The daily email digest

After each daily market update (right after tcgcsv publishes at ~20:00 UTC), the app can email you products whose market price moved beyond a threshold (default 5%) or fell below your break-even — the "selling at market now loses money" warning. Configure SMTP details under Settings (for Gmail: smtp.gmail.com, port 587, an app password) and use "Send test email" to verify. It only sends when there's something to say, and only while the app is running at update time.