Accidental writeback to database risk "admin has granted access, credentials are not required"?

Just wanted to say how much i appreciate the responses by the way, the reason i checked is that the reports i am being asked to do are getting more and more complicated- with multiple data sources, combined columns, dax calculated columns and- a heck of a lot of data transformation in power query.  It suddenly hit me that i had never checked that only the imported data is being transformed.

I hope that with more experience i can repay the favours to the helpful people here.