Alerts - checking everyday at specific time

Hi everyone. I’m new in Grafana. I have problem with alerts. I can’t configure alert tab properly. Data in my database are inserted everyday on 6-23. Now I want set the alert, which check everyday after 23, for example 23:30 if amounts of data is above set limit and if so, then alerts me on email. I want alert only if something go wrong, not raport everyday.

I attach my actual config. I tried changing options ‘evaluate every’, ‘For’, and ‘query (B, 24h, now)’ but on different configs it’s not working like I expect. I guess i don’t understand logic of alerting.