Allow to report the database reference

[fidalgo]

From the guides https://guides.rubyonrails.org/active_record_multiple_databases.html on multiple databases, we have the following database.yml file:

production:
  primary:
    database: my_primary_database
    user: root
    adapter: mysql
  primary_replica:
    database: my_primary_database
    user: root_readonly
    adapter: mysql
    replica: true
  animals:
    database: my_animals_database
    user: animals_root
    adapter: mysql
    migrations_paths: db/animals_migrate
  animals_replica:
    database: my_animals_database
    user: animals_readonly
    adapter: mysql
    replica: true

I would like to signal which database the query is running. Given the replicas have the same database name, the database comment on marginalia won't work. Is it possible to add the animals and animals_replica names to the comments?