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Replaces the unused EMAIL_WEBHOOK_URL stub with a real Microsoft Graph Mail.Send pipeline via @azure/msal-node client-credentials flow. Prior state on prod: every alert email was logged to journalctl and never sent (21 fallback log lines per hour for the chronic-offline devices). Four coordinated changes shipped as one commit since they're all part of making email delivery actually work responsibly: 1. services/email.js (NEW): Graph send via plain HTTPS (no SDK), in-memory MSAL token cache (refresh 60s pre-expiry), graceful stdout fallback when GRAPH_* env vars absent. Drop-in replacement for the old webhook. 2. services/alerts.js refactored: sequential await around sendEmail (was parallel fire-and-forget; first run hit Graph's MailboxConcurrency 429 ApplicationThrottled on a 30-device backlog). Sequential at ~250ms per send takes 5-8s for the full backlog, well within the 60s tick. Also: 24h long-offline cutoff to stop nagging about chronic-offline devices (the 20,000+ minute ones); 2-hour dedup window (was 1h) via a generic shouldSendAlert(type, id, windowMs) helper that future alert types (payment_failed, plan_limit_hit, etc.) can reuse. 3. Preferences UI: single checkbox in settings.js Account section bound to users.email_alerts. Saved via the existing Save Profile button. PUT /api/auth/me extended to accept email_alerts. requireAuth middleware SELECT now includes email_alerts so it propagates via req.user. 4. Dev safety net: GRAPH_DEV_RESTRICT_TO env var as an allow-list. When set, only listed recipients reach Graph; everyone else is suppressed with a log line. Prevents local dev (which often runs against fresh prod DB copies) from accidentally emailing real prod users. UNSET on prod systemd unit so production fans out normally. Also: package.json scripts use --env-file-if-exists=.env so local dev picks up .env automatically (Node 20.6+ built-in, no dotenv dep). Prod runs via systemd ExecStart and is unaffected. server/.gitignore added to keep .env out of git. Smoke verified end-to-end: - Sequential send pattern verified (a prior parallel-send tick had hit Graph's MailboxConcurrency 429 on 30 simultaneous sends; sequential at ~250ms each completes the same backlog without throttling) - 24h cutoff silenced 20/21 prod devices on the next tick - Dev restrict suppressed the 1 within-24h send - User-preference toggle flipped via UI -> DB -> alert path silently continued before reaching even the suppression log |
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