To add to what Pavish said, reads are always safe, so you can examine, monitor, make reports and what we call Explorations (our user-friendly spin on Postgres views) of your data without worries. When it comes to adding data and updating it, that can be safe as well in many cases, but definitely should consult with someone that knows the specifics of your application. Schema changes, however, are very likely to break something, hence the permission system Pavish described.