---
phase: 22-agent-streaming
plan: "00"
subsystem: database, ui, testing
tags: [drizzle, tailwind, tanstack-virtual, vitest, chat, agent-roles]

# Dependency graph
requires:
  - phase: 21-chat-foundation
    provides: chat_messages schema, ChatMessage type, existing chat UI components
provides:
  - updatedAt column on chat_messages table (migration 0048)
  - updatedAt field on ChatMessage shared type
  - @tanstack/react-virtual installed in ui workspace
  - agentRoleColors utility with 11 distinct themed role colors (THEME-03)
  - agentRoleColorDefault fallback
  - cursor-blink CSS animation with reduced-motion guard
  - 7 Wave 0 test stub files for Phase 22 components/hooks
affects: [22-01, 22-02, 22-03, 22-04, 22-05]

# Tech tracking
tech-stack:
  added: ["@tanstack/react-virtual"]
  patterns: ["agent-role-colors utility (Record<AgentRole, string> with light+dark variants)", "it.todo() Wave 0 test scaffolding (established in Phase 21)"]

key-files:
  created:
    - packages/db/src/migrations/0048_add_chat_messages_updated_at.sql
    - ui/src/lib/agent-role-colors.ts
    - ui/src/lib/agent-role-colors.test.ts
    - ui/src/hooks/useStreamingChat.test.ts
    - ui/src/components/ChatAgentSelector.test.tsx
    - ui/src/components/ChatMessage.test.tsx
    - ui/src/components/ChatSlashCommandPopover.test.tsx
    - ui/src/components/ChatMentionPopover.test.tsx
    - ui/src/components/ChatMessageIdentityBar.test.tsx
    - ui/src/components/ChatMessageList.test.tsx
  modified:
    - packages/db/src/schema/chat_messages.ts
    - packages/shared/src/types/chat.ts
    - ui/src/index.css
    - ui/package.json

key-decisions:
  - "THEME-03: 11 agent roles each assigned a unique Tailwind color class — pm=blue, engineer=violet, ceo=amber, general=slate, designer=pink, qa=orange, researcher=teal, devops=emerald, cto=indigo, cmo=rose, cfo=cyan"
  - "updatedAt on chat_messages is nullable (no .notNull()) — existing rows will have null until updated"

patterns-established:
  - "agentRoleColors pattern: Record<AgentRole, string> with 'text-X-600 dark:text-X-400' dual-variant format, mirrors status-colors.ts convention"
  - "CSS animation pattern: @keyframes + .animate-* class + @media prefers-reduced-motion guard"

requirements-completed: [THEME-03]

# Metrics
duration: 8min
completed: 2026-04-01
---

# Phase 22 Plan 00: Wave 0 Foundation Summary

**DB migration adding updated_at to chat_messages, ChatMessage type update, @tanstack/react-virtual install, 11-role agent-role-colors utility (THEME-03), cursor-blink CSS animation, and 7 Wave 0 test stubs**

## Performance

- **Duration:** 8 min
- **Started:** 2026-04-01T18:05:00Z
- **Completed:** 2026-04-01T18:13:00Z
- **Tasks:** 2
- **Files modified:** 14

## Accomplishments
- chat_messages schema and migration 0048 add nullable updated_at column
- @tanstack/react-virtual installed and ChatMessage type updated with updatedAt: string | null
- agent-role-colors.ts covers all 11 AgentRole values with visually distinct colors (THEME-03 — no two roles share a color), tested with 4-test suite
- cursor-blink CSS animation with prefers-reduced-motion guard added to index.css
- 7 test stub files created covering all Phase 22 components and hooks

## Task Commits

Each task was committed atomically:

1. **Task 1: DB migration, shared types, react-virtual, agent-role-colors, CSS animation** - `96b27119` (feat)
2. **Task 2: Wave 0 test stubs for Phase 22 components/hooks** - `baba7e3a` (test)

## Files Created/Modified
- `packages/db/src/migrations/0048_add_chat_messages_updated_at.sql` - ALTER TABLE to add updated_at with DEFAULT now()
- `packages/db/src/schema/chat_messages.ts` - Added updatedAt column (nullable timestamp)
- `packages/shared/src/types/chat.ts` - Added updatedAt: string | null to ChatMessage interface
- `ui/package.json` - Added @tanstack/react-virtual dependency
- `ui/src/lib/agent-role-colors.ts` - Record<AgentRole, string> with 11 distinct light+dark color pairs
- `ui/src/lib/agent-role-colors.test.ts` - 4 tests: coverage, dark variants, default, uniqueness
- `ui/src/index.css` - cursor-blink keyframes + .animate-cursor-blink + reduced-motion guard
- `ui/src/hooks/useStreamingChat.test.ts` - 5 it.todo() stubs
- `ui/src/components/ChatAgentSelector.test.tsx` - 5 it.todo() stubs
- `ui/src/components/ChatMessage.test.tsx` - 8 it.todo() stubs
- `ui/src/components/ChatSlashCommandPopover.test.tsx` - 5 it.todo() stubs
- `ui/src/components/ChatMentionPopover.test.tsx` - 4 it.todo() stubs
- `ui/src/components/ChatMessageIdentityBar.test.tsx` - 4 it.todo() stubs
- `ui/src/components/ChatMessageList.test.tsx` - 5 it.todo() stubs

## Decisions Made
- THEME-03: Each of the 11 roles gets a unique hue family — pm=blue, engineer=violet, ceo=amber, general=slate, designer=pink, qa=orange, researcher=teal, devops=emerald, cto=indigo, cmo=rose, cfo=cyan. Previous plans had duplicates (ceo+general yellow, etc.) which this corrects.
- updatedAt nullable (no .notNull()): existing rows left as null until touched, prevents data migration requirement.

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None — all acceptance criteria met on first attempt. TypeScript type check passes clean.

## Known Stubs
None — test stubs are intentional Wave 0 scaffolding (it.todo pattern), not data stubs. All 7 stub files will be implemented in Plans 22-01 through 22-05.

## Next Phase Readiness
- All Wave 0 foundations in place for Phase 22 Plans 01-05
- agent-role-colors.ts ready for ChatMessageIdentityBar (Plan 22-03)
- @tanstack/react-virtual ready for ChatMessageList virtualization (Plan 22-04)
- cursor-blink animation ready for ChatStreamingCursor (Plan 22-02)
- DB migration 0048 ready for server-side streaming response inclusion of updatedAt

---
*Phase: 22-agent-streaming*
*Completed: 2026-04-01*

## Self-Check: PASSED

All files verified present. Both task commits (96b27119, baba7e3a) verified in git log.
