Don't hesitate contacting me, i will make it look very easy.
your database class conception will be done by a click.
Just give me what you need
Database is delivered with:
Class Diagram + the schema relational on third Normal Form
Entity Relationship Model diagram + Document describe the Relationship between the element of the system
Document that give you a total step by step installing queries using MySQL or ORACLE.
User case Diagram + Document that describe the functionality of the system
A Step by Step Document that give you finally the ability to extend your data base.(I will give you my experience ,by this step your database will be uniform, you can use it for any app, just flow the instruction in this document.Now you can forget about making a database every time you wont to make an application).
Note for professional : there is many other diagrams here they are: static Diagrams component diagram... Dynamic Diagrams +Communication Diagram +Activity Diagram