data_input_widget.py

import pandas as pd
import streamlit as st

def construct_timestamp_index(data: pd.DataFrame) -> pd.DataFrame:
    data.index = pd.to_datetime(data['Timestamp (UTC)'],
                                format='%Y-%m-%d %H:%M:%S')
    return data.drop(columns=['Timestamp (UTC)'])

def upload_csv(hint: str) -> pd.DataFrame:
    uploaded_file = st.sidebar.file_uploader(label=hint)
    if uploaded_file is not None:
        return construct_timestamp_index(pd.read_csv(uploaded_file))
    return pd.DataFrame()