PG:InsufficientPrivilege: ERROR when trying to make an INSERT on stage database
I know it's waaaaay late, but I just ran into this issue and I believe the problem is that you have exceeded the number of rows allowed for your DB. In my case, I was using a Hobby-dev plan and the limit is 10k rows. If you run heroku pg:info you will see something like:
=== HEROKU_POSTGRESQL_BRONZE_URL (DATABASE_URL)Plan: Hobby-devStatus: AvailableConnections: 4/20PG Version: 9.3.3Created: 2014-05-27 15:07 UTCData Size: 175.5 MBTables: 47Rows: 409300/10000 (Write access revoked)Fork/Follow: UnsupportedRollback: UnsupportedWith the Write access revoked being the key piece of information. Upgrading your DB (or deleting some data) should solve this.