And not the last thing is security and permissions to access different parts of data. I see no way to have it easily implemented in the event logging system.
Chmod? Seriously, if you need different permissions to stres in an event log, just write multiple event logs - each with only the data they need - and store them with different permissions. This assumes that they can be properly decoupled, but since you're the one writing the event log, you can set it up however you want.
