refactor: restructure project into layered architecture

backend/services/crud.py

@@ -1,32 +1,61 @@
-from sqlalchemy.orm import Session
-from models import Item
 import random
 
-def get_items(db: Session):
+from sqlalchemy.orm import Session
+
+from app.db.models import Item
+
+
+def get_items(
+    db: Session
+):
+
     return db.query(Item).all()
 
-def create_item(db: Session, title: str):
-    item = Item(title=title)
+
+def create_item(
+    db: Session,
+    title: str
+):
+
+    item = Item(
+        title=title
+    )
 
     db.add(item)
+
     db.commit()
+
     db.refresh(item)
 
     return item
 
-def delete_item(db: Session, item_id: int):
-    item = db.query(Item).filter(Item.id == item_id).first()
+
+def delete_item(
+    db: Session,
+    item_id: int
+):
+
+    item = db.query(Item).filter(
+        Item.id == item_id
+    ).first()
 
     if item:
+
         db.delete(item)
+
         db.commit()
 
     return item
 
-def spin_wheel(db: Session):
+
+def spin_wheel(
+    db: Session
+):
+
     items = db.query(Item).all()
 
     if not items:
+
         return None
 
     return random.choice(items)