1 : https://wandering-marlin-2dc.notion.site/Following-Discord-73b7211700364f599bcde3f574735279
In the process of finalizing and reviewing!!