diff --git a/schemas/notifications.sql b/schemas/notifications.sql
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+++ b/schemas/notifications.sql
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+-- ============================================
+-- Schema: notifications
+-- Épica: MCH-017 - Notificaciones
+-- Version: 1.0.0
+-- ============================================
+
+-- Create schema
+CREATE SCHEMA IF NOT EXISTS notifications;
+
+-- ============================================
+-- Table: notifications
+-- Stores all notification records
+-- ============================================
+CREATE TABLE notifications.notifications (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+    user_id UUID,
+    customer_id UUID,
+    type VARCHAR(50) NOT NULL,
+    channel VARCHAR(20) NOT NULL,
+    title VARCHAR(255) NOT NULL,
+    body TEXT NOT NULL,
+    data JSONB,
+    status VARCHAR(20) NOT NULL DEFAULT 'pending',
+    error_message TEXT,
+    retry_count INTEGER DEFAULT 0,
+    scheduled_at TIMESTAMPTZ,
+    sent_at TIMESTAMPTZ,
+    delivered_at TIMESTAMPTZ,
+    read_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Indexes
+CREATE INDEX idx_notifications_tenant_user_status
+    ON notifications.notifications(tenant_id, user_id, status);
+CREATE INDEX idx_notifications_tenant_created
+    ON notifications.notifications(tenant_id, created_at);
+CREATE INDEX idx_notifications_scheduled
+    ON notifications.notifications(scheduled_at)
+    WHERE scheduled_at IS NOT NULL AND status = 'pending';
+
+-- ============================================
+-- Table: notification_templates
+-- Notification templates per type and channel
+-- ============================================
+CREATE TABLE notifications.notification_templates (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID, -- NULL = default template
+    type VARCHAR(50) NOT NULL,
+    channel VARCHAR(20) NOT NULL,
+    title VARCHAR(255) NOT NULL,
+    body TEXT NOT NULL,
+    variables JSONB, -- List of required variables
+    active BOOLEAN DEFAULT true,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(tenant_id, type, channel)
+);
+
+-- ============================================
+-- Table: notification_preferences
+-- User preferences per channel
+-- ============================================
+CREATE TABLE notifications.notification_preferences (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id UUID NOT NULL,
+    channel VARCHAR(20) NOT NULL,
+    enabled BOOLEAN DEFAULT true,
+    quiet_hours_enabled BOOLEAN DEFAULT false,
+    quiet_hours_start TIME,
+    quiet_hours_end TIME,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(user_id, channel)
+);
+
+-- ============================================
+-- Table: device_tokens
+-- FCM/APNs tokens for push notifications
+-- ============================================
+CREATE TABLE notifications.device_tokens (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id UUID NOT NULL,
+    platform VARCHAR(20) NOT NULL,
+    token TEXT NOT NULL UNIQUE,
+    device_name VARCHAR(100),
+    active BOOLEAN DEFAULT true,
+    last_used_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Indexes
+CREATE INDEX idx_device_tokens_user ON notifications.device_tokens(user_id);
+
+-- ============================================
+-- Default Templates (seed data)
+-- ============================================
+INSERT INTO notifications.notification_templates (tenant_id, type, channel, title, body, variables) VALUES
+-- Order notifications
+(NULL, 'new_order', 'push', '🛒 Nuevo Pedido #{{order_id}}', 'Pedido de {{customer_name}} por ${{total}}', '["order_id", "customer_name", "total"]'),
+(NULL, 'new_order', 'whatsapp', '🛒 *Nuevo Pedido*', 'Pedido #{{order_id}}\nCliente: {{customer_name}}\nTotal: ${{total}}\n\nRevisa tu app para confirmar.', '["order_id", "customer_name", "total"]'),
+
+(NULL, 'order_confirmed', 'whatsapp', '✅ *Pedido Confirmado*', '¡Tu pedido #{{order_id}} ha sido confirmado!\n\nEstamos preparándolo.\nTe avisamos cuando esté listo.', '["order_id"]'),
+
+(NULL, 'order_ready', 'push', '📦 Pedido Listo', 'Tu pedido #{{order_id}} está listo para recoger', '["order_id"]'),
+(NULL, 'order_ready', 'whatsapp', '📦 *Pedido Listo*', '¡Tu pedido #{{order_id}} está listo!\n\nPuedes pasar a recogerlo a:\n{{business_address}}', '["order_id", "business_address"]'),
+
+(NULL, 'order_delivered', 'whatsapp', '🎉 *Pedido Entregado*', '¡Tu pedido #{{order_id}} ha sido entregado!\n\nTotal: ${{total}}\n\n¡Gracias por tu compra!', '["order_id", "total"]'),
+
+(NULL, 'order_cancelled', 'whatsapp', '❌ *Pedido Cancelado*', 'Tu pedido #{{order_id}} ha sido cancelado.\n\nSi tienes dudas, contáctanos.', '["order_id"]'),
+
+-- Payment notifications
+(NULL, 'payment_received', 'push', '💰 Pago Recibido', 'Se recibió pago de ${{amount}} de {{customer_name}}', '["amount", "customer_name"]'),
+
+-- Alert notifications
+(NULL, 'low_stock', 'push', '⚠️ Stock Bajo', '{{product_name}}: quedan {{quantity}} unidades', '["product_name", "quantity"]'),
+
+(NULL, 'fiado_reminder', 'whatsapp', '💳 *Recordatorio de Pago*', 'Hola {{customer_name}},\n\nTe recordamos que tienes un saldo pendiente de ${{balance}} en {{business_name}}.\n\n¿Cuándo podrías pasar a abonar?', '["customer_name", "balance", "business_name"]'),
+
+-- Report notifications
+(NULL, 'daily_summary', 'push', '📊 Resumen del Día', 'Ventas: ${{total_sales}} | Pedidos: {{orders_count}}', '["total_sales", "orders_count"]'),
+
+(NULL, 'weekly_report', 'whatsapp', '📊 *Reporte Semanal*', '📈 Resumen de la semana:\n\n💰 Ventas: ${{total_sales}}\n📦 Pedidos: {{orders_count}}\n🎫 Ticket promedio: ${{avg_ticket}}\n\n¿Necesitas más detalles?', '["total_sales", "orders_count", "avg_ticket"]'),
+
+-- System notifications
+(NULL, 'welcome', 'whatsapp', '👋 *¡Bienvenido!*', '¡Hola {{name}}! Bienvenido a {{business_name}}.\n\nPuedes escribirme para:\n• Ver productos\n• Hacer pedidos\n• Consultar tu cuenta\n\n¿En qué te puedo ayudar?', '["name", "business_name"]');
+
+-- ============================================
+-- Updated_at trigger
+-- ============================================
+CREATE OR REPLACE FUNCTION notifications.update_updated_at()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_notifications_updated_at
+    BEFORE UPDATE ON notifications.notifications
+    FOR EACH ROW EXECUTE FUNCTION notifications.update_updated_at();
+
+CREATE TRIGGER trg_templates_updated_at
+    BEFORE UPDATE ON notifications.notification_templates
+    FOR EACH ROW EXECUTE FUNCTION notifications.update_updated_at();
+
+CREATE TRIGGER trg_preferences_updated_at
+    BEFORE UPDATE ON notifications.notification_preferences
+    FOR EACH ROW EXECUTE FUNCTION notifications.update_updated_at();
+
+CREATE TRIGGER trg_device_tokens_updated_at
+    BEFORE UPDATE ON notifications.device_tokens
+    FOR EACH ROW EXECUTE FUNCTION notifications.update_updated_at();