Refactor code for improved readability and maintainability across multiple files

main.py

@@ -8,7 +8,6 @@ from typing import List
 from fastapi import FastAPI, File, HTTPException, UploadFile
 from fastapi.middleware.cors import CORSMiddleware
 
-# Configure logging
 from ai_rules import AIRule
 from api_models import (
     DocumentProcessResponse,
@@ -71,7 +70,7 @@ async def root():
 
 
 @app.post("/transactions/import/csv")
-async def import_transactions_csv(file: UploadFile = File(...)):
+async def import_transactions_csv(file: UploadFile = File(...), user_id: str = "", categorization_id: str = ""):
     """
     Import transactions from a CSV file (custom bank export format).
     """