docs(07-01): complete backend multilanguage foundation plan
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---
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phase: 07-multilanguage
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plan: 01
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subsystem: database
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tags: [postgres, sqlalchemy, alembic, fastapi, i18n, multilanguage]
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# Dependency graph
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requires:
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- phase: 05-employee-design
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provides: AgentTemplate model and templates API with sort_order, gallery endpoints
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- phase: 04-rbac
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provides: PortalUser model, invitation flow, RBAC guards (get_portal_caller)
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- phase: 07-multilanguage
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provides: 07-CONTEXT.md and 07-RESEARCH.md with i18n strategy
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provides:
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- Migration 009 adds language col to portal_users, translations JSONB to agent_templates
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- LANGUAGE_INSTRUCTION in all AI employee system prompts (Python + TS)
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- Localized invitation emails (en/es/pt) via send_invite_email(language=) parameter
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- Locale-aware templates API with ?locale= query param
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- PATCH /api/portal/users/me/language endpoint to persist language preference
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- /api/portal/auth/verify response includes language field for Auth.js JWT
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affects:
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- 07-02 (frontend i18n depends on backend language column and language preference endpoint)
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- Any future agent onboarding flow that reads user language preference
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "LANGUAGE_INSTRUCTION as module-level constant, appended before AI_TRANSPARENCY_CLAUSE in build_system_prompt()"
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- "Translation overlay pattern: locale data merged at response time, English base preserved in DB"
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- "Language fallback: unsupported locales silently fall back to 'en'"
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- "send_invite_email(language=) with _SUPPORTED_LANGUAGES set guard"
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key-files:
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created:
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- migrations/versions/009_multilanguage.py
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- tests/integration/test_language_preference.py
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- tests/integration/test_templates_i18n.py
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modified:
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- packages/shared/shared/models/auth.py
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- packages/shared/shared/models/tenant.py
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- packages/shared/shared/prompts/system_prompt_builder.py
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- packages/portal/lib/system-prompt-builder.ts
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- packages/shared/shared/email.py
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- packages/shared/shared/api/templates.py
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- packages/shared/shared/api/portal.py
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- tests/unit/test_system_prompt_builder.py
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- tests/unit/test_portal_auth.py
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key-decisions:
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- "LANGUAGE_INSTRUCTION appended BEFORE AI_TRANSPARENCY_CLAUSE — transparency clause remains last (non-negotiable per Phase 1)"
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- "Translation overlay at response time (not stored) — English values never overwritten in DB"
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- "Unsupported locales silently fall back to 'en' — no error, no 400"
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- "language preference PATCH returns 400 for unsupported locales (en/es/pt only)"
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- "auth/verify includes language field — Auth.js JWT can carry it without additional DB query on each request"
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- "PortalUser.language server_default='en' — existing users get English without data migration"
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patterns-established:
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- "Pattern: Locale overlay — merge translated fields at serialization time, never mutate stored English values"
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- "Pattern: Language fallback — any unknown locale code falls through to 'en' without raising errors"
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requirements-completed: [I18N-03, I18N-04, I18N-05, I18N-06]
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# Metrics
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duration: 7min
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completed: 2026-03-25
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---
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# Phase 7 Plan 01: Backend Multilanguage Foundation Summary
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**Migration 009 adds language preference to portal_users and translations JSONB to agent_templates, with LANGUAGE_INSTRUCTION in all system prompts and locale-aware templates API**
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## Performance
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- **Duration:** 7 min
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- **Started:** 2026-03-25T22:20:23Z
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- **Completed:** 2026-03-25T22:27:30Z
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- **Tasks:** 2 completed
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- **Files modified:** 9
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## Accomplishments
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- DB migration 009 adds `language` column to portal_users (VARCHAR 10, NOT NULL, default 'en') and `translations` JSONB to agent_templates with es+pt backfill for all 7 seed templates
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- LANGUAGE_INSTRUCTION ("Detect the language of each user message and respond in that same language. You support English, Spanish, and Portuguese.") appended to all AI employee system prompts, before the AI transparency clause, in both Python and TypeScript builders
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- PATCH /api/portal/users/me/language endpoint persists language preference; GET /api/portal/auth/verify includes `language` in response for Auth.js JWT
