bot 69f1503af0 feat: add monthly export statistics aggregation for user activity reports ...

Implement a new aggregation pipeline in the statistics module that groups export events by month and user ID, computing total exports per user per month. The pipeline uses MongoDB's $group stage with date truncation to month granularity, and stores results in a new `monthly_export_stats` collection. This enables generation of per-user activity reports for the admin dashboard.

2024-12-10 19:46:24 +00:00

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