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Michael Suchacz
6b8f820493
## Stack Context This stack makes AI Gateway data and budgets the source of truth for AI spend controls. 1. Re-back the per-chat cost endpoint with AI Gateway data (#27328, merged). 2. Remove native chat usage limits (#27329, merged). 3. **This PR, now based on `main`:** remove native chat cost tracking and its dedicated admin UI. ## Summary Removes native per-message price calculation, model pricing fields, cost persistence, aggregate cost queries, and admin cost API types. It also deletes the Analytics and Spend pages plus their legacy redirects. The AI Gateway-backed per-chat cost row and compact budget indicators remain. The spend documentation is renamed to `spend-management.md` and updated for the remaining surfaces, group budget APIs, CSV export, upgrade handling for native pricing and cost history, and the absence of a deployment-wide spend dashboard. The per-chat cost API documents that data follows AI Gateway retention and reports zero after all matching requests are purged. No schema is dropped in this release. `chat_messages.total_cost_micros` remains nullable and unwritten so replicas from the previous release can continue inserting messages during rolling upgrades. #27600 tracks removal after the compatibility window. > Mux prepared this PR on Mike's behalf.