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cal.diy/specs/workflow-translation/decisions.md
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4081d11fbe feat: workflow auto translation (#27087)
* feat: workflow auto translation

* tests: add unit tests

* refactor: tests and workflow

* fix: type err

* fix: type err

* fix: remove redundant index on WorkflowStepTranslation

The @@index on [workflowStepId, field, targetLocale] duplicates the @@unique
constraint on the same columns. A unique index already provides efficient
lookups, so the separate @@index adds storage overhead and write latency
without benefit.

Addresses Cubic AI review feedback (confidence 9/10).

Co-Authored-By: unknown <>

* fix: correct locale mapping when translation API returns null

Map translations with their corresponding locales before filtering to
preserve correct locale-to-translation associations. Previously, filtering
out null translations would reindex the array, causing incorrect locale
mappings when any translation in the batch failed.

Also fixes pre-existing lint warnings:
- Move exports to end of file
- Add explicit return type to processTranslations
- Replace ternary with if-else for upsertMany selection

Co-Authored-By: udit@cal.com <udit222001@gmail.com>

* fix: address review feedback for workflow auto-translation

- Add change detection before creating translation tasks
- Rename userLocale to sourceLocale in task props for clarity
- Show source language in UI with new translation key
- Extract SUPPORTED_LOCALES to shared translationConstants.ts
- Fix locale mapping bug in translateEventTypeData.ts
- Add WhatsApp translation support
- Abstract translation lookup into shared translationLookup.ts helper
- Restore if-else readability for SCANNING_WORKFLOW_STEPS

Co-authored-by: Udit Takkar <udit.takkar@cal.com>
Co-Authored-By: unknown <>

* fix: update test to use sourceLocale instead of userLocale

Co-Authored-By: unknown <>

* refactor: feedback

* fix: handle first time

* fix: tests

* fix: tests

* fix: address Cubic AI review feedback (confidence 9/10 issues)

- WhatsApp translation: Apply variable substitution using getSMSMessageWithVariables
  and clear contentSid when using translated body to ensure Twilio uses the
  translated text instead of the original template

- update.handler.ts: Change sourceLocale assignment from ?? to || for consistency
  with tasker payload behavior (line 481)

- ITranslationService.ts: Rename methods from plural to singular naming:
  - getWorkflowStepTranslations -> getWorkflowStepTranslation
  - getEventTypeTranslations -> getEventTypeTranslation
  Updated all call sites and tests accordingly

Co-Authored-By: unknown <>

* fix: address Cubic AI review feedback (confidence 9/10+ issues)

- Fix getSMSMessageWithVariables to handle WHATSAPP_ATTENDEE action for
  locale and timezone (confidence 9/10)
- Remove WhatsApp translation feature that set contentSid to undefined
  since Twilio ignores body parameter for WhatsApp and requires
  pre-approved Message Templates (confidence 10/10)

Co-Authored-By: unknown <>

* fix: translatio

* Add tests: packages/features/eventTypeTranslation/repositories/EventTypeTranslationRepository.test.ts

Generated by Paragon from proposal for PR #27087

* Add tests: packages/features/tasker/tasks/translateWorkflowStepData.test.ts

Generated by Paragon from proposal for PR #27087

* chore: nit

* chore: verfied atg

* fix: set sourceLocale for new steps, add shouldDirty to checkbox, remove spec docs

- Set sourceLocale fallback in addedSteps mapping to fix stale detection mismatch
- Add { shouldDirty: true } to autoTranslateEnabled checkbox onChange
- Remove specs/workflow-translation/ directory (planning docs, not for repo)

Co-authored-by: Udit Takkar <udit.07.takkar@gmail.com>
Co-Authored-By: unknown <>

* chore: add specs back

* fix: type error

* fix: type error

* fix: type err

* fix: tests

* refactor: feedback

* fix: type err

* refactor

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Udit Takkar <udit.takkar@cal.com>
Co-authored-by: Udit Takkar <udit.07.takkar@gmail.com>
2026-02-25 01:03:55 +05:30

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# Workflow Translation Decisions
## ADR-001: Pre-translate vs On-demand Translation
### Context
Need to decide when translations are generated - at workflow save time or at send time.
### Options Considered
1. **On-demand at send time** — Translate when sending to attendee, cache for reuse
- Pros: Fewer API calls, no unused translations
- Cons: Slight delay on first send to new locale
2. **Pre-translate at save time** — Translate to all 19 locales when workflow saved
- Pros: No delay at send time, matches event type pattern
- Cons: More upfront API calls
### Decision
Pre-translate at save time (option 2) to match the existing event type translation pattern and ensure no delay when sending notifications.
### Consequences
- Translations generated via async tasker task when workflow step is saved
- ~36 API calls per workflow step (18 locales × 2 fields)
- Database stores all translations upfront
## ADR-002: Organization-only Feature
### Context
Need to decide if feature is available to all users or restricted.
### Decision
Organization users only, matching the event type auto-translation feature.
### Consequences
- UI toggle only shown for org users
- Handler checks `ctx.user.organizationId` before triggering translation