refactor: Centralize database session management in a shared dependency module

routes/production.py

@@ -4,21 +4,11 @@ from fastapi import APIRouter, Depends, status
 from pydantic import BaseModel, ConfigDict, PositiveFloat
 from sqlalchemy.orm import Session
 
-from config.database import SessionLocal
 from models.production_output import ProductionOutput
+from routes.dependencies import get_db
 
 
 router = APIRouter(prefix="/api/production", tags=["Production"])
-
-
-def get_db():
-    db = SessionLocal()
-    try:
-        yield db
-    finally:
-        db.close()
-
-
 class ProductionOutputBase(BaseModel):
     scenario_id: int
     amount: PositiveFloat