add authorization and admin role

crud.py

@@ -1,7 +1,19 @@
 from sqlalchemy.orm import Session
-from models import Car, EngineType, HybridType, PowerRatio
+from models import Car, EngineType, HybridType, PowerRatio, Admin
 import schemas
 from typing import List, Optional
+from password_utils import get_password_hash
+
+def get_admin_by_username(db: Session, username: str) -> Optional[Admin]:
+    return db.query(Admin).filter(Admin.username == username).first()
+
+def create_admin(db: Session, admin: schemas.AdminCreate) -> Admin:
+    hashed_password = get_password_hash(admin.password)
+    db_admin = Admin(username=admin.username, hashed_password=hashed_password)
+    db.add(db_admin)
+    db.commit()
+    db.refresh(db_admin)
+    return db_admin
 
 def get_car(db: Session, car_id: int) -> Optional[Car]:
     return db.query(Car).filter(Car.id == car_id).first()