Revert "minor change"

This reverts commit b0028534474d6b0f041836264658994c15747b85.

src/utils/config.py

@@ -62,6 +62,12 @@ class Settings(BaseSettings):
         description="FastAPI port number (Hugging Face default)"
     )
     
+    # Database Configuration (PostgreSQL - Deprecated in favor of Firebase)
+    database_url: str = Field(
+        default="postgresql+asyncpg://postgres:password@localhost:5432/studynotes",
+        description="PostgreSQL database connection URL (Deprecated)"
+    )
+    
     # Firebase Configuration
     firebase_project_id: str = Field(
         default="aidea-project-id",