====== NotificationEntity ======
[[ru:dsp:airlay:backend|Backend]]  

**Структура NotificationEntity :**
    "_id" : ObjectId,
    "userId" : ObjectId,
    "tool" : object ({"type" : "editor"} | {"type" : "task", "taskId" : ObjectId}),
    "type" : string (Если tool "task" ("owner" | "observer") если "editor" ("info" | "error" | "succes")),
    "message" : string