Sample project as complement to manual - exists?

[Richard Owlett]

About a week ago I was pointed to recutils as appropriate tool for a 
personal project. I've completed an initial reading of the manual
 [https://www.gnu.org/software/recutils/manual/html_node/index.html].

Although there are many examples of individual commands, I'm looking for 
a sample project to serve as an example of project workflow.

In my case I be starting with 2 single page spreadsheets which will be 
exported in CSV format whose purpose will be tracking the nutrient 
content of what I eat. One file would be the nutrient content of 
individual foods. The other would be a daily log of what was eaten. {An 
inventory control project could have a similar structure.}

Does something like this already exist?

Thank you.