This update improves the performance of the messaging system by preventing duplicate notification broadcasts across multiple modules. The change ensures that after system resets, notification tracking starts fresh, reducing unnecessary processing and improving overall system responsiveness for users relying on real-time messaging features like chat and helpdesk support.

* = documents_spreadsheet, website_helpdesk_livechat, whatsapp

Enterprise counter-part.

After a reset, the last id is always 0.

backport of https://github.com/odoo/enterprise/pull/68302

community: https://github.com/odoo/odoo/pull/177705