[dylanjeffers]

audius.co is over Gmail's 0.3% spam-complaint threshold, and users who have drifted away are the most likely to mark our emails as spam. Product approved stopping these emails for anyone who hasn't opened the app in 90 days.

Change

• getRecentlyActiveUserIds checks discovery users.last_active_at. It's the same app-open ping that the inactivity re-engagement triggers use (findInactiveUsers); web and mobile have sent it since mid-June.
• The daily/weekly digest drops users outside the 90-day window before fetching their notifications, and logs how many it skipped per batch.
• Immediate announcement emails (legacy live users) apply the same check.
• Users with no last_active_at count as inactive.
• Transactional emails (purchases, withdrawals, rewards, welcome) and identity's security emails aren't affected. Push isn't affected.
• getUserEmailFrequency now falls back to weekly instead of daily, matching fix(identity): make weekly the default email frequency apps#14639.
• The createUsers test helper now sets last_active_at so the existing digest DB tests keep their users.

Testing

• New unit tests for getRecentlyActiveUserIds (active subset, cutoff query, empty input).
• tsc --noEmit shows no new errors (the only errors are unresolved @pedalboard/* workspace packages in this worktree).

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