You are not meant to concern yourself with the way that Calibre stores books within its library. Think of it as a database and you would not be trying to play around with records within that database.
You have complete control over the naming system that is used when you EXPORT books from the calibre library (database). However that would tend to go astray if the right fields do not contain the expected types of data.
Yes - calibre would allow you do what you requested, but you should be seriously questioning WHY you are thinking of doing it.
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