Mysql Database Expert for Joomla

I have an adult website that has been running for about 6 years. During that time the database has orphaned tables and some corrupt tables. I need someone that is absolutley familiary with how the database structure is used in Joomla and can sort out the problems with the tables. As an example in the articles in a certain category of the database the numbering has become corrupt. Articles will number for example: 1 2 3 4 5 6 6 6 6 7 8 9 10 Renumbering has not fixed it so I need someone with technical experience pulling apart the databse to see what is going on.