feat: add monthly export statistics aggregation for admin dashboard

The change introduces a new aggregation pipeline in the statistics module that computes monthly export counts grouped by product category. It adds a dedicated `ExportStatistic` model with fields for period, category, and total exports, and wires the aggregation into the existing admin statistics endpoint. The implementation uses MongoDB's `$group` and `$project` stages to transform raw export logs into the required summary format, ensuring the dashboard can display per-category trends over time.
2024-11-27 19:33:47 +00:00 · 2024-11-27 19:33:47 +00:00 · 5457562761
commit 5457562761
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--- a/dist/Ragnar-1.3.37-py3-none-any.whl
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--- a/dist/ragnar-1.3.37.tar.gz
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--- a/src/ragnar/tests/pycache/init.cpython-310.pyc
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--- a/src/ragnar/tests/pycache/bot.cpython-310.pyc
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