Store the albums read by the readers.

[The4thLaw]

Thanks to the implementation of #4, we now have proper reading lists.

It would be nice to store the list of albums read by readers, and when (= last time it was read) and how many times they read it. This way, we could suggest them to re-read some albums they have not read for a while, for example (this would be another issue).

This is pretty low priority.