Service persistent_notification mark_read versus dismiss: what does it do?

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trying to figure out what the only new discovered service persistent_notification.mark_read does, I cant seem to find any hints to that in the docs…

Was this recently added, or have I always missed this. I have a rather extensive system of automations using persistent_notifications and automatic dismissal, so am rather interested to see if this could add something useful to the toolbox.
When should we use ‘mark_read’ , what does it do other than the obvious, and how can we see that happening in the frontend.

Second question I have been wanting to ask for some time, is whether we can see the notification_id of the persistent_notifications in the state machine? it’s not an attribute, nor a state attribute, and nowhere to be found. Yet these id’s are automatically created by the system, or manual by setting an id in an automation eg.

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Without testing I would guess the dismiss gets rid of the notification but mark_read leaves it in your notification tray, but reduces the unread messages count in the bubble on the sidebar by one.

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yes that could very well be. But how use it then? If one doesn’t know the id, there’s no way to mark_read any notification, without a button in the left_side overview?

Isn’t it a bit odd, this is so ‘undocumented’?