Function handle_events 

pub async fn handle_events<F, R>(
    db: Database,
    tracker: DynEventLogTracker,
    log_event_added: Receiver<()>,
    call_fn: F,
) -> Result<()>
where
    F: Fn(&mut DatabaseTransaction<'_, NonCommittable>, EventLogEntry) -> R,
    R: Future<Output = Result<()>>,