---
phase: 30-onboarding-redesign
plan: 01
subsystem: api
tags: [hono, drizzle, zod, discovery, onboarding]

requires:
  - phase: 28-profile-and-logto-integration
    provides: catalog infrastructure (globalItems, tags, globalItemTags tables)
provides:
  - shared hobby-to-tag mapping config
  - popular items by tags discovery endpoint
  - batch onboarding completion endpoint with auto-category creation
affects: [30-02, 30-03]

tech-stack:
  added: []
  patterns: [hobby-tag mapping as shared config, batch item creation with auto-categories]

key-files:
  created:
    - src/shared/hobbyConfig.ts
    - src/server/services/onboarding.service.ts
    - src/server/routes/onboarding.ts
  modified:
    - src/server/services/discovery.service.ts
    - src/server/routes/discovery.ts
    - src/shared/schemas.ts
    - src/server/index.ts

key-decisions:
  - "Hobby-tag mapping as static shared config (no DB table) — extensible by editing hobbyConfig.ts"
  - "Popular items sorted by owner count using COUNT(DISTINCT items.id) via LEFT JOIN"
  - "Onboarding completion upserts settings using onConflictDoUpdate pattern"

patterns-established:
  - "Shared config in src/shared/ for client+server constants"
  - "Batch item creation with auto-category creation from catalog metadata"

requirements-completed: []

duration: 8min
completed: 2026-04-12
---

# Plan 30-01: Backend Onboarding Infrastructure Summary

**Shared hobby config, popular-items-by-tags endpoint with owner count ordering, and batch onboarding completion service with auto-category creation**

## Performance

- **Duration:** 8 min
- **Tasks:** 5
- **Files modified:** 7

## Accomplishments
- Created shared hobby configuration with 6 hobbies mapped to catalog tags
- Added `getPopularItemsByTags` query to discovery service with owner count ordering
- Added `GET /api/discovery/popular-items?tags=` endpoint with image URL enrichment
- Created onboarding service that batch-creates user items from catalog selections with auto-generated categories
- Created `POST /api/onboarding/complete` endpoint with Zod validation (max 50 items)

## Task Commits

1. **Task 1: Create shared hobby configuration** - `d37e64e` (feat)
2. **Task 2: Add popular-items-by-tags query** - `2347d49` (feat)
3. **Task 3: Add popular-items endpoint** - `d647080` (feat)
4. **Task 4: Create onboarding service** - `9da4c84` (feat)
5. **Task 5: Create onboarding route + register** - `5b35e60` (feat)

**Lint fix:** `9448571` (fix: import ordering)

## Files Created/Modified
- `src/shared/hobbyConfig.ts` - Hobby definitions with tag mappings and getTagsForHobbies helper
- `src/server/services/discovery.service.ts` - Added getPopularItemsByTags with owner count SQL
- `src/server/routes/discovery.ts` - Added /popular-items GET endpoint
- `src/server/services/onboarding.service.ts` - Batch item creation with auto-category logic
- `src/server/routes/onboarding.ts` - POST /complete with Zod validation
- `src/shared/schemas.ts` - Added completeOnboardingSchema
- `src/server/index.ts` - Registered onboarding routes

## Decisions Made
None - followed plan as specified.

## Deviations from Plan
None - plan executed exactly as written.

## Issues Encountered
- Biome lint flagged import ordering in discovery.service.ts and onboarding.ts — fixed in a follow-up commit.

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Backend endpoints ready for frontend consumption in Plan 02
- Hobby config importable from both client and server code

---
*Phase: 30-onboarding-redesign*
*Completed: 2026-04-12*
