Ruby on Rails

In Rails 4.2, is there a place where I can put code that I want to be
called immediately after the rails server starts up (as opposed to when
an HTTP request comes in). In other words, I want my code executed
right after I do a "rails server" command or a "heroku restart."

As one simple example, suppose I wanted to maintain an item in the
database that would simply count system reloads. Where would that code
go?

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