Signal notifications via Email (SMTP / SendGrid)

[naimkatiman]

Feature: Email Notifications for Signals

Context

TradeClaw currently supports Telegram and Discord push notifications. Email is the most universal notification channel — many users prefer it for daily summaries or don't use Telegram/Discord.

What to implement

Notification types:

1. Instant alert — email sent immediately when a BUY/SELL signal fires
2. Daily digest — summary email of all signals from the last 24h (cron at 8 AM user timezone)

Configuration (in .env):

EMAIL_PROVIDER=smtp        # smtp | sendgrid | resend
SMTP_HOST=smtp.gmail.com
SMTP_PORT=587
SMTP_USER=you@gmail.com
SMTP_PASS=app-password
EMAIL_FROM=alerts@tradeclaw.win
EMAIL_TO=user@example.com  # comma-separated for multiple recipients

Email template:

• Signal type badge (BUY = green, SELL = red, HOLD = grey)
• Symbol, confidence %, timestamp
• Key indicators that fired (RSI: 28, MACD: cross)
• Link to dashboard

Tech

• Use nodemailer for SMTP (already in many Node stacks)
• HTML email template in packages/core/src/notifications/templates/email.html

Acceptance criteria

• SMTP email sends on new BUY/SELL signal
• Daily digest cron sends at configured time
• Email template is readable on mobile
• SendGrid as optional alternative to SMTP
• Documented in README notifications section

Good first issue because

Self-contained notification channel addition, well-defined scope, no changes to signal engine.

[vip0123]

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