thanks but i dont want to set activity.actually i need to send web notification to salesperson and when i use notify_danger in res.users model,i get the error :

ValueError: <class 'TypeError'>: "'res.users' object is not callable" while evaluating
'model.send_notification_to_salesperson()'

can you show the code, you have added

py code:
def send_notification_to_salesperson(self):
current_date = datetime.now()
two_weeks_ago = current_date - timedelta(days=14)

forbidden_stages = self.env['crm.stage'].search(['|', ('is_won', '=', True), ('name', '=', 'Lost')]).mapped(
'id')
leads = self.env['crm.lead'].search(
[('stage_id', 'not in', forbidden_stages), ('write_date', '<', two_weeks_ago)])

for lead in leads:
lead.user_id.notify_danger("follow up")

cron code:

<record id="cron_send_notification" model="ir.cron">
<field name="name">Notification: Send Notification</field>
<field name="active" eval="True"/>
<field name="priority">4</field>
<field name="interval_type">days</field>
<field name="interval_number">1</field>
<field name="numbercall">-1</field>
<field name="nextcall" eval="(DateTime.now() + timedelta(days=0)).strftime('%Y-%m-%d 10:03:00')"/>
<field name="model_id" ref="model_crm_lead"/>
<field name="state">code</field>
<field name="code">model.send_notification_to_salesperson()</field>
</record>