I'm currently looking at creating a follower db of a live production database. The follower will be used for analytics purposes only. And will not be inserting any data - if it did then it would be by mistake.
After reading the docs on heroku https://devcenter.heroku.com/articles/heroku-postgres-follower-databases#create-a-follower
I cannot see how you could prevent changes from a follower creeping back into the master db.
Any suggestions or pointers will be very helpful. Thank you.