diff --git a/app/models.py b/app/models.py
index 0045b72..65474e3 100644
--- a/app/models.py
+++ b/app/models.py
@@ -11,3 +11,40 @@ class Book(Base):
     title = Column(String(255), nullable=False)
     author = Column(String(255), nullable=False)
     pages_count = Column(Integer, nullable=True)
+
+
+# Список книжок (мокові дані)
+books = [
+    Book(id=1, title="Book 1", author="Author 1", pages_count = 'pages_count1'),
+    Book(id=2, title="Book 2", author="Author 2", pages_count = 'pages_count2'),
+    Book(id=3, title="Book 3", author="Author 3", pages_count = 'pages_count3'),
+]
+
+
+# Оновлення книжки за id
+@app.put("/books/{id}")
+async def update_book(id: int, book: Book):
+    for i in range(len(books)):
+        if books[i].id == id:
+            books[i] = book
+            return {"message": "Book updated"}
+    raise HTTPException(status_code=404, detail="Book not found")
+
+
+# Видалення книжки за id
+@app.delete("/books/{id}")
+async def delete_book(id: int):
+    for i in range(len(books)):
+        if books[i].id == id:
+            del books[i]
+            return {"message": "Book deleted"}
+    raise HTTPException(status_code=404, detail="Book not found")
+
+
+# Пошук книжки за id
+@app.get("/books/{id}")
+async def get_book(id: int):
+    for book in books:
+        if book.id == id:
+            return book
+    raise HTTPException(status_code=404, detail="Book not found")
\ No newline at end of file