pds/app/Models/ProductionPlan.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Prunable;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\SoftDeletes;

class ProductionPlan extends Model
{
    use Prunable;
    use SoftDeletes;

    protected $fillable = [
        'plant_id',
        'shift_id',
        'line_id',
        'plan_quantity',
        'production_quantity',
        'operator_id',
        'created_at',
        'updated_at',
    ];

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

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

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

    public function prunable(): Builder
    {
        return static::where('created_at', '<=', now()->subMonthsNoOverflow(6));
    }
}