You can lock topics from the topic tools menu
Moderators can access the flagged content page at /flags
I guess additional information would be great:
Are you trying to do this on a regular basis? Then you should consider writing/asking for a plugin.
If not the database-type would be clearly helpful (as long as NodeBB doesn't deliver such functionality yet).
In each case the NodeBB version wouldn't be wrong to share
I won't be able to give further help, just assuming those who would be able to would need that information
Temporarily I solved using Redis Commander https://joeferner.github.io/redis-commander/ and http://www.epochconverter.com/ for timestamp in milliseconds
I think a plugin would be more user friendly
Is there any improvements regarding this feature?