How do I add form validation for complex constraints?

[the4amfriend]

Currently we're faced with ugly DB errors when complex constraints are hit, we'd like to rectify that but I'm not sure how best I can address this.

For example, how do we validate the following in a form?

$table->unique(['name', 'country_id', 'jurisdiction_level_id']);

Here's my form:

        return $form
            ->schema([
                TextInput::make('name')
                    ->required(),

                Select::make('jurisdiction_level_id')
                    ->relationship('jurisdiction_level', 'name')
                    ->searchable(),

                Select::make('country_id')
                    ->relationship('country', 'name')
                    ->searchable()
                    ->required(),
            ]);

Appreciate any advice.