exchange-2.0/app/Models/WorkflowTimestamp.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class WorkflowTimestamp extends Model
{
    use HasFactory;

    /**
     * The table associated with the model.
     *
     * @var string
     */
    protected $table = 'workflow_timestamps';

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'node',
        'seconds',
        'userId',
        'session_id'
    ];

    /**
     * The attributes that should be cast.
     *
     * @var array
     */
    protected $casts = [
        'timestamp' => 'datetime',
    ];

    /**
     * Get the user that owns the workflow timestamp.
     */
    public function user()
    {
        return $this->belongsTo(User::class, 'userId');
    }
}