Redmine: Database table returcture in plugin

ruby script/rails d redmine_plugin_model Dods dod name:string description:string user:string created_at:timestamp created_by:string dod_to:string duration:integer
rake db:rollback
delete last migration
and table from db

ruby script/rails g redmine_plugin_model Dods dod name:string description:string created_at:timestamp created_by:string dod_to:string duration:integer

rake redmine:plugins:migrate