"Write access revoked" on Postgres Hobby Databases
Your Postgres Hobby Databases row limit has been exceeded for more than 7 days and write access has been revoked.
You will still have
delete permissions to your database. You will need to delete the necessary rows from your database to bring it back within compliance of the limits for your plan.
We periodically check for database row limit compliance, but if you have had your write access revoked, it could take up to several hours before permissions are restored.
More information is available here: https://devcenter.heroku.com/articles/heroku-postgres-plans#hobby-tier