Nice work blade!
If you're using a MySQL database you can start the auto_increment field at 100000000 (make sure it's an unsigned int field). When creating a new account, once you insert the user you can use LAST_INSERT_ID() on the table to find the last id you inserted so you can display it to the user.
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04' Dodge SRT-4, Mopar Stage 3, 406whp/436wtq
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