In this release, the models have been refactored in a way that the alternate constructors are now `classmethods` and now more easy to read and the definition of now public and private methods are well defined. An important change to note is that some arguments have changed, all the ids are now something like: `manga_id`, `user_id`, etc. This si to avoid conflict with the reserved keyword `id` n python and to have a more self-explanatory code.