added migration seeders models and test script

app/Models/TodoModel.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+class TodoModel extends Model
+{
+    use LoggableTrait;
+
+    protected $table = 'todos';
+    protected $primaryKey = 'id';
+    protected $useAutoIncrement = false;
+    protected $returnType = 'array';
+    protected $useSoftDeletes = false;
+    protected $allowedFields = [
+        'id',
+        'user_id',
+        'title',
+        'description',
+        'status',
+        'due_date',
+        'due_time',
+        'sync_enabled',
+        'reminder_enabled',
+        'recurring_enabled',
+        'project_id',
+        'created_at',
+        'updated_at',
+    ];
+
+    protected $useTimestamps = true;
+    protected $createdField = 'created_at';
+    protected $updatedField = 'updated_at';
+
+    protected $validationRules = [
+        'user_id' => 'required',
+        'title' => 'required|max_length[255]',
+        'status' => 'permit_empty|in_list[open,in_progress,completed,archived]',
+    ];
+
+    protected function getEntityType(): string
+    {
+        return 'todo';
+    }
+
+    // Get todos with categories
+    public function getWithCategories($todoId = null)
+    {
+        $builder = $this->select('todos.*, GROUP_CONCAT(categories.name) as category_names')
+                        ->join('todo_categories', 'todos.id = todo_categories.todo_id', 'left')
+                        ->join('categories', 'todo_categories.category_id = categories.id', 'left')
+                        ->groupBy('todos.id');
+
+        if ($todoId) {
+            $builder->where('todos.id', $todoId);
+        }
+
+        return $builder->get()->getResultArray();
+    }
+
+    // Get todos by user with categories
+    public function getByUserWithCategories($userId)
+    {
+        return $this->select('todos.*, GROUP_CONCAT(categories.name) as category_names')
+                    ->join('todo_categories', 'todos.id = todo_categories.todo_id', 'left')
+                    ->join('categories', 'todo_categories.category_id = categories.id', 'left')
+                    ->where('todos.user_id', $userId)
+                    ->groupBy('todos.id')
+                    ->get()
+                    ->getResultArray();
+    }
+}