## Summary
Gives the AI chat agent temporal awareness by injecting the current date
into
the system prompt and a per-message "sent at" timestamp into each user
message,
formatted in the member's timezone. Also hardens all timezone formatting
against
the `"system"` sentinel value, which was crashing the stream job.
## What changed
**Message timestamps (new)**
- Added `injectMessageTimestamps` util: prepends a
`<message_timestamp>Sent: …</message_timestamp>`
text part to each user message before it's sent to the model, so the
agent can
reason about "yesterday", "last week", etc.
- `loadMessagesFromDB` now stores the message time in the canonical
`metadata.createdAt` slot (ISO string, JSON-serializable for the BullMQ
job
payload) instead of a non-typed top-level `createdAt` field that nothing
read.
- Migrated the AI chat message pipeline from the generic `UIMessage` to
the
typed `ExtendedUIMessage` (`chat-execution.service`,
`extract-code-interpreter-files`,
`replace-unsupported-file-parts`, and related types), since
`metadata.createdAt`
is declared on `ExtendedUIMessage`.
**Current date in context**
- System prompt now includes `Current date: …` formatted in the member's
timezone
(`system-prompt-builder.service`).
- Settings › AI prompt preview mirrors the same `Current date` line.
**Timezone safety (bug fix)**
- Workspace members default `timeZone` to the `"system"` sentinel, which
is only
resolvable client-side. Passing it (or any invalid IANA zone) to
`Intl.DateTimeFormat` throws `RangeError: Invalid time zone specified:
system`,
which was failing the stream job.
- Added `getValidTimeZoneOrUndefined`, which returns a valid IANA zone
or
`undefined` (letting the runtime fall back to its default). Used in both
`injectMessageTimestamps` and `formatCurrentDate`. This mirrors the
existing
`isValidTimeZone` convention in the calendar module.
## Notes / follow-ups
- For members who never changed `timeZone` from `"system"`, timestamps
fall back
to the server's default zone (UTC). To honor their real local time, the
frontend would need to send the browser-detected zone with the chat
request
(the same way calendar/charts already pass a resolved zone). Not
included here.
## Test plan
- [x] `inject-message-timestamps.util.spec.ts` — covers timestamp
injection,
assistant messages untouched, invalid `createdAt`, and the `"system"`
timezone no longer throwing.
- [ ] Send a chat message and confirm the agent sees the correct
date/time.
- [ ] Verify a member with `timeZone = "system"` no longer crashes the
stream job.
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Etienne
cc7b41db0e
