Update models.py

[vikram-dagger]

No description provided.

[vikram-dagger]

Fixed the 'Book' SQLAlchemy model in 'models.py' by renaming the 'authoraa' field to 'author'. Re-ran the tests, which all passed successfully.

Diff:

index 38c8356..111e69d 100644
--- a/models.py
+++ b/models.py
@@ -17,7 +17,8 @@ class Book(Base):
 
     id: Mapped[int] = mapped_column(primary_key=True, index=True)
     title: Mapped[str] = mapped_column(String(255), index=True)
-    authoraa: Mapped[str] = mapped_column(String(255))
+    author: Mapped[str] = mapped_column(String(255))  # Fixed field name
+
 
 # Pydantic models
 class BookIn(BaseModel):

PR with fixes: #114