---
phase: 10-schema-foundation-pros-cons-fields
plan: "01"
subsystem: database
tags: [drizzle, sqlite, react, forms, zod]

# Dependency graph
requires: []
provides:
  - "pros/cons nullable TEXT columns on thread_candidates table (DB + migration)"
  - "Zod schema fields: pros/cons optional strings in createCandidateSchema"
  - "Service layer: createCandidate, updateCandidate, getThreadWithCandidates handle pros/cons"
  - "Client CandidateForm: Pros and Cons textarea inputs with pre-fill and submit payload"
  - "Client CandidateCard: purple +/- Notes badge when pros or cons text exists"
  - "CandidateResponse type includes pros/cons fields"
affects: [thread-ranking, candidate-comparison, future-candidate-features]

# Tech tracking
tech-stack:
  added: []
  patterns: [field-addition-ladder, tdd-red-green]

key-files:
  created:
    - drizzle/0004_soft_synch.sql
  modified:
    - src/db/schema.ts
    - tests/helpers/db.ts
    - src/server/services/thread.service.ts
    - src/shared/schemas.ts
    - src/client/hooks/useCandidates.ts
    - src/client/components/CandidateForm.tsx
    - src/client/components/CandidateCard.tsx
    - src/client/routes/threads/$threadId.tsx
    - tests/services/thread.service.test.ts

key-decisions:
  - "Empty string for pros/cons stored as-is by SQLite (not normalized to null) — updateCandidate test accepts empty string or null as cleared state"
  - "Pros/Cons textareas placed after Notes and before Product Link — logical grouping for research annotation"
  - "Visual indicator uses purple color scheme to distinguish from weight (blue), price (green), category (gray), and status badges"

patterns-established:
  - "Field-addition ladder: schema -> migration -> test helper -> service -> Zod -> types -> hook -> form -> card indicator"
  - "Test helper CREATE TABLE must mirror schema.ts columns exactly — column drift causes silent test failures"
  - "TDD: RED commit (failing tests) -> GREEN commit (implementation) per task"

requirements-completed: [RANK-03]

# Metrics
duration: 6min
completed: "2026-03-16"
---

# Phase 10 Plan 01: Schema Foundation Pros/Cons Fields Summary

**Nullable pros/cons TEXT columns added to thread_candidates from SQLite schema through Drizzle migration, service layer, Zod validation, React form inputs, and CandidateCard visual badge**

## Performance

- **Duration:** 6 min
- **Started:** 2026-03-16T20:30:18Z
- **Completed:** 2026-03-16T20:36:25Z
- **Tasks:** 2
- **Files modified:** 9

## Accomplishments
- Added pros/cons columns to threadCandidates schema and applied Drizzle migration (0004_soft_synch.sql)
- Wired pros/cons through all backend layers: service create/update/get + Zod schemas
- Added Pros and Cons textarea inputs to CandidateForm with pre-fill in edit mode
- Added purple "+/- Notes" badge to CandidateCard when either field has content
- 28 thread service tests passing (24 existing + 4 new) with zero regressions

## Task Commits

Each task was committed atomically:

1. **TDD RED - failing tests** - `719f708` (test)
2. **Task 1: Add pros/cons columns through backend + tests** - `7a64a18` (feat)
3. **Task 2: Wire pros/cons through client hooks, form, and card indicator** - `4f2aefe` (feat)

_Note: TDD task has separate test commit (RED) and implementation commit (GREEN)_

## Files Created/Modified
- `src/db/schema.ts` - Added pros/cons nullable TEXT columns to threadCandidates
- `drizzle/0004_soft_synch.sql` - Migration: ALTER TABLE thread_candidates ADD COLUMN pros/cons
- `tests/helpers/db.ts` - Mirrored pros/cons in CREATE TABLE thread_candidates
- `src/server/services/thread.service.ts` - pros/cons in createCandidate values(), updateCandidate Partial type, getThreadWithCandidates select
- `src/shared/schemas.ts` - pros/cons optional string fields in createCandidateSchema (updateCandidateSchema inherits via .partial())
- `src/client/hooks/useCandidates.ts` - pros/cons added to CandidateResponse interface
- `src/client/components/CandidateForm.tsx` - Pros and Cons textareas, FormData fields, INITIAL_FORM, pre-fill, payload
- `src/client/components/CandidateCard.tsx` - props, destructuring, purple +/- Notes badge
- `src/client/routes/threads/$threadId.tsx` - pros={candidate.pros} cons={candidate.cons} passed to CandidateCard
- `tests/services/thread.service.test.ts` - 4 new test cases for pros/cons create/update/get

## Decisions Made
- Empty string for pros/cons is stored as-is (not normalized to null on empty); the test accepts either empty string or null as "cleared" state since SQLite/Drizzle does not coerce empty strings.
- Visual indicator uses purple to distinguish from existing badge color scheme (blue=weight, green=price, gray=category, status has its own colors).
- Textarea placement (after Notes, before Product Link) groups annotation fields logically.

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

Pre-existing lint violations discovered in files outside the plan scope:
- `src/client/components/WeightSummaryCard.tsx`, `src/client/routes/collection/index.tsx`, `src/client/routes/index.tsx`, `src/client/routes/setups/$setupId.tsx` — format/organizeImports errors
- `.obsidian/workspace.json` — Biome format error (IDE file, should be excluded)

These are logged to `deferred-items.md` and not fixed (out of scope per deviation scope boundary rule).

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- RANK-03 fully implemented: pros/cons fields on candidates, editable via form, persisted in SQLite, with visual badge indicator
- Schema foundation complete — subsequent plans in phase 10 can build ranking/sorting features on top of this data
- No blockers

---
*Phase: 10-schema-foundation-pros-cons-fields*
*Completed: 2026-03-16*

## Self-Check: PASSED

All files and commits verified:
- All 10 key files present on disk
- All 3 task commits found in git log (719f708, 7a64a18, 4f2aefe)
- Key artifact strings confirmed in each file (pros: text, pros TEXT, pros: z.string, candidate-pros, pros || cons)