Activity object and display object limited to Varchar(255)

The activity fields object and displayobject are set to @Column.
Being String fields, they get limited to varchar(255) size.

If a document title is bigger than 256 chars it won't create an activity.
If we want to use the minimessages to create larger messages it will be stuck to 256 chars.
If we create a new verb for fullmessages or any other type of activity that uses the object field properly it will be limited to VARCHAR(255).