costco-grocery-list/IMPLEMENTATION_STATUS.md

Multi-Household Implementation - Quick Reference

Implementation Status

✅ Sprint 1: Database Foundation (COMPLETE)

• Created migration script: multi_household_architecture.sql
• Created migration guide: MIGRATION_GUIDE.md
• Created migration runner scripts: run-migration.sh / run-migration.bat
• Tested migration on 'grocery' database (copy of Costco)
• Migration successful - all data migrated correctly
• Verification passed - 0 data integrity issues

Migration Results:

• ✅ 1 Household created: "Main Household" (invite code: MAIN755114)
• ✅ 7 Users migrated (2 system_admins, 5 standard users)
• ✅ 122 Items extracted to master catalog
• ✅ 122 Household lists created
• ✅ 27 Classifications migrated
• ✅ 273 History records preserved
• ✅ All users assigned to household (admin/user roles)
• ✅ 0 orphaned records or data loss

Database: grocery (using Costco as template for safety)

⏳ Sprint 2: Backend API (NEXT - READY TO START)

• Create household.model.js
• Create store.model.js
• Update list.model.js for household+store scope
• Create householdAccess middleware
• Create storeAccess middleware
• Create households.controller.js
• Create stores.controller.js
• Update lists.controller.js
• Update users.controller.js
• Create/update routes for new structure

⏳ Sprint 3: Frontend Core (PENDING)

• Refactor contexts
• Create household UI
• Create store UI

New Database Schema

Core Tables

1. households - Household entities with invite codes
2. stores - Store types (Costco, Target, etc.)
3. household_members - User membership with per-household roles
4. household_stores - Which stores each household uses
5. items - Master item catalog (shared)
6. household_lists - Lists scoped to household + store
7. household_item_classifications - Classifications per household + store
8. household_list_history - History tracking

Key Relationships

• User → household_members → Household (many-to-many)
• Household → household_stores → Store (many-to-many)
• Household + Store → household_lists → Item (unique per combo)
• household_lists → household_list_history (one-to-many)

Role System

System-Wide (users.role)

• system_admin: App infrastructure control
• user: Standard user

Household-Scoped (household_members.role)

• admin: Full household control
• user: Standard member

Migration Steps

1. Backup: pg_dump grocery_list > backup.sql
2. Run: psql -d grocery_list -f backend/migrations/multi_household_architecture.sql
3. Verify: Check counts, run integrity queries
4. Test: Ensure app functionality
5. Cleanup: Drop old tables after verification

API Changes (Planned)

Old Format

GET /api/list
POST /api/list/add

New Format

GET /api/households/:hId/stores/:sId/list
POST /api/households/:hId/stores/:sId/list/add

Frontend Changes (Planned)

New Contexts

const { user, isSystemAdmin } = useAuth();
const { activeHousehold, isAdmin } = useHousehold();
const { activeStore, householdStores } = useStore();

New Routes

/households                    - List households
/households/:id/stores/:sId    - Grocery list
/households/:id/members        - Manage members
/join/:inviteCode              - Join household

Development Workflow

Phase 1: Database (Current)

1. Review migration script
2. Test on local dev database
3. Run verification queries
4. Document any issues

Phase 2: Backend API (Next)

1. Create household.model.js
2. Create store.model.js
3. Update list.model.js for household scope
4. Create middleware for household access
5. Update routes

Phase 3: Frontend

1. Refactor AuthContext → useAuth()
2. Create HouseholdContext → useHousehold()
3. Create StoreContext → useStore()
4. Build household switcher
5. Build store tabs

Testing Checklist

Database Migration

• All tables created
• All indexes created
• Users migrated to household
• Items deduplicated correctly
• Lists migrated with correct references
• Classifications preserved
• History preserved
• No NULL foreign keys

Backend API

• Household CRUD works
• Member management works
• Invite codes work
• Store management works
• List operations scoped correctly
• Permissions enforced
• History tracked correctly

Frontend UI

• Login/logout works
• Household switcher works
• Store tabs work
• Can create household
• Can join household
• Can add items
• Can mark bought
• Roles respected in UI

Rollback Strategy

If migration fails:

ROLLBACK;

If issues found after:

psql -d grocery_list < backup.sql

Support Resources

• Migration Script: backend/migrations/multi_household_architecture.sql
• Guide: backend/migrations/MIGRATION_GUIDE.md
• Architecture: docs/multi-household-architecture-plan.md
• Status: This file

Key Decisions

1. ✅ Keep users.role for system admin
2. ✅ Simplify household roles to admin/user
3. ✅ Preserve user names in history (no anonymization)
4. ✅ Shared item catalog with household-specific lists
5. ✅ Context pattern refactoring (internal context + custom hooks)

Timeline

• Week 1-2: Database migration + testing
• Week 3-4: Backend API implementation
• Week 5-6: Frontend core implementation
• Week 7: Member management
• Week 8-9: Testing & polish
• Week 10: Production migration

Contact

For questions or issues during implementation, refer to:

• Architecture plan for design decisions
• Migration guide for database steps
• This file for quick status updates