LAR_Maintenance/app/Livewire/MaintenanceHistory/Form.php

<?php
namespace App\Livewire\MaintenanceHistory;

use Livewire\Component;
use App\Models\MaintenanceHistory;

class Form extends Component
{
    public $model;
    public string $maintenance_id;
	public string $start_at;
	public string $finished_at;

    public $action = 'store';

    protected function rules()
    {
        return [
            'maintenance_id' => 'required',
			'start_at' => 'required',
			'finished_at' => 'required',
        ];
    }

    public function mount ($model = null){
        if (!empty($model)) {
            $maintenanceHistory = MaintenanceHistory::find($model);

            $this->model = $model;

            $this->maintenance_id = $maintenanceHistory->maintenance_id;
			$this->start_at = $maintenanceHistory->start_at;
			$this->finished_at = $maintenanceHistory->finished_at;

            $this->action = 'update';
        }
    }

    public function store()
    {
        $validatedData = $this->validate();
        MaintenanceHistory::create($validatedData);
        $this->dispatch('closeModal');
    }

    public function update()
    {
        $validatedData = $this->validate();
        $maintenanceHistory = MaintenanceHistory::find($this->model);
        if (!empty($maintenanceHistory)) {
            $maintenanceHistory->update($validatedData);
        }
        $this->dispatch('closeModal');
    }

    public function render()
    {
        return view('livewire.components.maintenance-history.form');
    }
}