-- Create router monitoring table
CREATE TABLE IF NOT EXISTS `tbl_router_monitoring` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `router_id` int(11) NOT NULL,
  `timestamp` datetime NOT NULL,
  `ping_status` tinyint(1) NOT NULL DEFAULT 0,
  `api_status` tinyint(1) NOT NULL DEFAULT 0,
  `uptime` varchar(50) DEFAULT NULL,
  `free_memory` bigint(20) DEFAULT NULL,
  `total_memory` bigint(20) DEFAULT NULL,
  `cpu_load` int(11) DEFAULT NULL,
  `temperature` varchar(20) DEFAULT NULL,
  `voltage` varchar(20) DEFAULT NULL,
  `error` text DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `router_id` (`router_id`),
  KEY `timestamp` (`timestamp`),
  KEY `router_timestamp` (`router_id`, `timestamp`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Add monitoring columns to router table if they don't exist
ALTER TABLE `tbl_routers` 
ADD COLUMN IF NOT EXISTS `last_error` text DEFAULT NULL,
ADD COLUMN IF NOT EXISTS `offline_since` datetime DEFAULT NULL;