To ensure users do not accidently delete data (has has now just happened on 2000 of our sheets!) - suggest either in the "report" functionality, users are provided a warning that a cascade update or delete will occur does the user want to continue, or rename the report function to be "bulk update" and provide a read only render display of data as "reports" are commonly known as. Also - in its current state having the ability for all users to bulk update data across any sheet via the "reporting" function is extremely powerful and should have security controls.