mirror of
https://github.com/coder/coder.git
synced 2026-09-21 20:51:01 +08:00
Jaayden HalkoandCursor
3c7a1d33e3
Adds a persisted whole-chat summary that backs the chat summary popover. A new nullable `chats.summary` column is populated in the background after a successful root-chat turn and pushed to clients via a new `chat_summary_change` watch event (distinct from `summary_change`, which is bound to `last_turn_summary`), so the popover reads `chat.summary` straight off the loaded `Chat` with no extra query. This is the data source for the popover and per-chat cost UI built in #26649; the popover can consume `chat.summary` once this lands (the field is nullable, so merge order does not matter). ## How it works - **Generation** runs in the existing successful-turn finalize hook, detached from the request so the user's turn is never blocked. A cadence gate generates the first summary after one completed turn, then regenerates every three turns, using the `chats.summary_generated_at` freshness marker. Generation reads compaction-aware history, renders it to a bounded plain-text transcript (short transcripts are skipped), and asks for a 1-3 sentence summary via structured output. Failures never clear an existing summary. - **Staleness** is guarded by `history_version` (mirroring `last_turn_summary`), so a background write racing a newer turn loses while worker lifecycle transitions cannot reject a fresh write. - **Model selection** uses the chat's configured model. ## Deferred to follow-ups - **Cost accounting**: the `chat_messages.cost_source` discriminator and summary/title usage recording were removed from this PR so summary persistence is not blocked by hidden accounting rows advancing `history_version`. Title usage recording stays on main's `InsertChatMessages` path. - **Model override**: deployment-wide summary generation model selection is split into #26803; the base feature always uses the chat model. ## Notes - Migration `000540` adds `chats.summary` and `chats.summary_generated_at`, and recreates `chats_expanded` to expose the new columns. - Root chats only; shared viewers pick up the summary on their next refetch (live watch events are owner-only). Refs #26649 --------- Co-authored-by: Cursor <cursoragent@cursor.com>