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docs/context/compact-summary-2026-01-20.md

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+# Compact Summary - 2026-01-20
+
+## Quick Status
+
+✅ **Completed:** Tasks 1-8 (Backend multi-user support)
+🔜 **Next:** Task 9 - Settings page UI
+🧪 **Tests:** 15/15 passed
+🚀 **Server:** Running on http://0.0.0.0:8000
+
+---
+
+## What Was Done
+
+### Database Changes (database.py)
+- Added `user_id INTEGER DEFAULT 1` to exercise/meal/sleep/weight tables
+- Implemented user CRUD functions
+- Implemented data clear functions with preview
+- Updated all add/get functions to support user_id parameter
+
+### API Changes (app.py)
+- Added 7 user management endpoints
+- Added 2 data management endpoints
+- Updated all GET/POST data endpoints to use active user pattern
+- Added Pydantic models: UserResponse, UserInput, DataClearInput
+
+### Tests
+- All 15 tests passing (7 UserDB + 2 Migration + 6 DataClear)
+
+---
+
+## Key Architecture
+
+1. **Active User Pattern**: Only one user active at a time, all data operations scoped to active user
+2. **Default user_id = 1**: Backward compatibility with existing data
+3. **Data Isolation**: Each user's data completely isolated by user_id
+
+---
+
+## Critical Fix
+
+**Issue:** Missing user_id column in tables
+**Solution:** Added `user_id INTEGER DEFAULT 1` to CREATE TABLE statements in init_db()
+
+---
+
+## Next Steps
+
+1. Task 9: Create settings page UI with ui-ux-pro-max design
+2. Task 10: Add settings link to navigation
+3. Task 11: Run integration tests
+
+---
+
+## Design System
+
+- Primary: #3B82F6 (Blue)
+- CTA: #F97316 (Orange)
+- Background: #F8FAFC
+- Typography: Lora (headings) + Raleway (body)
+
+---
+
+## API Endpoints Added
+
+**User Management:**
+```
+GET    /api/users              GET    /api/users/active
+GET    /api/users/{id}         POST   /api/users
+PUT    /api/users/{id}         DELETE /api/users/{id}
+POST   /api/users/{id}/activate
+```
+
+**Data Management:**
+```
+POST   /api/data/preview-delete
+POST   /api/data/clear
+```
+
+---
+
+## Full Context
+
+See: `/docs/context/session-2026-01-20-settings-page.md`