I have installed Extension:Echo. Notifying it's ok, but I don't know, what can be set it to allow removing readed messages. User can only do switch between 'read' or 'unread' state.
Topic on Extension talk:Echo
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There is currently no way for someone to explicitly delete notifications. Older read notifications are purged periodically from the database for performance reasons.
Best solution for my wiki was finally change of code in includes/gateway/UserNotificationGateway.php
, where I remove item in 'notification_table' instead of writing the timestamp into 'notification_read_timestamp'. Orphaned item remain in the 'event_table', but isn't problem, because may be later cleaned by maintenance script maintenance/removeOrphanedEvents.php
I know that. But here, when I mark a message as read, is probably changed value 'event_deleted' from 0 to 1 in the table Extension:Echo/echo_event table. Because it has this effect for view of the Alerts. In the code is a function „toggleDeleted” that should allow this, but it's not clear to me how and when it is called.