[+] improve typing

deps/test-task-2025-06-30-v1/python/online/fxreader/pr34/test_task_2025_06_30_v1/tickers/settings.py

@@ -0,0 +1,17 @@
+import pydantic
+import pydantic_settings
+
+from typing import (ClassVar, Optional,)
+
+
+class Settings(pydantic_settings.BaseSettings):
+	db_url : str
+
+	_singleton : ClassVar[Optional['Settings']] = None
+
+	@classmethod
+	def singleton(cls) -> 'Settings':
+		if cls._singleton is None:
+			cls._singleton = Settings.model_validate({})
+
+		return cls._singleton