Example "freewheeling" app that can be modified without restarting; useful starting point for further forks

remove abstraction: update_head

If we're only going to use it in roll_forward/roll_back it's not really worth the trouble.

Now the code inside roll_forward/roll_back reads all at one level of abstraction.

Created by  Kartik K. Agaram  on April 9, 2023
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