refactor: Centralize database session management in a shared dependency module

routes/scenarios.py

@@ -1,10 +1,12 @@
-from fastapi import APIRouter, Depends, HTTPException
-from sqlalchemy.orm import Session
-from config.database import SessionLocal
-from models.scenario import Scenario
-from pydantic import BaseModel, ConfigDict
-from typing import Optional
 from datetime import datetime
+from typing import Optional
+
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel, ConfigDict
+from sqlalchemy.orm import Session
+
+from models.scenario import Scenario
+from routes.dependencies import get_db
 
 router = APIRouter(prefix="/api/scenarios", tags=["scenarios"])
 
@@ -22,29 +24,15 @@ class ScenarioRead(ScenarioCreate):
     updated_at: Optional[datetime] = None
     model_config = ConfigDict(from_attributes=True)
 
-# Dependency
-
-
-def get_db():
-    db = SessionLocal()
-    try:
-        yield db
-    finally:
-        db.close()
-
-
 @router.post("/", response_model=ScenarioRead)
 def create_scenario(scenario: ScenarioCreate, db: Session = Depends(get_db)):
-    print(f"Creating scenario with name: {scenario.name}")
     db_s = db.query(Scenario).filter(Scenario.name == scenario.name).first()
     if db_s:
-        print(f"Scenario with name {scenario.name} already exists.")
         raise HTTPException(status_code=400, detail="Scenario already exists")
     new_s = Scenario(name=scenario.name, description=scenario.description)
     db.add(new_s)
     db.commit()
     db.refresh(new_s)
-    print(f"Scenario with name {scenario.name} created successfully.")
     return new_s