Todo-App-Backend/app/Models/UserModel.php

<?php

namespace App\Models;

use CodeIgniter\Model;

class UserModel extends Model
{
    protected $table            = 'users';
    protected $primaryKey       = 'id';
    protected $useAutoIncrement = false;
    protected $returnType       = 'array';
    protected $useSoftDeletes   = false;
    protected $allowedFields    = [
        'id', 'email', 'password_hash', 'name', 'avatar_url',
        'settings', 'created_at', 'updated_at',
    ];

    protected $useTimestamps = true;
    protected $createdField  = 'created_at';
    protected $updatedField  = 'updated_at';

    protected $validationRules = [
        'email' => [
            'rules' => 'required|valid_email|is_unique[users.email]',
            'errors' => [
                'required'    => 'Email is required.',
                'valid_email' => 'Please provide a valid email address.',
                'is_unique'   => 'This email is already registered.',
            ],
        ],
        'name' => [
            'rules' => 'required|max_length[255]',
            'errors' => [
                'required'   => 'Name is required.',
                'max_length' => 'Name must not exceed 255 characters.',
            ],
        ],
    ];
}