Refactored to avoid duplicate queries:
- One SQL query gets users with flags for which notification types they want
- One task query gets all active tasks for those users
- Single loop processes tasks, using map lookup for user preferences
Previously called processSmartRemindersForType twice (due_soon, overdue),
each doing separate user query + task query. Users with both types at
same hour had their tasks queried twice.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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