Dear Sir,
I just read your post very carefully and I think that I'm a suitable person for you.
I'm an expert in sql (sql server, mysql, postgresql, and so on) for 9+ years.
and I have many web applications with these databases.
I can write various complex queries including stored procedure.
especially I'm able to desgin database with UML.
please find my portfolio
So, I'm sure that I can complete this job successfully without any mistakes.
Thank you.