FASE 4-5-6: Infraestructura, CRM, Service Orders, Notificaciones, Ahorro, Logistica, API Publica

FASE 4:
- Redis cache de stock con fallback graceful
- Multi-moneda (MXN/USD) con contabilidad en MXN
- Proveedores y ordenes de compra completo
- Meilisearch 1.5M+ partes indexadas
- Metabase KPIs con dashboard auto-generado

FASE 5:
- CRM mejorado: activities, tags, loyalty program, analytics
- Imagenes de partes: upload, resize, thumbnails WebP
- Ordenes de servicio Kanban: received->diagnosis->repair->ready->delivered
- Garantias/RMA, alertas de reorden, multi-sucursal
- Stubs BNPL (APLAZO) y ERP Sync (Aspel/Contpaqi)

FASE 6:
- Notificaciones automaticas: push/WhatsApp/email/in-app
- Reportes de ahorro vs retail_price
- Logistica + tracking: DHL, FedEx, Estafeta, 99min, Uber
- API Publica: API keys, rate limiting, catalog search

Migraciones: v1.9-v3.0
Tests: 93/93 pasando
Backup: nexus_backup_20260427_045859.tar.gz

pos/migrations/v2.3_metabase.sql

@@ -0,0 +1,18 @@
+-- v2.3_metabase.sql
+-- Mejora #5: Metabase KPIs
+--
+-- No schema changes required in tenant DB.
+-- Metabase runs as a separate Docker container and connects
+-- to PostgreSQL as a read-only BI user.
+--
+-- Prerequisites:
+--   - Docker and docker-compose installed
+--   - docker-compose.metabase.yml deployed
+--   - scripts/setup_metabase.py executed
+--
+-- Post-deployment:
+--   1. Start Metabase: docker compose -f docker-compose.metabase.yml up -d
+--   2. Run setup: python3 scripts/setup_metabase.py
+--   3. Access dashboard at http://<host>:3000
+--
+SELECT 'v2.3 metabase KPIs migration applied' as status;