User pushed back: the timestamp bug should have been caught by E2E.
Right — my earlier coverage tested the server contract (notify endpoint,
WS broadcast filter) but never the chat-history HYDRATION path. Without
a unit test that froze the wall clock and asserted timestamps came from
created_at, a future refactor could re-introduce the same bug.
This commit:
1. Extracts the per-row → ChatMessage[] mapping out of the closure
inside loadMessagesFromDB into chat/historyHydration.ts. Pure
function, no React dependency, easy to test.
2. Adds 12 vitest cases in __tests__/historyHydration.test.ts covering:
- Timestamp regression (3 tests, with system time frozen to 2030 so
a regression starts producing "2030-…" timestamps and the assertion
fails unmistakably). The third test mirrors the user's screenshot:
two rows with distinct created_at must produce distinct timestamps.
- User-message extraction (text, internal-self filter, null body)
- Agent-message extraction (text, error→system role, file attachments,
null body, body with neither text nor files)
- End-to-end: a single row with both request and response emits
two messages with the same timestamp (the canonical canvas-source
row pattern)
3. The new file-attachment test caught a SECOND latent bug — the helper
was passing `response_body.result ?? response_body` to extractFiles
FromTask, which passes the STRING "<text>" for the notify-with-
attachments shape `{result: "<text>", parts: [...]}` and silently
returns []. So a chat reload after an agent attached a file would
lose the chips. Fixed by only unwrapping `result` when it's an
object (the task-shape) and falling through to response_body
otherwise (the notify shape).
ChatTab now imports the helper and the loop body becomes one line:
`messages.push(...activityRowToMessages(a, isInternalSelfMessage))`.
Verification:
- 12/12 historyHydration tests pass
- 1072/1072 full canvas vitest pass (was 1060 before, +12)
- tsc --noEmit clean
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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