Resolve "Add functions to store and retrieve values for calibrating the total number of people and the total structural value"

Laurens Jozef Nicolaas Oostwegelrequested to merge
210-readd-functions-to-store-and-retrieve-values-for-calibrating-the-total-number-of-people-and-the into v25.01

Closes #210 (closed)

\approve @ds @pomodoro

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