I have a small app displaying an AG-Grid table from an existing dataframe (the dataframe is originally a csv file read at the at the beginning of the app):

live_data = pd.read_csv('live_data.csv', index_col = 0)

app = Dash(__name__)

eurex_app.layout = html.Div([
    dcc.Tabs([
        
        dcc.Tab(label='Live', style=tab_style, selected_style=tab_selected_style, children=[
             html.Br(),
             dag.AgGrid(
                 id="live_table",
                 className="ag-theme-balham",
                 defaultColDef={"filter": True, "autoHeaderHeight": True, "floatingFilter": True},
                 columnSize="sizeToFit",
                 style={"height": 800, "width": '100%'},
                 rowData=eurex_live_datatable.to_dict("records"),
                 columnDefs=live_columns,
                 getRowStyle = getRowStyle,
                 dashGridOptions={"pagination": True, 'tooltipMouseTrack': True}),
            dbc.Button("Refresh", id = 'refresh_button', n_clicks=0, style={'width' :'10%', 'fontWeight': 'bold', "margin-left": "850px", 'backgroundColor': '#F9F6EE', 'font-family':'Calibri', 'margin-top': '12px', 'border-color':'blue'})
        ]),
   ])
])

I added a button trying to use it to update the ag-grid table by reading the new csv:

@app.callback(Output('live_table', 'data'),
                    Input('refresh_button', 'n_clicks'),
                    prevent_initial_call = True)

def update_live(n_clicks): 

    if not n_clicks: 
        raise PreventUpdate
    
    df = pd.read_csv('live_data.csv', index_col = 0)
    live_data = format_live(df)
    
    return live_data.to_dict("records")

It seems I am missing something…is there anything related to external downloads from the app…
I saw some explanations about some @app.server connection to allow downloading CSV file in dash apps but can’t get my head on it. If anyone had this use case by the past…

Thanks