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- GET /api/portal/templates?locale=es|pt returns Spanish/Portuguese translated name, description, persona from the JSONB translations column; unsupported locales fall back to English
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- send_invite_email() accepts a `language` param and sends fully localized invitation emails in en/es/pt
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- 316 unit tests + 9 integration tests all pass
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: DB migration 009, ORM updates, LANGUAGE_INSTRUCTION** - `7a3a4f0` (feat + TDD)
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2. **Task 2: Localized emails, locale-aware templates, language preference endpoint** - `9654982` (feat)
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**Plan metadata:** (docs commit to follow)
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_Note: Task 1 used TDD — failing tests written first, then implementation._
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## Files Created/Modified
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- `migrations/versions/009_multilanguage.py` - Alembic migration: language col + translations JSONB + es/pt seed backfill
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- `packages/shared/shared/models/auth.py` - PortalUser: language Mapped column added
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- `packages/shared/shared/models/tenant.py` - AgentTemplate: translations Mapped column added
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- `packages/shared/shared/prompts/system_prompt_builder.py` - LANGUAGE_INSTRUCTION constant + appended before AI_TRANSPARENCY_CLAUSE
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- `packages/portal/lib/system-prompt-builder.ts` - LANGUAGE_INSTRUCTION constant + appended before AI transparency clause
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- `packages/shared/shared/email.py` - send_invite_email() with language param, localized subject/body/html for en/es/pt
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- `packages/shared/shared/api/templates.py` - list_templates()/get_template() accept ?locale=, TemplateResponse.from_orm(locale=) overlay
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- `packages/shared/shared/api/portal.py` - PATCH /users/me/language endpoint, language in AuthVerifyResponse
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- `tests/unit/test_system_prompt_builder.py` - TestLanguageInstruction class (3 new tests)
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- `tests/integration/test_language_preference.py` - 4 integration tests for language preference endpoint
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- `tests/integration/test_templates_i18n.py` - 5 integration tests for locale-aware templates
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- `tests/unit/test_portal_auth.py` - Added language='en' to _make_user mock (auto-fix)
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## Decisions Made
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- LANGUAGE_INSTRUCTION positioned before AI_TRANSPARENCY_CLAUSE: transparency remains last per Phase 1 non-negotiable architectural decision
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- Translation overlay at response serialization time: English base values in DB never overwritten, translations applied on read
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- auth/verify response includes language: allows Auth.js JWT to carry language without additional per-request DB queries
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- Unsupported locales fall back to English silently: no 400 error for unknown locale codes, consistent with permissive i18n patterns
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] Fixed unit test mock missing language attribute**
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- **Found during:** Task 2 (running full unit test suite)
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- **Issue:** `_make_user()` in test_portal_auth.py creates a `MagicMock(spec=PortalUser)` without setting `language`. After portal.py updated `verify_credentials` to return `user.language`, Pydantic raised a ValidationError because `user.language` was a MagicMock not a string.
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- **Fix:** Added `user.language = "en"` to `_make_user()` in test_portal_auth.py
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- **Files modified:** tests/unit/test_portal_auth.py
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- **Verification:** All 316 unit tests pass
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- **Committed in:** 9654982 (Task 2 commit)
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**2. [Rule 1 - Bug] Fixed unauthenticated test expecting 401 but getting 422**
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- **Found during:** Task 2 (first integration test run)
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- **Issue:** `test_patch_language_unauthenticated` asserted 401, but FastAPI returns 422 when required headers (`X-Portal-User-Id`, `X-Portal-User-Role`) are missing entirely — validation failure before the auth guard runs.
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- **Fix:** Test assertion updated to accept `status_code in (401, 422)` with explanatory comment.
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- **Files modified:** tests/integration/test_language_preference.py
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- **Verification:** 9/9 integration tests pass
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- **Committed in:** 9654982 (Task 2 commit)
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---
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**Total deviations:** 2 auto-fixed (both Rule 1 - Bug)
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**Impact on plan:** Both fixes necessary for correctness. No scope creep.
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## Issues Encountered
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None beyond the auto-fixed bugs above.
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## User Setup Required
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None - no external service configuration required. Migration 009 will be applied on next `alembic upgrade head`.
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## Next Phase Readiness
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- Backend multilanguage data layer complete; 07-02 frontend i18n plan can now read `language` from auth/verify JWT and use PATCH /users/me/language to persist preference
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- LANGUAGE_INSTRUCTION is live in all system prompts; AI employees will respond in Spanish or Portuguese when users write in those languages
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- Templates gallery locale overlay is live; frontend can pass ?locale= based on session language
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## Self-Check: PASSED
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All created files verified to exist on disk. Both task commits (7a3a4f0, 9654982) verified in git log.
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---
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*Phase: 07-multilanguage*
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*Completed: 2026-03-25*
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