Mejoras de sesion: estabilizacion, IA, Nexus Yonke y marketplace B2B

- F0 blindaje: Redis/Celery, pg_hba sin trust LAN, secretos a env 600, backups, webhook auth, jobs muertos
- F1 caja: bugs POS, reembolsos al corte, apartados, CFDI, topes de descuento en cotizacion/apartado
- F2/F7 IA de catalogo: autocategorizacion, dedup de SKUs con embeddings, OCR de facturas, descripciones, claves SAT, limpieza de fitment
- F3 IA en el flujo: vision Yonke, preguntas MeLi, venta cruzada, anomalias, sinonimos, busqueda semantica (rerank/embeddings)
- F4/F8 escala y cartera: /metrics+Prometheus+Grafana, pool, score de credito, churn, metricas multi-tenant
- Nexus Yonke (M1-M6): modelo de datos 1-de-1, alta por donador, vitrina publica, MeLi usado, consignacion, garantia por dias, reportes, etiquetas
- Marketplace B2B entre yonkes (catalogo + pedidos cross-tenant)
- Seguridad: auth en /api/admin/* (35 endpoints), alertas por tenant
- Migraciones v4.27/v4.28; timers expire-demos y rollup-metrics

pos/migrations/v3.2_db_performance.sql

@@ -2,15 +2,20 @@
 -- Applies to: master DB (nexus_autoparts) and all tenant DBs
 
 -- ─── MASTER DB ─────────────────────────────────
+-- These indexes only exist in the master DB (nexus_autoparts). On tenant DBs
+-- (the `parts`/`warehouse_inventory` OEM tables live only in master) they are
+-- skipped via existence guards so this migration can run against tenants too.
 
--- Index for parts name lookups (used by get_part_types, shop supplies)
-CREATE INDEX IF NOT EXISTS idx_parts_name_part ON parts(name_part);
-CREATE INDEX IF NOT EXISTS idx_parts_name_part_pattern ON parts(name_part text_pattern_ops);
-
--- Partial index for warehouse_inventory stock lookups (already created in Fase 1,
--- kept here for completeness on fresh installs)
-CREATE INDEX IF NOT EXISTS idx_wi_part_stock_positive
-ON warehouse_inventory(part_id) WHERE stock_quantity > 0;
+DO $$
+BEGIN
+    IF to_regclass('public.parts') IS NOT NULL THEN
+        EXECUTE 'CREATE INDEX IF NOT EXISTS idx_parts_name_part ON parts(name_part)';
+        EXECUTE 'CREATE INDEX IF NOT EXISTS idx_parts_name_part_pattern ON parts(name_part text_pattern_ops)';
+    END IF;
+    IF to_regclass('public.warehouse_inventory') IS NOT NULL THEN
+        EXECUTE 'CREATE INDEX IF NOT EXISTS idx_wi_part_stock_positive ON warehouse_inventory(part_id) WHERE stock_quantity > 0';
+    END IF;
+END $$;
 
 -- ─── TENANT DB (run on each tenant) ────────────