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The pg_stat_activity data showed a lot of idle connections. This affects the total number of database connections available which resulted in production incidents during the weekend. > reaping_frequency: frequency in seconds to periodically run the Reaper, which attempts to find and recover connections from dead threads, which can occur if a programmer forgets to close a connection at the end of a thread or a thread dies unexpectedly. Regardless of this setting, the Reaper will be invoked before every blocking wait. (Default nil, which means don't schedule the Reaper). Ref: https://api.rubyonrails.org/v5.1/classes/ActiveRecord/ConnectionAdapters/ConnectionPool.html