app/Models/ChatConversation.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class ChatConversation extends Model
{
    use HasFactory;

    protected $fillable = [
        'user_id',
        'title',
        'openai_thread_id',
    ];

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

    public function messages(): HasMany
    {
        return $this->hasMany(ChatMessage::class)->orderBy('id');
    }
}