Separate Notification Store from Content Store

[Mfg]

Hello,

We have lot of schedules and our Content store and Notification store uses same database.


Now we want to assign new database for Notification store. How we suppose to get all the previous Notification store data?
Y because By creating new database and assigning to Notification store will remove history of the Notification store (My understanding)

Thanks in advance,
Mfg