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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/models.go
+23 -22
View File
@@ -4153,28 +4153,29 @@ type BoundaryUsageStat struct {
}
type Chat struct {
ID uuid.UUID `db:"id" json:"id"`
OwnerID uuid.UUID `db:"owner_id" json:"owner_id"`
WorkspaceID uuid.NullUUID `db:"workspace_id" json:"workspace_id"`
Title string `db:"title" json:"title"`
Status ChatStatus `db:"status" json:"status"`
WorkerID uuid.NullUUID `db:"worker_id" json:"worker_id"`
StartedAt sql.NullTime `db:"started_at" json:"started_at"`
HeartbeatAt sql.NullTime `db:"heartbeat_at" json:"heartbeat_at"`
CreatedAt time.Time `db:"created_at" json:"created_at"`
UpdatedAt time.Time `db:"updated_at" json:"updated_at"`
ParentChatID uuid.NullUUID `db:"parent_chat_id" json:"parent_chat_id"`
RootChatID uuid.NullUUID `db:"root_chat_id" json:"root_chat_id"`
LastModelConfigID uuid.UUID `db:"last_model_config_id" json:"last_model_config_id"`
Archived bool `db:"archived" json:"archived"`
LastError sql.NullString `db:"last_error" json:"last_error"`
Mode NullChatMode `db:"mode" json:"mode"`
MCPServerIDs []uuid.UUID `db:"mcp_server_ids" json:"mcp_server_ids"`
Labels StringMap `db:"labels" json:"labels"`
BuildID uuid.NullUUID `db:"build_id" json:"build_id"`
AgentID uuid.NullUUID `db:"agent_id" json:"agent_id"`
PinOrder int32 `db:"pin_order" json:"pin_order"`
LastReadMessageID sql.NullInt64 `db:"last_read_message_id" json:"last_read_message_id"`
ID uuid.UUID `db:"id" json:"id"`
OwnerID uuid.UUID `db:"owner_id" json:"owner_id"`
WorkspaceID uuid.NullUUID `db:"workspace_id" json:"workspace_id"`
Title string `db:"title" json:"title"`
Status ChatStatus `db:"status" json:"status"`
WorkerID uuid.NullUUID `db:"worker_id" json:"worker_id"`
StartedAt sql.NullTime `db:"started_at" json:"started_at"`
HeartbeatAt sql.NullTime `db:"heartbeat_at" json:"heartbeat_at"`
CreatedAt time.Time `db:"created_at" json:"created_at"`
UpdatedAt time.Time `db:"updated_at" json:"updated_at"`
ParentChatID uuid.NullUUID `db:"parent_chat_id" json:"parent_chat_id"`
RootChatID uuid.NullUUID `db:"root_chat_id" json:"root_chat_id"`
LastModelConfigID uuid.UUID `db:"last_model_config_id" json:"last_model_config_id"`
Archived bool `db:"archived" json:"archived"`
LastError sql.NullString `db:"last_error" json:"last_error"`
Mode NullChatMode `db:"mode" json:"mode"`
MCPServerIDs []uuid.UUID `db:"mcp_server_ids" json:"mcp_server_ids"`
Labels StringMap `db:"labels" json:"labels"`
BuildID uuid.NullUUID `db:"build_id" json:"build_id"`
AgentID uuid.NullUUID `db:"agent_id" json:"agent_id"`
PinOrder int32 `db:"pin_order" json:"pin_order"`
LastReadMessageID sql.NullInt64 `db:"last_read_message_id" json:"last_read_message_id"`
LastInjectedContext pqtype.NullRawMessage `db:"last_injected_context" json:"last_injected_context"`
}
type ChatDiffStatus struct {