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Context: My builds failed related to database configuration (`ActiveRecord::DatabaseConfigurations::DatabaseNotDefined: Database configuration "'default'" not defined`). The default `config/database.yml` included a complex multi-database production setup that was incompatible with Render's standard `DATABASE_URL` environment variable approach.
Resolution: I simplified the `production:` block in `config/database.yml` to inherit defaults and rely solely on the `DATABASE_URL` environment variable provided by Render (e.g., `production:
  <<: *default
  url: <%= ENV['DATABASE_URL'] %>`). Rails 7+ often handles `DATABASE_URL` automatically if the production block is simple enough or just inherits defaults.
Learning: For standard PaaS deployments (like Render, Heroku), I learned to configure the `production` database section in `config/database.yml` to use the `DATABASE_URL` environment variable provided by the host. Avoid complex hardcoded setups unless explicitly needed and configured on the host. Rely on Rails conventions.

Learned on (YYYY-MM-DD)

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