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/v2.2_alerts_warranty.sql

@@ -0,0 +1,82 @@
+-- v2.2_alerts_warranty.sql
+-- Mejora #7: Alertas de Reorden mejoradas
+-- Mejora #10: Garantías / RMA
+-- Mejora #1: Multi-sucursal sync helpers
+
+-- ═══════════════════════════════════════════════════════════════════════════
+-- ALERTAS DE REORDER
+-- ═══════════════════════════════════════════════════════════════════════════
+
+-- Add reorder columns to inventory
+ALTER TABLE inventory
+    ADD COLUMN IF NOT EXISTS reorder_point INTEGER,
+    ADD COLUMN IF NOT EXISTS reorder_qty INTEGER;
+
+-- Table to track generated reorder alerts (prevents duplicate notifications)
+CREATE TABLE IF NOT EXISTS reorder_alerts (
+    id SERIAL PRIMARY KEY,
+    inventory_id INTEGER NOT NULL REFERENCES inventory(id) ON DELETE CASCADE,
+    branch_id INTEGER REFERENCES branches(id),
+    alert_type VARCHAR(20) NOT NULL,  -- 'zero', 'low', 'over'
+    stock_at_alert INTEGER NOT NULL,
+    threshold INTEGER,
+    status VARCHAR(20) DEFAULT 'open',  -- open, acknowledged, resolved
+    po_id INTEGER REFERENCES purchase_orders(id),
+    employee_id INTEGER REFERENCES employees(id),
+    notes TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    resolved_at TIMESTAMPTZ
+);
+
+CREATE INDEX IF NOT EXISTS idx_reorder_alerts_inventory ON reorder_alerts(inventory_id);
+CREATE INDEX IF NOT EXISTS idx_reorder_alerts_status ON reorder_alerts(status);
+CREATE INDEX IF NOT EXISTS idx_reorder_alerts_created ON reorder_alerts(created_at DESC);
+
+-- ═══════════════════════════════════════════════════════════════════════════
+-- GARANTÍAS / RMA
+-- ═══════════════════════════════════════════════════════════════════════════
+
+-- Warranty registry attached to sale_items
+CREATE TABLE IF NOT EXISTS warranties (
+    id SERIAL PRIMARY KEY,
+    sale_id INTEGER REFERENCES sales(id) ON DELETE SET NULL,
+    sale_item_id INTEGER REFERENCES sale_items(id) ON DELETE SET NULL,
+    inventory_id INTEGER REFERENCES inventory(id) ON DELETE SET NULL,
+    customer_id INTEGER REFERENCES customers(id),
+    supplier_id INTEGER REFERENCES suppliers(id),
+    part_number VARCHAR(100),
+    name VARCHAR(300),
+    warranty_months INTEGER DEFAULT 0,
+    start_date DATE NOT NULL,
+    end_date DATE NOT NULL,
+    status VARCHAR(20) DEFAULT 'active',  -- active, claimed, expired, void
+    notes TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_warranties_sale ON warranties(sale_id);
+CREATE INDEX IF NOT EXISTS idx_warranties_customer ON warranties(customer_id);
+CREATE INDEX IF NOT EXISTS idx_warranties_status ON warranties(status);
+CREATE INDEX IF NOT EXISTS idx_warranties_end_date ON warranties(end_date);
+
+-- Warranty claims (RMA process)
+CREATE TABLE IF NOT EXISTS warranty_claims (
+    id SERIAL PRIMARY KEY,
+    warranty_id INTEGER NOT NULL REFERENCES warranties(id) ON DELETE CASCADE,
+    claim_date DATE NOT NULL DEFAULT CURRENT_DATE,
+    reason TEXT NOT NULL,
+    diagnosis TEXT,
+    resolution VARCHAR(20),  -- approved, rejected, repaired, replaced, refunded
+    replacement_inventory_id INTEGER REFERENCES inventory(id),
+    refund_amount NUMERIC(12,2),
+    labor_cost NUMERIC(12,2),
+    status VARCHAR(20) DEFAULT 'open',  -- open, in_review, resolved, closed
+    employee_id INTEGER REFERENCES employees(id),
+    supplier_rma_number VARCHAR(100),
+    notes TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    resolved_at TIMESTAMPTZ
+);
+
+CREATE INDEX IF NOT EXISTS idx_warranty_claims_warranty ON warranty_claims(warranty_id);
+CREATE INDEX IF NOT EXISTS idx_warranty_claims_status ON warranty_claims(status);