Unique class

Unique constraint annotation for single or multiple columns

Can be used on a field for single-column unique constraint, or on the entity class for composite unique constraints.

Example:

// Single column unique
@Unique()
String email;

// Composite unique on entity class
@Entity(tableName: 'user_roles')
@Unique(columns: ['user_id', 'role_id'], name: 'uq_user_role')
class UserRoleEntity { ... }