As @Vadim said StorjLabs is a real service with real users, and it has nothing to do with mining.
Network usage does vary depending on what they do, if new users join or leave the network, and if tests are being conducted or not.
Some months are great, some months are average, and some months there isn’t much going on.
It varies from day to day. As long as there is at least a little bit of activity and your indicators (suspension/audit/online scores) are okay, your node is probably fine.
Well there are ways to fix malformed/locked databases (yours doesn’t seem malformed though), you can search the forum.
But it’d be great to know why it is locked in the first place…