## Summary
The dev seeder creates `ConnectedAccount` records with fake OAuth tokens
(`'exampleRefreshToken'` / `'exampleAccessToken'`) and points
`MessageChannel` / `CalendarChannel` records at them with
`isSyncEnabled: true`. When the sync cron jobs run in the demo
workspace, they:
1. Pick up these seeded channels (filter is `isSyncEnabled: true` +
pending sync stage)
2. Try to refresh the fake OAuth tokens
3. Mark the channels as `FAILED_INSUFFICIENT_PERMISSIONS`
4. Surface a "Sync lost with mailbox X — please reconnect" banner in the
UI
This banner appears every time the demo workspace is loaded, even though
nothing is actually broken.
## Fix
Set `isSyncEnabled: false` on all 12 seeded channels (6 message, 6
calendar). This is the canonical "don't sync this channel" mechanism —
the same state a real user lands in when they toggle sync off in account
settings.
## Why this approach
- **ConnectedAccount records stay**: the demo workspace still shows Tim,
Jony, Phil, Jane as having connected their email/calendar — realistic
- **Pre-seeded messages and calendar events stay visible**: those don't
depend on `isSyncEnabled`
- **Crons no longer pick them up**: they filter on `isSyncEnabled:
true`, so `false` short-circuits the entire sync attempt — no failure,
no banner
- **Semantically correct**: the seeded accounts have fake tokens that
were never going to sync successfully; `isSyncEnabled: true` was
effectively a lie
- **No production code touched**: no `isDemo` flags, no magic-string
detection, no workspace-ID filters in the cron path
## Alternatives considered and rejected
- **Add an `isDemo` flag**: schema change, leaks demo knowledge into
production tables
- **Skip channels with fake tokens (`example*` pattern)**: hacky
magic-string detection in the auth refresh path
- **Filter demo workspace IDs in the cron**: production paths shouldn't
reference demo IDs
- **Don't activate demo workspaces**: breaks the demo workspace UX
entirely
## Test plan
- [ ] Reset the database and reseed (`npx nx database:reset
twenty-server`)
- [ ] Load the demo workspace — confirm no "Sync lost with mailbox"
banner appears
- [ ] Confirm seeded connected accounts still show in Settings →
Accounts
- [ ] Confirm pre-seeded messages and calendar events still appear in
the UI
- [ ] Confirm a real connected account (added via OAuth) still syncs
normally — its channel will have `isSyncEnabled: true` and the cron will
pick it up
## Related
Companion to https://github.com/twentyhq/twenty/pull/20167, which
removes the `--dev-mode` cron filter that was masking this banner issue
in the dev image.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
