f861479890
This PR reworks our existing billing code in preparation for charging based on LLM usage. We aren't yet exercising the new billing-related code outside of development. There are some noteworthy changes for our existing LLM usage tracking: - A new `monthly_usages` table has been added for tracking usage per-user, per-model, per-month - The per-month usage measures have been removed, in favor of the `monthly_usages` table - All of the per-month metrics in the Clickhouse rows have been changed from a rolling 30-day window to a calendar month Release Notes: - N/A --------- Co-authored-by: Antonio Scandurra <me@as-cii.com> Co-authored-by: Richard <richard@zed.dev> Co-authored-by: Max <max@zed.dev>