Adds the `head_branch` field (the source/feature branch name of a PR) to
the diff status pipeline. Previously only `base_branch` (target branch)
and the head commit SHA were captured from the GitHub API, but not the
head branch name itself.
## Changes
- **Migration 438**: Add `head_branch` nullable TEXT column to
`chat_diff_statuses`
- **gitprovider**: Parse `head.ref` from the GitHub API response
(alongside `head.sha`) and add `HeadBranch` to `PRStatus`
- **gitsync**: Wire `HeadBranch` through `refreshOne()` into the DB
upsert params
- **worker**: Map `HeadBranch` in `chatDiffStatusFromRow()`
- **coderd**: Convert `HeadBranch` in `convertChatDiffStatus()`
- **codersdk**: Expose as `head_branch` (`*string`, omitempty) in
`ChatDiffStatus` API response
- **Tests**: Updated `github_test.go` pull JSON fixtures and assertions
## Problem
The gitsync worker polls every 10s and refreshes up to 50 stale
`chat_diff_status` rows **sequentially**, sharing a single 10-second
context timeout. With 50 rows × 1–3 HTTP calls each, the timeout is
exhausted quickly, causing cascading `context deadline exceeded` errors.
Rows with no linked OAuth token (`ErrNoTokenAvailable`) fail fast but
recur every 120s, wasting batch capacity.
## Solution
Three targeted fixes:
### 1. Concurrent refresh processing
`Refresher.Refresh()` now launches goroutines bounded by a semaphore
(`defaultConcurrency = 10`). Provider/token resolution remains
sequential (fast DB lookups); only the HTTP calls run in parallel.
Per-group rate-limit detection uses `atomic.Pointer[RateLimitError]`
with best-effort skip of remaining rows — a rate-limit hit on one
provider doesn't stall requests to other providers.
### 2. Decoupled tick timeout
New `defaultTickTimeout = 30s`, separate from `defaultInterval = 10s`.
The `tick()` method uses `tickTimeout` for its context deadline, giving
concurrent HTTP calls enough headroom to complete without stalling the
next polling cycle.
### 3. Longer backoff for no-token errors
New `NoTokenBackoff = 10 * time.Minute` (exported). When `errors.Is(err,
ErrNoTokenAvailable)`, the worker applies a 10-minute backoff instead of
`DiffStatusTTL` (2 minutes). Retrying every 2 minutes is pointless until
the user manually links their external auth account.
## Design decisions
- Both `NewRefresher` and `NewWorker` accept variadic option functions
(`RefresherOption`, `WorkerOption`) for backward compatibility —
existing callers in `coderd/coderd.go` need no changes.
- `WithConcurrency(n)` and `WithTickTimeout(d)` are available for tests
and future tuning.
- Added `resolvedGroup` struct to cleanly separate the pre-resolution
phase from the concurrent execution phase.
## Testing
- **`TestRefresher_RateLimitSkipsRemainingInGroup`** — rewritten to be
goroutine-order-independent (verifies aggregate counts instead of
per-index results).
- **`TestRefresher_ConcurrentProcessing`** — new test using a gate
channel to prove N goroutines enter `FetchPullRequestStatus`
simultaneously.
- **`TestWorker_RefresherError_BacksOffRow`** — rewritten to use
branch-name-based failure determination instead of non-deterministic
`callCount`.
- **`TestWorker_NoTokenBackoff`** — new test verifying
`ErrNoTokenAvailable` triggers 10-minute backoff.
- All tests pass under `-race -count=3`.
Adds `pull_request_title` and `pull_request_draft` to the chat diff
status pipeline (DB → provider → SDK → frontend). The GitHub provider
now fetches the PR title alongside existing status fields.
The agents sidebar now displays PR-state-aware icons for chats that have
a linked pull request (when the chat is in waiting/completed state):
- **Open PR**: `GitPullRequestArrow` (green)
- **Draft PR**: `GitPullRequestDraft` (gray)
- **Merged PR**: `GitMerge` (purple)
- **Closed PR**: `GitPullRequestClosed` (red)
Running/pending/paused/error chats keep their existing activity icons
(spinner, pause, error triangle).
### Changes
**Database migration** (`000432`): Adds `pull_request_title TEXT` and
`pull_request_draft BOOLEAN` columns to `chat_diff_statuses`.
**Backend pipeline**:
- `gitprovider.PRStatus` gains a `Title` field
- GitHub provider decodes the `title` from the API response
- `gitsync` and `coderd/chats.go` pass title + draft through to the DB
upsert
- `codersdk.ChatDiffStatus` exposes both new fields in the API response
**Frontend** (`AgentsSidebar.tsx`): New `getPRIconConfig()` function
resolves the appropriate Lucide git icon based on `pull_request_state`
and `pull_request_draft`. Only applies when the chat is in a terminal
state (waiting/completed).
**Real-time sync**: No changes needed — the existing
`diff_status_change` pubsub event already propagates the full
`ChatDiffStatus` including the new fields.
- Adds `_API_BASE_URL` to `CODER_EXTERNAL_AUTH_CONFIG_`
- Extracts and refactors existing GitHub PR sync logic to new packages
`coderd/gitsync` and `coderd/externalauth/gitprovider`
- Associated wiring and tests
Created using Opus 4.6
Kyle Carberry