Thanks for sharing  ☒ 

 ☒ Do you have <%= stylesheet_pack_tag 'application' %> in the layouts?

 ☒ Since we are using CSS within webpack, (import "cropperjs/dist/cropper.css"), you would also need to add the stylesheet_pack_tag in the application layout. Typically, it would probably be something like this 

<%= stylesheet_pack_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>

 ☒ I haven't had this use case yet, but it makes sense. Have a look at https://devcenter.heroku.com/articles/amazon-rds. It worries me though that they're saying to open the database up to the entire world. It is a security risk in my opinion.

Just to make sure, in your ApplicationRecord class, did you set the connects_to?

connects_to database: { writing: :primary, reading: :follower }