Lock Timeline?

I've had a couple of instances where an assistant was supposed to work on something and did not open the correct timeline and made changes, saved them, end of day backed up the project, with the end result being that version of the project was irretrievably lost.
QUESTION: Is there a way to LOCK a timeline so it can be viewed but no changes can be made? I know I could lock video and audio track but I'm hoping there might be a way to lock a specific timeline that would protect everything in one step, including needing permission to unlock it.
QUESTION: Is there a way to LOCK a timeline so it can be viewed but no changes can be made? I know I could lock video and audio track but I'm hoping there might be a way to lock a specific timeline that would protect everything in one step, including needing permission to unlock it.