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9406bfbc0a
Fixes #29632. The issue description explains this well: We currently recalculate `currently_used_upload_space_bytes` every file upload, by dint of calling `flush_used_upload_space_cache` on save/delete, and then immediately calling `user_profile.realm.currently_used_upload_space_bytes()` in `notify_attachment_update`. Since this walks the Attachments table, recalculating this can take seconds in large realms. Switch this to using a CountStat, so we don't need to walk significant chunks of the Attachment table when we upload an attachment. This will also give us a historical daily graph of usage.