Refactoring code for modular approach

app/api/v1/stats.py

@@ -1,13 +1,15 @@
 from typing import List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query, BackgroundTasks
+from sqlalchemy import func
 from sqlalchemy.orm import Session
 from app.core.database import get_db
 from app.api.deps import get_current_user
 from app.tasks.background_tasks import process_marketplace_import
 from middleware.decorators import rate_limit
-from models.api_models import MarketplaceImportJobResponse, MarketplaceImportRequest
-from models.database_models import User, MarketplaceImportJob, Shop
+from models.api_models import MarketplaceImportJobResponse, MarketplaceImportRequest, StatsResponse, \
+    MarketplaceStatsResponse
+from models.database_models import User, MarketplaceImportJob, Shop, Product, Stock
 from datetime import datetime
 import logging