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+---
+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*