Setup LSP and clear all lint

lib/books.py

@@ -1,12 +1,11 @@
-import json
-import os
+
 import xml.dom.minidom
 from typing import Dict, List, cast
 
 from PyQt6.QtCore import QCoreApplication
 from PyQt6.QtSql import QSqlQuery
 
-from main import query_error
+from lib import query_error
 
 
 class Book:
@@ -130,7 +129,6 @@ class Book:
             query.bindValue(":content", section)
             if not query.exec():
                 query_error(query)
-            section_id = query.lastInsertId()
         return book_id
 
     def parse_section(self, src: str, href: str) -> None: