---
phase: 01-foundation-auth
plan: 02
subsystem: database
tags: [supabase, postgresql, rls, multi-tenant, auth]

# Dependency graph
requires:
  - phase: none
    provides: First database schema
provides:
  - plans table with Free, Creator, Pro tiers
  - profiles table with auto-creation trigger
  - RLS policies for tenant isolation
  - Helper functions for plan feature checking
affects: [01-03-supabase-client, 01-04-auth-ui, 02-social-accounts]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "RLS with (SELECT auth.uid()) subquery for performance"
    - "SECURITY DEFINER functions for bypassing RLS"
    - "Auto-profile creation via auth.users trigger"
    - "JSONB for flexible feature flags"

key-files:
  created:
    - supabase/migrations/001_initial_auth_setup.sql
    - supabase/seed.sql
    - docs/DATABASE.md
  modified: []

key-decisions:
  - "tenant_id in profiles table, not JWT (simpler for v1)"
  - "Plans seeded in migration, not seed file (always exist)"
  - "JSONB features for flexible plan limits"
  - "Italian display names for i18n readiness"

patterns-established:
  - "RLS Policy Pattern: Use (SELECT auth.uid()) for 99% performance improvement"
  - "Auto-profile Pattern: Trigger creates profile on auth.users insert"
  - "Helper Function Pattern: SECURITY DEFINER for cross-table queries"

# Metrics
duration: 5min
completed: 2026-01-31
---

# Phase 01 Plan 02: Database Schema Summary

**Multi-tenant auth schema with plans table, profiles table, RLS policies, and auto-profile trigger for Supabase**

## Performance

- **Duration:** 5 min
- **Started:** 2026-01-31T03:24:00Z
- **Completed:** 2026-01-31T03:29:00Z
- **Tasks:** 3
- **Files created:** 3

## Accomplishments

- Created plans table with Free, Creator, Pro tiers (0, 19, 49 EUR/month)
- Created profiles table with tenant_id for multi-tenant isolation
- Enabled RLS on all tables with optimized policies
- Added auto-profile creation trigger on user signup
- Added helper functions for plan limit checking
- Documented complete schema with security notes

## Task Commits

Each task was committed atomically:

1. **Task 1: Create database migration with plans and profiles** - `f271d7f` (feat)
2. **Task 2: Create seed file for development** - `16b3053` (feat)
3. **Task 3: Document database schema** - `fd56b12` (docs)

## Files Created

- `supabase/migrations/001_initial_auth_setup.sql` - Complete auth schema with RLS
- `supabase/seed.sql` - Development verification seed
- `docs/DATABASE.md` - Schema documentation with examples

## Decisions Made

1. **tenant_id in profiles, not JWT** - Simpler approach for v1, avoids JWT refresh complexity
2. **Plans in migration, not seed** - Plans must always exist, migration guarantees this
3. **JSONB for features** - Flexible structure for plan limits, easy to extend
4. **Italian display names** - i18n ready from day 1

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

**Database migration must be applied to Supabase.** See `docs/DATABASE.md` for:
- SQL Editor copy/paste method
- Supabase CLI method
- Direct psql connection method

## Next Phase Readiness

- Schema ready for Supabase project creation (01-03)
- Plans table ready for auth flow (01-04)
- Profiles auto-creation ready for signup testing
- RLS policies ready for security verification

---
*Phase: 01-foundation-auth*
*Completed: 2026-01-31*