feat: crud and backups are working

backend/app/crud.py

@@ -0,0 +1,26 @@
+from sqlalchemy.orm import Session
+from app import models, schemas
+
+
+def get_item(db: Session, item_id: int):
+    return db.query(models.Item).filter(models.Item.id == item_id).first()
+
+
+def get_items(db: Session, skip: int = 0, limit: int = 10):
+    return db.query(models.Item).offset(skip).limit(limit).all()
+
+
+def create_item(db: Session, item: schemas.ItemCreate):
+    db_item = models.Item(**item.model_dump())
+    db.add(db_item)
+    db.commit()
+    db.refresh(db_item)
+    return db_item
+
+
+def delete_item(db: Session, item_id: int):
+    item = db.query(models.Item).filter(models.Item.id == item_id).first()
+    if item:
+        db.delete(item)
+        db.commit()
+    return item