Update app.py

app.py

@@ -53,16 +53,14 @@ Respond in a manner that reflects your expertise and wisdom.
 history_df = pd.DataFrame(columns=['Timestamp', 'Request', 'Response'])
 
 def save_history():
-    history_json = history_df.to_json(orient='records', date_format='iso')
-    with open('chat_history.json', 'w') as f:
-        json.dump(json.loads(history_json), f)
+    history_df_copy = history_df.copy()
+    history_df_copy['Timestamp'] = history_df_copy['Timestamp'].astype(str)
+    history_df_copy.to_json('chat_history.json', orient='records')
 
 def load_history():
     global history_df
     if os.path.exists('chat_history.json'):
-        with open('chat_history.json', 'r') as f:
-            history_data = json.load(f)
-        history_df = pd.DataFrame(history_data)
+        history_df = pd.read_json('chat_history.json', orient='records')
         history_df['Timestamp'] = pd.to_datetime(history_df['Timestamp'])
     else:
         history_df = pd.DataFrame(columns=['Timestamp', 'Request', 'Response'])
@@ -109,11 +107,15 @@ async def respond(audio, model, seed):
     return tmp_path
 
 def display_history():
-    return load_history()
+    df = load_history()
+    df['Timestamp'] = df['Timestamp'].astype(str)
+    return df
 
 def download_history():
     csv_buffer = io.StringIO()
-    history_df.to_csv(csv_buffer, index=False)
+    history_df_copy = history_df.copy()
+    history_df_copy['Timestamp'] = history_df_copy['Timestamp'].astype(str)
+    history_df_copy.to_csv(csv_buffer, index=False)
     csv_string = csv_buffer.getvalue()
     b64 = base64.b64encode(csv_string.encode()).decode()
     href = f'data:text/csv;base64,{b64}'