Propagated from erp-core v1.5.0:
- 5 tables: configs, payments, webhook_events, retry_queue, payment_links
- RLS policies for tenant isolation
- Indexes for performance
- Functions for retry backoff and expiration
Priority: P0 (CRITICAL for POS operations)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>