The default lifetime of notification messages is 30 days, after which messages are deleted from the database, regardless of read status.
To change this value, add or edit this line in
java.notifications_lifetime = 30
All notification types are enabled by default.
To disable a notification type, add or edit this line in
java.notifications_type_disabled = OnboardingFailed,ChannelSyncFailed,ChannelSyncFinished