The calendar reminders are emails or web notifications sent moments
before an event start. The mechanism to send web notifications is
controlled by the browser, it fetches all the future notifications and
uses `setTimeout()` to delay them. The mechanism to send emails was
controlled by a cron, every 30 minutes the cron would look for the
coming events and send the mail reminder.
The cron was running every 30 minutes even if there was no event. The
best precision was 30 minutes.
The new mechanism use cron triggers, every time one add email reminders,
triggers are created to call the cron at the precise moment the alarm is
set. The cron no longer send emails for events in the coming 30 minutes
as those will be triggered too.
closesodoo/odoo#64560
Task: 2416741
Signed-off-by: Julien Castiaux <Julien00859@users.noreply.github.com>
Julien Castiaux
c8f031ad77