How to restart Flask application by refreshing page

I have a simple Flask application that queries a database using a set of parameters and then plots the result. This works fine, but how do I restart application whenever its still ruing and I do a refresh of the page or I click the submit button again?

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def index():
   form = InputForm(request.form)
   if request.method == 'POST' and form.validate():
       data = queryDatabase(form.startdate.data, form.enddate.data)
       result = plotData(data)
   else:
       result = None
   retu render_template('view.html', form=form, result=result)

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000, debug=True)


 ----view.html
<form method=post action="">
<table>
  {% for field in form %}
    <tr>
    <td>{{ field.label }}</td>
        <td>{{ field }}</td>

    </tr>
  {% endfor %}
</table>
<p><input type=submit value=Submit></form></p>

<p>
{% if result != None %}
<img src="{{ result }}" width="500">
{% endif %}
</p>