Unique Constraint Over Multiple Columns

In a more modern syntax, it would be :

@Table(
    name="ACTIVE_BAND", 
    uniqueConstraints =
        [UniqueConstraint(
                columnNames = ["active_band_user", "active_band_date"]
        )]
)

There is no Hibernate annotation that checks uniqueness before insert/update. But there is annotation which will generate such a constraint to database if automatic database creation is used:

 @Table(
    name="ACTIVE_BAND", 
    uniqueConstraints=
        @UniqueConstraint(columnNames={"active_band_user", "active_band_date"})
)