# Schema Completion Summary - To-do #2

## ✅ Status: COMPLETED

Svi elementi iz To-do #2 su uspešno implementirani i primenjeni na Supabase bazu "AI Woo Chat".

## Implementirane Komponente

### 1. ✅ pgvector Extension
- **File**: `20240101000001_enable_pgvector.sql`
- **Status**: Enabled
- **Purpose**: Vector similarity search for embeddings

### 2. ✅ Core Tables
- **tenants** (`20240101000002_create_tenants.sql`)
  - Multi-tenancy support
  - Status tracking (active/suspended/deleted)
  - Slug for URL-friendly identifiers

- **licenses** (`20240101000003_create_licenses.sql`)
  - License key management
  - Plan limits (JSONB with standardized keys)
  - Max sites configuration
  - Status tracking

- **sites** (`20240101000004_create_sites.sql`)
  - WordPress site linking
  - Status, environment (production/staging)
  - Allowed origins for CORS
  - Secret rotation tracking

### 3. ✅ Chat Tables
- **visitors** (`20240101000005_create_visitors.sql`)
  - Visitor tracking per site
  - Metadata (JSONB)
  - First/last seen timestamps

- **conversations** (`20240101000006_create_conversations.sql`)
  - Conversation tracking
  - Message count
  - Metadata (JSONB)

- **messages** (`20240101000007_create_messages.sql`)
  - `content_text` - Plain text content
  - `content_json` - Structured content (JSONB)
  - `token_usage` - Token tracking (JSONB)
  - Role (user/assistant/system)
  - Model tracking

### 4. ✅ Embeddings Table
- **embeddings** (`20240101000008_create_embeddings.sql`)
  - pgvector column (vector(1536))
  - HNSW index for fast similarity search
  - Versioning support
  - Entity type (product/page/policy)
  - Metadata (JSONB)

### 5. ✅ Ingestion Events
- **ingestion_events** (`20240101000009_create_ingestion_events.sql`)
  - Idempotency via `event_id` unique constraint
  - Event type tracking
  - Status (pending/processing/completed/failed)
  - Metadata (JSONB)

### 6. ✅ Settings with Versioning
- **settings** (`20240101000010_create_settings.sql`)
  - Key-value pairs (JSONB values)
  - Version tracking
  - Active/inactive flags

- **settings_history** (`20240101000010_create_settings.sql`)
  - Full version history
  - Change tracking (who, when, why)
  - Automatic history creation via trigger

### 7. ✅ Usage Tracking Tables
- **usage_events** (`20240101000011_create_usage_tables.sql`)
  - All OpenAI API usage logging
  - Token tracking
  - Cost calculation
  - Success/error tracking

- **usage_daily** (`20240101000011_create_usage_tables.sql`)
  - Daily aggregation per site
  - Chat/embedding request counts
  - Total tokens and estimated cost

### 8. ✅ Roles & Audit
- **user_tenants** (`20240101000012_create_roles_and_audit.sql`)
  - Tenant-level roles (owner/admin/support)

- **platform_users** (`20240101000012_create_roles_and_audit.sql`)
  - Platform-level super_admin role

- **audit_logs** (`20240101000012_create_roles_and_audit.sql`)
  - Full audit trail
  - Old/new values (JSONB)
  - Metadata (JSONB)
  - IP address and user agent tracking

### 9. ✅ Additional Tables
- **chat_events** (`20240101000013_create_chat_events.sql`)
  - User interaction events (view/click/add_to_cart/purchase)
  - Payload (JSONB)

## Indexes Created

### Foreign Key Indexes
- All FK columns have indexes for efficient joins

### JSONB Indexes (GIN)
- `licenses.plan_limits`
- `visitors.metadata`
- `conversations.metadata`
- `messages.content_json`
- `messages.token_usage`
- `embeddings.metadata`
- `ingestion_events.metadata`
- `settings.value`
- `settings_history.*`
- `audit_logs.old_values`
- `audit_logs.new_values`
- `audit_logs.metadata`
- `chat_events.payload`

### Vector Index (HNSW)
- `embeddings.embedding` - HNSW index for cosine similarity search

### Standard Indexes
- Status columns
- Timestamp columns
- Unique constraints
- Composite indexes for common queries

## RLS Policies

### Tenant Isolation
All tables have RLS policies that:
- Allow users to view data for their tenants
- Allow super_admin to view all data
- Allow service role to manage all data

### Runtime Tables
Tables used by runtime (visitors, conversations, messages, chat_events):
- Service role can manage all records
- No user-level access (public endpoints use service role)

## Helper Functions

1. **`is_super_admin(user_id)`** - Check if user is super_admin
2. **`get_user_tenant_role(user_id, tenant_id)`** - Get user's role for tenant
3. **`log_audit_event(...)`** - Log audit events with full context
4. **`validate_plan_limits()`** - Trigger function to ensure plan_limits structure
5. **`create_settings_history()`** - Trigger function for settings versioning

## Migration Files Applied

1. `20240101000001_enable_pgvector.sql`
2. `20240101000002_create_tenants.sql`
3. `20240101000003_create_licenses.sql`
4. `20240101000004_create_sites.sql`
5. `20240101000005_create_visitors.sql`
6. `20240101000006_create_conversations.sql`
7. `20240101000007_create_messages.sql`
8. `20240101000008_create_embeddings.sql`
9. `20240101000009_create_ingestion_events.sql`
10. `20240101000010_create_settings.sql`
11. `20240101000011_create_usage_tables.sql`
12. `20240101000012_create_roles_and_audit.sql`
13. `20240101000013_create_chat_events.sql`
14. `20240101000014_update_rls_policies.sql`
15. `20240115000003_standardize_plan_limits.sql`
16. `20240116000001_update_sites_table.sql`
17. `20240116000002_update_licenses_table.sql`

## Verification

All migrations have been successfully applied to the remote database:
- Project: AI Woo Chat
- Project ID: drmuwsxyvvfivdfsyydy
- Status: All migrations applied ✅

## Next Steps

The database schema is now complete and ready for:
1. Application development
2. Data seeding (if needed)
3. API implementation
4. Testing