{"blocks": [{"key": "90406f75", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "bbd2440f", "text": "Design an event system that can handle one million events and send notification emails to each event's participants. Outline architecture, scalability, data storage, email distribution, failure handling, and cost considerations.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}