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/v2.5_service_orders.sql

@@ -0,0 +1,90 @@
+-- v2.5 Service Orders (Kanban) for workshop management
+
+CREATE TABLE IF NOT EXISTS service_orders (
+    id SERIAL PRIMARY KEY,
+    tenant_id INTEGER NOT NULL,
+    branch_id INTEGER REFERENCES branches(id),
+    customer_id INTEGER REFERENCES customers(id),
+    vehicle_id INTEGER REFERENCES fleet_vehicles(id), -- optional link to fleet
+    order_number VARCHAR(50) UNIQUE, -- human-readable SO-2026-0001
+    status VARCHAR(30) DEFAULT 'received', -- received, diagnosis, waiting_parts, repair, quality_check, ready, delivered, cancelled
+    priority VARCHAR(20) DEFAULT 'normal', -- low, normal, high, urgent
+    reception_notes TEXT,
+    diagnosis_notes TEXT,
+    repair_notes TEXT,
+    delivery_notes TEXT,
+    estimated_cost NUMERIC(12,2),
+    final_cost NUMERIC(12,2),
+    estimated_completion TIMESTAMPTZ,
+    actual_completion TIMESTAMPTZ,
+    delivered_at TIMESTAMPTZ,
+    delivered_by INTEGER REFERENCES employees(id),
+    employee_id INTEGER REFERENCES employees(id), -- assigned mechanic/technician
+    mileage_in INTEGER,
+    mileage_out INTEGER,
+    fuel_level VARCHAR(20), -- empty, quarter, half, three_quarters, full
+    created_by INTEGER REFERENCES employees(id),
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_so_status ON service_orders(status);
+CREATE INDEX IF NOT EXISTS idx_so_customer ON service_orders(customer_id);
+CREATE INDEX IF NOT EXISTS idx_so_branch ON service_orders(branch_id);
+CREATE INDEX IF NOT EXISTS idx_so_created ON service_orders(created_at DESC);
+
+-- Service order items (parts needed/used)
+CREATE TABLE IF NOT EXISTS service_order_items (
+    id SERIAL PRIMARY KEY,
+    service_order_id INTEGER NOT NULL REFERENCES service_orders(id) ON DELETE CASCADE,
+    inventory_id INTEGER REFERENCES inventory(id),
+    part_number VARCHAR(50),
+    name VARCHAR(300),
+    quantity NUMERIC(10,2) DEFAULT 1,
+    unit_cost NUMERIC(12,2),
+    unit_price NUMERIC(12,2),
+    status VARCHAR(20) DEFAULT 'pending', -- pending, ordered, received, installed, cancelled
+    notes TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_soi_order ON service_order_items(service_order_id);
+
+-- Service order labor / work items
+CREATE TABLE IF NOT EXISTS service_order_labor (
+    id SERIAL PRIMARY KEY,
+    service_order_id INTEGER NOT NULL REFERENCES service_orders(id) ON DELETE CASCADE,
+    description TEXT NOT NULL,
+    hours NUMERIC(6,2) DEFAULT 0,
+    hourly_rate NUMERIC(12,2) DEFAULT 0,
+    total_cost NUMERIC(12,2) DEFAULT 0,
+    employee_id INTEGER REFERENCES employees(id), -- mechanic who did the work
+    status VARCHAR(20) DEFAULT 'pending', -- pending, in_progress, completed
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_sol_order ON service_order_labor(service_order_id);
+
+-- Status history for audit trail
+CREATE TABLE IF NOT EXISTS service_order_status_history (
+    id SERIAL PRIMARY KEY,
+    service_order_id INTEGER NOT NULL REFERENCES service_orders(id) ON DELETE CASCADE,
+    old_status VARCHAR(30),
+    new_status VARCHAR(30) NOT NULL,
+    changed_by INTEGER REFERENCES employees(id),
+    notes TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_sosh_order ON service_order_status_history(service_order_id);
+
+-- Trigger to auto-update updated_at
+CREATE OR REPLACE FUNCTION update_so_updated_at()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS trg_service_orders_updated_at ON service_orders;
+CREATE TRIGGER trg_service_orders_updated_at
+    BEFORE UPDATE ON service_orders
+    FOR EACH ROW
+    EXECUTE FUNCTION update_so_updated_at();