fix KeyError: 7 becasue of state object being re-intialised within process_pdf()

app.py

@@ -59,10 +59,15 @@ def process_pdf(pdf_file, state):
                 state
             )
 
+        # Remove the old temporary directory if it exists
+        if os.path.exists(state.vector_store_path):
+            shutil.rmtree(state.vector_store_path)
+            state.db = None  # Reset the database state
+
         # Create a new session and directory for the user
-        state = new_session()
-        if not os.path.exists(state.vector_store_path):
-            os.makedirs(state.vector_store_path)
+        state.session_id = str(uuid.uuid4())
+        state.vector_store_path = os.path.join(CHROMA_DB_PATH, state.session_id)
+        os.makedirs(state.vector_store_path)
 
         # Extract text from the PDF using PyMuPDF (fitz)
         doc = fitz.open(pdf_file.name)