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    Steve Lim said about 3 years ago on What's New in Rails 6 :
    Hi David,

    Do you have an idea what could have caused to raise this error PG::InsufficientPrivilege on production env after I updated the db settings?
    I have a Heroku app that is connected to Amazon RDS and when I make the following changes below I am getting  PG::InsufficientPrivilege error on production env.
    Let me know if you have any suggestions?

    Prior to this change, I used Makara gem for splitting DB-r and DB-w.

    production:
  <<: *default
  url: postgresql-makara:///
  makara:
    sticky: true
    connections:
      - role: master
        name: primary
        url: <%= ENV["DATABASE_URL"] %>
      - name: replica
        url: <%= ENV["ANALYTICS_URL"] %>

    and I changed to as follows:

    default: &default
  adapter: postgresql
  encoding: unicode
development:
  primary:
    <<: *default
    database: hot_seller_development
  follower:
    <<: *default
    database: hot_seller_development
    replica: true

production:
  primary:
    <<: *default
    url: <%= ENV['DATABASE_URL'] %>
  follower:
    <<: *default
    url: <%= ENV['ANALYTICS_URL'] %>
    replica: true

    whenever I push this change to production environment, the postgres log in Amazon RDS says,
    "2021-09-28 11:13:06 UTC:ec2-52-XXXX.compute-1.amazonaws.com(57186):ucorXXX@d1XXX:[8428]:LOG: could not receive data from client: Connection reset by peer" <-- this is db with write access (DATABASE_URL)
    2021-09-28 11:14:06 UTC:ec2-XXXXX.compute-1.amazonaws.com(47640):anal@d1octXXXX:[445]:ERROR: permission denied for relation users <-- this is db with read access (ANALYTICS_URL)
    It seems my app is relegated to using db with read access because it could not connect with db with write access..

    If I simply run, 
    ActiveRecord::Base.establish_connection(Rails.application.credentials.fetch :DATABASE_URL)
    on rails console, it works.. So I feel like this could be heroku related...

    I appreciate it if you could offer any suggestions!

    Thanks!

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