Custom model

Subclass the model to add relations or accessors — the package still owns the schema:

use Cbox\Operations\Models\Operation as BaseOperation;

class Operation extends BaseOperation
{
    public function tenant()
    {
        return $this->belongsTo(Tenant::class);
    }
}

// config/operations.php
'models' => [
    'operation' => App\Models\Operation::class,
],

The manager resolves this class for every read and write.