Update src/streamlit_app.py

src/streamlit_app.py

@@ -279,10 +279,16 @@ if st.button("Ask") and user_query.strip():
             [f"(📄 Page {r['page']})\n{r['content']}" for r in results]
         )
         answer = generate_answer(context, user_query)
-        st.session_state.history.append({"user": user_query, "assistant": answer})
+        st.session_state.history.append({
+            "user": user_query,
+            "assistant": answer,
+            "timestamp": time.time()
+        })
 
-for chat in st.session_state.history:
-    st_message(chat["user"], is_user=True)
-    st_message(chat["assistant"])
+# ✅ Ensure unique keys to prevent StreamlitDuplicateElementId
+for i, chat in enumerate(st.session_state.history):
+    st_message(chat["user"], is_user=True, key=f"user_{i}")
+    st_message(chat["assistant"], key=f"assistant_{i}")
 
 st.caption("⚡ Powered by FAISS + Open Source Models + Accurate Page Referencing")
+