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feat: add last_injected_context column to chats table (#23798)

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Adds a nullable JSONB column `last_injected_context` to the `chats`
table that stores the most recently persisted injected context parts
(AGENTS.md context-file and skill message parts). The column is updated
only when `persistInstructionFiles()` runs — on first workspace attach
or when the agent changes — so there are no redundant writes on
subsequent turns.

Internal fields (`ContextFileContent`, `ContextFileOS`,
`ContextFileDirectory`, `SkillDir`) are stripped at write time so the
column only holds small metadata. No stripping needed on the read path.

<details>
<summary>Implementation notes</summary>

- New migration `000456` adds nullable `last_injected_context JSONB`
column.
- New SQL query `UpdateChatLastInjectedContext` writes the column
without touching `updated_at`.
- `persistInstructionFiles()` strips internal fields from parts via
`StripInternal()` before persisting.
- Sentinel path (no AGENTS.md) persists skill-only parts when skills
exist.
- `codersdk.Chat` exposes `LastInjectedContext []ChatMessagePart`
(omitempty).
- `db2sdk.Chat()` passes through the already-clean data.

</details>
This commit is contained in:
Kyle Carberry
2026-03-30 14:11:30 -04:00
committed by GitHub
parent ef3aade647
commit a5cc579453
18 changed files with 521 additions and 39 deletions
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coderd/database/querier.go
+5
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@@ -854,6 +854,11 @@ type sqlcQuerier interface {
// replicas know the worker is still alive.
UpdateChatHeartbeat(ctx context.Context, arg UpdateChatHeartbeatParams) (int64, error)
UpdateChatLabelsByID(ctx context.Context, arg UpdateChatLabelsByIDParams) (Chat, error)
// Updates the cached injected context parts (AGENTS.md +
// skills) on the chat row. Called only when context changes
// (first workspace attach or agent change). updated_at is
// intentionally not touched to avoid reordering the chat list.
UpdateChatLastInjectedContext(ctx context.Context, arg UpdateChatLastInjectedContextParams) (Chat, error)
UpdateChatLastModelConfigByID(ctx context.Context, arg UpdateChatLastModelConfigByIDParams) (Chat, error)
// Updates the last read message ID for a chat. This is used to track
// which messages the owner has seen, enabling unread indicators.