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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/dbmetrics/querymetrics.go
+8
View File
@@ -4112,6 +4112,14 @@ func (m queryMetricsStore) UpdateChatLabelsByID(ctx context.Context, arg databas
return r0, r1
}
func (m queryMetricsStore) UpdateChatLastInjectedContext(ctx context.Context, arg database.UpdateChatLastInjectedContextParams) (database.Chat, error) {
start := time.Now()
r0, r1 := m.s.UpdateChatLastInjectedContext(ctx, arg)
m.queryLatencies.WithLabelValues("UpdateChatLastInjectedContext").Observe(time.Since(start).Seconds())
m.queryCounts.WithLabelValues(httpmw.ExtractHTTPRoute(ctx), httpmw.ExtractHTTPMethod(ctx), "UpdateChatLastInjectedContext").Inc()
return r0, r1
}
func (m queryMetricsStore) UpdateChatLastModelConfigByID(ctx context.Context, arg database.UpdateChatLastModelConfigByIDParams) (database.Chat, error) {
start := time.Now()
r0, r1 := m.s.UpdateChatLastModelConfigByID(ctx, arg)