ActiveRecord::Base - set short timeouts for production queries, nothing end-users do should be taking this long

database.yml

# Do not suffer slow queries in production:
aggressive_timeout_settings: &aggressive_timeout_settings
  adapter: postgresql
  encoding: unicode
  connect_timeout:  1 # second - network handshake time
  checkout_timeout: 1 # second - connection pool checkout wait time
  variables:
    statement_timeout: 2500 # ms - maximum time for a single SQL query

production:
  <<: *aggressive_timeout_settings
  username: ..
  database: ...