Refactor code structure for improved readability and maintainability

services/logic/app/core.py

@@ -0,0 +1,18 @@
+from functools import lru_cache
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    database_url: str = "postgresql+psycopg://train_watcher:train_watcher@localhost:5432/train_watcher"
+    service_token: str = "dev-service-token-change-me"
+
+    model_config = SettingsConfigDict(env_file=".env", extra="ignore")
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()
+
+
+settings = get_settings()