Locking a Report from changes

In our standard app there is a Sales table.  The default report has a field for Salesperson.  This field is one of the dynamic filters on the report. 

Every few months, I get notified that "Quickbase is not working".  What is happening is that someone has managed to change the default filters within the Sales table default report to look for Salesperson X rather than using the dynamic filter on the report page.

Question #1: Is there a way to restrict someone from going into the default report and making changes?  (Kind of like making a document "Read Only" in Word)  I don't want to change permissions or restrict a field that is used in a lot of reports.

Question #2: Is there a way to go in and see who has changed and saved the report? (So that I can talk to them, if the same person is responsible)

Background: I don't use the Sales table in my day-to-day but have become the default Quickbase problem solver of the office.  Which is why people are notifying me that the report isn't "working".  It's not a big deal, but does interrupt my day as it becomes my priority when I'm told the entire app isn't working only to find out it's this small issue.