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Michael Suchacz
c7cac9debe
Previously, `chats.last_model_config_id` was not updated when a user sent a mid-chat message with a different model, and queued messages did not store their own per-turn model, so promotion ran against whatever the chat row said at promote time. Chat watch events also did not merge `last_model_config_id` into the site's root, child, and per-chat caches, so sidebar labels stayed stale after direct sends and queued promotions. - Add nullable `chat_queued_messages.model_config_id`, backfilled from `chats.last_model_config_id`. Queued inserts round-trip the effective model id at enqueue time. - In `coderd/x/chatd`, direct sends update `chats.last_model_config_id` inside the same transaction that inserts the admitted user message. Manual promotion and auto-promotion use the queued row's stored `model_config_id`, with a fallback to `chats.last_model_config_id` for legacy NULL rows during rollout. `PromoteQueuedOptions.ModelConfigID` is now ignored. - On the site, extract `mergeWatchedChatSummary` and `mergeWatchedChatIntoCaches` in `site/src/api/queries/chats.ts` so status-change watch events merge `last_model_config_id` into the root infinite chat list, the parent-embedded child entry, and the per-chat `chatKey(chatId)` cache. `updated_at` guards against stale watch payloads clobbering newer cached state, while diff status events still merge their PR metadata because they are timestamped outside the chat row. Watch timestamps are compared as instants so variable fractional precision does not make fresh events look stale. - Queued promotion validates stored model config IDs before admission. Invalid legacy queued IDs fall back to the chat's current model config instead of dropping the queued message during auto-promotion. - Backend and frontend regression coverage added for admission, queue promotion (including FIFO across mixed models, legacy NULL fallback, and invalid queued model IDs), and chat watch cache merging. > Mux is acting on Mike's behalf.