diff --git a/src/database/book.py b/src/database/book.py
index a34c8a8..19cc76b 100644
--- a/src/database/book.py
+++ b/src/database/book.py
@@ -29,9 +29,8 @@ def create_new_book(book: Book):
 
 
 def update_book(book: Book):
-    session = DatabaseManager.get_session()
     try:
-        with session:
+        with DatabaseManager.get_session() as session:
             logger.debug(f"Updating book {book.title}")
             existing_book = session.query(Book).get(book.id)
 
@@ -57,10 +56,10 @@ def update_book(book: Book):
         raise DatabaseConnectionError(
             "Connection with database interrupted") from e
     except SQLAlchemyError as e:
-        logger.error(f"An error occured when saving book: {e}")
+        logger.error(f"An error occurred when saving book: {e}")
         session.rollback()
         raise DatabaseError(
-            "An error occured when updating the book") from e
+            "An error occurred when updating the book") from e
 
 
 __all__ = ["create_new_book", "update_book"]
diff --git a/src/importer/book/book_importer.py b/src/importer/book/book_importer.py
index 9e93ef8..1e8ff15 100644
--- a/src/importer/book/book_importer.py
+++ b/src/importer/book/book_importer.py
@@ -1,14 +1,19 @@
-from typing import List, Dict
 import os
 import logging
+import time
+
+from typing import List, Dict
+
 from xml.etree import ElementTree as ET
 from xmlschema import XMLSchema
+from sqlalchemy.exc import IntegrityError
+
 from database.manager import DatabaseManager
 from utils.errors.import_error.xsd_scheme_not_found import XsdSchemeNotFoundError
 from utils.errors.import_error.invalid_contents_error import InvalidContentsError
 from utils.errors.import_error.import_error import ImportError
+from utils.config import UserConfig
 from models import Book, Author, BookCategory
-from sqlalchemy.exc import IntegrityError
 
 class BookImporter:
     def __init__(self):
@@ -124,6 +129,12 @@ class BookImporter:
                         categories=filtered_categories
                     )
                     session.add(book)
+                user_config = UserConfig()
+
+                if user_config.simulate_slowdown:
+                    self.logger.info("Simulating slowdown for 10 seconds")
+                    time.sleep(10)
+
                 # Commit all changes
                 session.commit()
         except e:
diff --git a/src/models/__init__.py b/src/models/__init__.py
index 75a6878..70d192d 100644
--- a/src/models/__init__.py
+++ b/src/models/__init__.py
@@ -2,6 +2,7 @@ from .author import *
 from .book import *
 from .book_category import *
 from .book_category_link import *
+from .book_category_statistics import *
 from .book_overview import *
 from .member import *
 from .librarian import *
@@ -12,6 +13,7 @@ __all__ = [
     *book.__all__,
     *book_category.__all__,
     *book_category_link.__all__,
+    *book_category_statistics.__all__,
     *book_overview.__all__,
     *member.__all__,
     *librarian.__all__,
diff --git a/src/models/book.py b/src/models/book.py
index caf6c5a..2a885cd 100644
--- a/src/models/book.py
+++ b/src/models/book.py
@@ -26,8 +26,9 @@ class Book(Base):
     created_at     = Column(TIMESTAMP, nullable=False, server_default=func.now())
     last_updated   = Column(TIMESTAMP, nullable=False, server_default=func.now())
 
-    author     = relationship('Author', back_populates='books')
-    categories = relationship('BookCategory',secondary='book_category_link',back_populates='books')
+    author                   = relationship('Author', back_populates='books')
+    categories               = relationship('BookCategory',secondary='book_category_link',back_populates='books')
+    book_category_statistics = relationship('BookCategoryStatistics', back_populates='book_category_statistics')
 
 
 __all__ = ["Book", "BookStatusEnum"]
diff --git a/src/models/book_category_statistics.py b/src/models/book_category_statistics.py
new file mode 100644
index 0000000..4a9888e
--- /dev/null
+++ b/src/models/book_category_statistics.py
@@ -0,0 +1,18 @@
+from sqlalchemy import Column, Integer, ForeignKey
+from sqlalchemy.orm import relationship
+
+from .base import Base
+
+class BookCategoryStatistics(Base):
+    __tablename__ = 'book_category_statistics'
+
+    book_category_id = Column(Integer, ForeignKey('book_category.id', ondelete="cascade"), primary_key=True)
+    count = Column(Integer(unsigned=True), nullable=False, default=0)
+
+    category = relationship(
+        'BookCategory',
+        back_populates='book_category_statistics'
+    )
+
+
+__all__ = ["BookCategoryStatistics"]