User: Should we use Redis or Memcached?
Assistant: Let me analyze both options...
[500 words of analysis]
Recommendation: Redis for pub/sub support.
User: Ok let's use Redis.

Decision: Use Redis (chosen for pub/sub support)

// 100 lines of UserService implementation

UserService: CRUD operations for users
- Methods: create, read, update, delete, findByEmail
- Dependencies: db, validator, logger
- Location: src/services/user.js

Error: Cannot read property 'id' of undefined
    at UserController.getUser (src/controllers/user.js:45:23)
    at Layer.handle [as handle_request] (node_modules/express/lib/router/layer.js:95:5)
    ... 20 more stack frames

Error: Cannot read 'id' of undefined @ src/controllers/user.js:45
Cause: User object is null when accessing .id

## Session Summary

### Decisions Made

- [D1] Use Redis for caching
- [D2] JWT for authentication

### Files Modified

- src/auth/jwt.js (new)
- src/config/redis.js (updated)

### Open Items

- [ ] Add rate limiting
- [ ] Write tests for JWT

Compress the last 10 messages for context handoff

## Context Summary (compressed from 10 messages)

### Task

Implementing user authentication with JWT

### Progress

1. Created JWT utility (src/auth/jwt.js)
2. Added login endpoint (src/routes/auth.js)
3. Tests failing - mock issue

### Key Decisions

- Using RS256 for JWT signing (security over performance)
- 1-hour token expiry with refresh tokens

### Current Issue

Jest mock for jwt.sign not working
Location: src/auth/**tests**/jwt.test.js:23

### Next Steps

1. Fix JWT mock
2. Add refresh token endpoint

cat .claude/context/memory/learnings.md