Ayuda para diseño de base de datos -- 2

We need someone to aid us for a creation of 6/7 new database tables with the corresponding REST API, for an existing app. The REST API will be done by our team but we want advice on table creation and database design because in this particular case, having the relations made with good practice and the database normalisation is of paramount importance. At the moment we are working with MySQL but, since this is kind of a side project we are open to using other systems if need be. But for now, we need to design and implement, them. If you think this topic suits you we can discuss further details and go forward. Hablar español es un requisito. SPEAKING SPANISH IS MANDATORY.