refactor: Centralize database session management in a shared dependency module

routes/reporting.py

@@ -3,21 +3,12 @@ from typing import Any, Dict, List, cast
 from fastapi import APIRouter, HTTPException, Request, status
 from pydantic import BaseModel
 
-from config.database import SessionLocal
 from services.reporting import generate_report
 
 
 router = APIRouter(prefix="/api/reporting", tags=["Reporting"])
 
 
-def get_db():
-    db = SessionLocal()
-    try:
-        yield db
-    finally:
-        db.close()
-
-
 def _validate_payload(payload: Any) -> List[Dict[str, float]]:
     if not isinstance(payload, list):
         raise HTTPException(