How to recreate users and roles tables?

(sorry for my bad english) I accidently dropped (yeah, I know) the users and roles tables from my Redmine mysql database. All database is still intact. Where can I find the script to re-create those tables? I found the Schema.rb and was creating a SQL script but maybe there is another way (like, somehow execute this schema.rb (I do not know if this is possible))

Thanks for any help :/