Implemented "/user update_channels" (#10)

modules/utils/event_utils.py

@@ -1,5 +1,5 @@
 from datetime import datetime
-from typing import Any, Dict
+from typing import Any, Dict, Optional
 from zoneinfo import ZoneInfo
 
 from bson import ObjectId
@@ -13,9 +13,9 @@ from modules.database import col_events
 async def validate_event_validity(
     ctx: ApplicationContext,
     name: str,
-    start_date: datetime | None,
-    end_date: datetime | None,
-    event_id: ObjectId | None = None,
+    start_date: datetime,
+    end_date: datetime,
+    event_id: Optional[ObjectId] = None,
     to_utc: bool = False,
 ) -> bool:
     start_date_internal: datetime = start_date.astimezone(ZoneInfo("UTC")) if to_utc else start_date