laravel-backend/app/Repositories/Summary.php

<?php

namespace App\Repositories;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Webmozart\Assert\Assert;

class Summary extends Model
{
	protected $guarded = ['id'];

    public function member(): BelongsTo
    {
        return $this->belongsTo(Member::class);
    }

    protected static function booted()
    {
        static::created(fn (self $summary) => static::cascadeAttributes($summary));
        static::updated(fn (self $summary) => static::cascadeAttributes($summary));
        static::deleting(fn (self $summary) => static::cascadeAttributes($summary));
    }

    /**
     * @todo extract to generic subsystem
     */
    private static function cascadeAttributes(self $summary): void
    {
        static::maybeCascadeAttribute($summary, 'updated_at', 'member', 'updated_at');
    }

    /**
     * @todo extract to generic subsystem
     */
    private static function maybeCascadeAttribute(
        self $summary,
        string $sourceAttribute,
        string $relationship,
        string $targetAttribute
    ): void
    {
        $target = $summary->{$relationship} ?? null;

        if (is_null($target)) {
            return;
        }

        /** @var Model $target */
        Assert::isAOf($target, Model::class);

        $target->withoutEvents(fn () => static::cascadeAttribute($summary, $target, $sourceAttribute, $targetAttribute));
    }

    /**
     * @todo extract to generic subsystem
     */
    private static function cascadeAttribute(self $summary, Model $target, string $sourceAttribute, string $targetAttribute): void
    {
        $target->update([
            $targetAttribute => $summary->{$sourceAttribute},
            'timestamps' => false,
        ]);
    }
}