['required', 'string', 'max:16', Rule::unique('trucks', 'plate_number')->whereNull('deleted_at')], 'model' => ['nullable', 'string', 'max:100'], 'capacity_kg' => ['nullable', 'integer', 'min:0'], 'status' => ['nullable', Rule::in([Truck::STATUS_ACTIVE, Truck::STATUS_MAINTENANCE, Truck::STATUS_RETIRED])], 'notes' => ['nullable', 'string', 'max:1000'], ]; } }