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database/03_create_scheduled_messages.sql

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+-- ============================================
+-- MIGRACIÓN: 03_create_scheduled_messages
+-- Fecha: 2026-02-03
+-- Descripción: Crear tabla y vista para sistema de mensajes programados/recordatorios
+--              Permite programar envío de plantillas WhatsApp en fechas/horas específicas
+-- Nota: Usa IF NOT EXISTS / OR REPLACE - Es seguro ejecutar múltiples veces
+-- ============================================
+
+-- Tabla para mensajes programados y recordatorios
+CREATE TABLE IF NOT EXISTS scheduled_messages (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    user_id INT NOT NULL,
+    template_id INT NULL,
+    template_name VARCHAR(100) NULL,
+    template_language VARCHAR(10) DEFAULT 'es',
+    template_parameters JSON NULL COMMENT 'Parámetros para las variables de la plantilla',
+    message_type ENUM('text', 'template') DEFAULT 'template',
+    message_content TEXT NULL COMMENT 'Contenido del mensaje si es tipo text',
+    scheduled_date DATE NOT NULL,
+    scheduled_time TIME NOT NULL,
+    status ENUM('pending', 'sent', 'failed', 'cancelled') DEFAULT 'pending',
+    sent_at DATETIME NULL,
+    error_message TEXT NULL,
+    created_by INT NULL COMMENT 'ID del admin que creó el recordatorio',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    
+    INDEX idx_user_id (user_id),
+    INDEX idx_scheduled_date (scheduled_date),
+    INDEX idx_status (status),
+    INDEX idx_scheduled_datetime (scheduled_date, scheduled_time, status),
+    
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Vista para facilitar consultas con información del usuario
+CREATE OR REPLACE VIEW scheduled_messages_view AS
+SELECT 
+    sm.*,
+    u.name as user_name,
+    u.phone_number,
+    mt.name as template_display_name,
+    mt.body_text as template_body,
+    mt.status as template_status
+FROM scheduled_messages sm
+LEFT JOIN users u ON sm.user_id = u.id
+LEFT JOIN message_templates mt ON sm.template_id = mt.id
+ORDER BY sm.scheduled_date DESC, sm.scheduled_time DESC;