trainer
    id
    name
    phone
    email
    password
    active

room
    id
    name
    seats

event_type
    id
    type
    created_at
    updated_at

event
    id
    start
    end
    id_room
    id_trainer
    id_type
    seats_reserved
    created_at
    updated_at

event_registration
    id
    id_event
    id_customer
    status
    created_at
    canceled_at