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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/dbmock/dbmock.go
+15
View File
@@ -7790,6 +7790,21 @@ func (mr *MockStoreMockRecorder) UpdateChatLabelsByID(ctx, arg any) *gomock.Call
return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UpdateChatLabelsByID", reflect.TypeOf((*MockStore)(nil).UpdateChatLabelsByID), ctx, arg)
}
// UpdateChatLastInjectedContext mocks base method.
func (m *MockStore) UpdateChatLastInjectedContext(ctx context.Context, arg database.UpdateChatLastInjectedContextParams) (database.Chat, error) {
m.ctrl.T.Helper()
ret := m.ctrl.Call(m, "UpdateChatLastInjectedContext", ctx, arg)
ret0, _ := ret[0].(database.Chat)
ret1, _ := ret[1].(error)
return ret0, ret1
}
// UpdateChatLastInjectedContext indicates an expected call of UpdateChatLastInjectedContext.
func (mr *MockStoreMockRecorder) UpdateChatLastInjectedContext(ctx, arg any) *gomock.Call {
mr.mock.ctrl.T.Helper()
return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UpdateChatLastInjectedContext", reflect.TypeOf((*MockStore)(nil).UpdateChatLastInjectedContext), ctx, arg)
}
// UpdateChatLastModelConfigByID mocks base method.
func (m *MockStore) UpdateChatLastModelConfigByID(ctx context.Context, arg database.UpdateChatLastModelConfigByIDParams) (database.Chat, error) {
m.ctrl.T.Helper()