How can I lock down my own database I collect some personal information from users of my website and according to German law, the storage of this data is only allowed with consent of the user. I programmed my site in a way, that the users needs to enter the data via a form, and confirm it via a double opt-in which is send to his email address. So far everything is still compliant with the law. 
But the law also requires from me, that I am able, any time, to prove that the user is really the person who made the entry. 
The double opt-in should be enough, but as I have access to my database, could make entries too. So the question is, how to turn off my own writing rights without being able to get them back. (And how can I prove that I did not have write access ...)
Option 1: Use a different account which have only sufficient permission. Don't use DBA rights account until that is required. 

Option 2 : enable the auditing to track all the changes in databases and made by whom. I hope this will full fill the compliance requirement.