Thanks David, Robert and Francesc for comments and suggestions. It's nice having options, but that also means one has to choose ;) I will have a closer look at pytables. The thing that got me "scared" about it was the word database. I have close to zero experience using or, even worst, designing databases. Maybe I am wrong. The way I was considering for structuring could be considered like a, rudimentary at least, database. I have the feeling this is turning into killing a fly with a cannon...
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