Add initial Todo items and CalDAV sync

app/Models/Todo.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Todo extends Model
+{
+    use HasFactory;
+
+    protected $primaryKey = 'id';
+    public $incrementing = false;
+    protected $keyType = 'string';
+
+    // Wir verwalten created_at / last_modified manuell
+    public $timestamps = false;
+
+    protected $fillable = [
+        'id',
+        'etag',
+        'title',
+        'description',
+        'type_id',
+        'url',
+        'due_date',
+        'recurring',
+        'priority',
+        'status',
+        'created_at',
+        'last_modified',
+        'parent',
+        'object',
+    ];
+
+    protected $casts = [
+        'due_date' => 'datetime',
+        'created_at' => 'datetime',
+        'last_modified' => 'datetime',
+    ];
+
+    public function type()
+    {
+        return $this->belongsTo(TodoType::class, 'type_id');
+    }
+
+    public function parentTodo()
+    {
+        return $this->belongsTo(self::class, 'parent');
+    }
+
+    public function children()
+    {
+        return $this->hasMany(self::class, 'parent');
+    }
+}

app/Models/TodoType.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class TodoType extends Model
+{
+    use HasFactory;
+
+    protected $fillable = ['name'];
+
+    public $timestamps = false;
+
+    public function todos()
+    {
+        return $this->hasMany(Todo::class, 'type_id');
+    }
+}