How to delete several related rows under transaction ?

In laravel 11 / livewire 3.5 app I have a form with 2 tables updates : branch and location :

    public static function form(Form $form): Form
    {
        return $form
            ->schema([
                Fieldset::make('Editor')
                    ->schema([
                        TextInput::make('id')->disabled()->dehydrated(false)
                            ->visible(fn(?Branch $record) => $record !== null),
                        TextInput::make('name')->lazy()
                            ->required()
                            ->minLength(3)
                            ->maxLength(100)
                            ->unique(table: Branch::class, column: 'name', ignoreRecord: true)
                            ->live()
                            ->afterStateUpdated(fn(Set $set, ?string $state) => $set('slug', Str::slug($state)))
                            ->autofocus()
                            ->placeholder('Enter name of branch'),
                        TextInput::make('slug')->lazy()
                            ->maxLength(100)
                            ->unique(table: Branch::class, column: 'slug', ignoreRecord: true),
                        Placeholder::make('active_babel')
                            ->label('Status')
                            ->content(fn(?Branch $record) => 'On creation new branch would be inactive')
                            ->visible(fn(?Branch $record) => ($record === null))
                            ->hint('Managers can work only in active branch'),

                        Placeholder::make('active')
                            ->label('Status')
                            ->content(fn(Branch $record
                            ) => BranchActiveEnum::getActiveLabel($record->active))
                            ->visible(fn(?Branch $record
                            ) => ($record !== null))
                            ->hint('Managers can work only in active branch'),
                    ]), // Fieldset::make('Editor')

                /* Block to related Location START */
                Fieldset::make('Location')
                    ->relationship('location')
                    ->schema([
                        TextInput::make('place')->lazy()
                            ->required()
                            ->minLength(3)
                            ->maxLength(100)
                            ->placeholder('Enter place of location'),
                        TextInput::make('lat')->lazy()
                            ->required()
                            ->numeric()
                            ->placeholder('Enter valid lat value'),
                        TextInput::make('lng')->lazy()
                            ->required()
                            ->numeric()
                            ->placeholder('Enter valid lng value '),
                        Select::make('country')->label('Country')
                            ->prefixIcon(getLocationIcon())
                            ->preload()
                            ->options(ProfileHelper::getCountrySelectionItems(false))
                            ->default(ProfileHelper::getDefaultCountry())
                            ->helperText('Select one countries which are used in the app '),
                    ]), // Fieldset::make('Location')
                /* Block to related Location START */

Creating new branch I need to save it under transaction and I managed with this link :

https://filamentphp.com/docs/3.x/panels/configuration#opting-in-to-database-transactions-for-specific-actions-and-pages

as I added line :

protected ?bool $hasDatabaseTransactions = true;

in both create and edit pages. It works, but I have questions :

a) In case of error if rollback would be raised ? b) Checking sql-tracement I see that deleting are not under transaction.

Deleted implemented in branch model :

protected static function boot()
    {
        parent::boot();
        static::deleted(function ($branch) {
            $location = Location::getByModelType(Branch::class)->getByModelId($branch->id)->first();
            if ( ! empty($location)) {
                $location->delete();
            }
        });
    }

As that is morph relation I can not delete rows in db...

Howcan I run deleted under transaction ?