classDiagram
    class Trailer {
        +int id
        +string name
    }

    class TrailerReservation {
        +int id
        +int trailer_id
        +date start_date
        +date end_date
        +string time_desc
        +string usage
        +int user_id_applicant
        +int user_id_confirmation
        +datetime created_at
    }

    class User {
      ...
    }

    TrailerReservation "*" -- "1" Trailer
    TrailerReservation "*" -- "1" User : applicant
    TrailerReservation "*" -- "0..1" User : confirmed_by