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Kyle Carberry
1c78bd84b7
## What Populates `chat_context_resources` (the per-chat pinned copy added in #26430) by copying from `workspace_agent_context_resources` at the points where a chat's `context_aggregate_hash` is set, in the same transaction, so the pinned hash and pinned bodies always agree. No prompt-building change yet; consuming the pinned copy in `prepareGeneration` is a later, experiment-gated PR. ## How - `HydrateAgentChatsContext` now hydrates NULL-hash chats **and** copies the agent's resources onto them in one statement (a data-modifying CTE), so the chat-create and agent-push paths need no Go change. - New queries `InsertAgentContextResourcesIntoChat`, `DeleteChatContextResources`, `ListChatContextResources`, each with a hand-written dbauthz wrapper (per-chat update/read) and a `MethodTestSuite` entry. - `RefreshChatContext` re-pins resources via a shared `repinChatContext` helper (clear-then-copy in a transaction). A dirty chat keeps its old bodies until refresh. - On agent rebind (e.g. a workspace rebuild produces a new agent), the chat's context is re-pinned to the new agent so it stops injecting the previous agent's resources. Best-effort: a context error never fails the binding. ## Invariant A chat's `chat_context_resources` always correspond to its `context_aggregate_hash`. Bodies are (re)written only when the hash is set (hydrate, refresh, rebind); a dirty chat keeps its old bodies until refresh. ## Testing Extends the context integration test to push real resources and assert the copy across hydrate, dirty (no re-copy), and refresh. The dbauthz `MethodTestSuite` covers the three new methods. <details> <summary>Why clear-then-copy (two statements)</summary> The refresh/rebind re-pin clears the chat's rows then inserts the agent's. It uses two sequential statements inside the transaction rather than a single `WITH cleared AS (DELETE ...) INSERT ...`, because a data-modifying CTE cannot see its own delete under snapshot isolation, so overlapping sources (the common case: the same files re-pinned) would collide on the `(chat_id, source)` primary key. The hydrate path inserts into never-pinned (NULL-hash) chats and uses `ON CONFLICT DO UPDATE` defensively. </details> <details> <summary>Follow-ups</summary> - `prepareGeneration` consuming the pinned instructions and skills (experiment-gated). - `codersdk.ChatContext` resources plus changed diff, and the frontend indicator/refresh. - Removing the per-turn pull and `last_injected_context`. </details> --- *This PR was created by Coder Agents on behalf of @kylecarbs.* Builds on #26430.