CREATE TABLE IF NOT EXISTS live_callback_event (
    event_id      VARCHAR(256) PRIMARY KEY COMMENT '回调事件 ID',
    stream_name   VARCHAR(128) NOT NULL COMMENT '直播流名称',
    event_type    VARCHAR(32) NOT NULL COMMENT '回调事件类型',
    payload_hash  CHAR(64) NOT NULL COMMENT '回调载荷哈希',
    received_at   DATETIME NOT NULL COMMENT '接收时间',
    processed_at  DATETIME NULL COMMENT '处理时间',
    KEY idx_live_callback_stream (stream_name, event_type, received_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

DELIMITER $$
DROP PROCEDURE IF EXISTS upgrade_live_callback $$
CREATE PROCEDURE upgrade_live_callback()
BEGIN
    DECLARE item_count INT DEFAULT 0;
    SELECT COUNT(*) INTO item_count FROM information_schema.columns
    WHERE table_schema = DATABASE() AND table_name = 'live_session' AND column_name = 'device_streaming';
    IF item_count = 0 THEN ALTER TABLE live_session ADD COLUMN device_streaming TINYINT(1) NOT NULL DEFAULT 0 COMMENT '设备是否正在推流'; END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.columns
    WHERE table_schema = DATABASE() AND table_name = 'live_session' AND column_name = 'cloud_online';
    IF item_count = 0 THEN ALTER TABLE live_session ADD COLUMN cloud_online TINYINT(1) NOT NULL DEFAULT 0 COMMENT '云端是否在线'; END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.columns
    WHERE table_schema = DATABASE() AND table_name = 'live_session' AND column_name = 'cloud_checked_at';
    IF item_count = 0 THEN ALTER TABLE live_session ADD COLUMN cloud_checked_at DATETIME NULL COMMENT '云端检查时间'; END IF;
END $$
CALL upgrade_live_callback() $$
DROP PROCEDURE upgrade_live_callback $$
DELIMITER ;