Hey Leo โ we're tracking a few things that have been useful: email verification rate (what % of enriched contacts had valid emails), signal coverage (what % of rows had a usable trigger like headcount growth or funding), and downstream reply rate once the emails hit an outreach tool. The last one is the real proof of quality โ if your signal and personalisation are good, replies go up. For continuous improvement, we iterate on the AI prompt whenever reply rate drops below a threshold, and we audit the trigger signal quarterly to check if it's still the strongest one available.