Whether the design of delayed messages should be optimized

[crossoverJie]

When a delayed message is sent that has not yet been acknowledged, a individuallyDeletedMessages is created at this point.

What if it takes a long time, say a year, at which point the message on this topic will be slow to be released?

Should we store normal messages and delayed messages separately?

[lhotari]

You might want to check #16763 and #15500

[crossoverJie]

Got it, thx.