-- 若已按旧版建过 t_mcp_tool，执行本脚本补齐字段（幂等）

ALTER TABLE `t_mcp_tool`
  ADD COLUMN IF NOT EXISTS `Remark` VARCHAR(512) NULL COMMENT '备注' AFTER `SortOrder`;

-- MySQL 8.0.12 前无 IF NOT EXISTS 时，可改用下面手工判断；8.0.29+ 支持 ADD COLUMN IF NOT EXISTS
-- 并发戳：已存在则跳过
SET @col_exists := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 't_mcp_tool'
    AND COLUMN_NAME = 'ConcurrencyStamp'
);
SET @sql := IF(
  @col_exists = 0,
  'ALTER TABLE `t_mcp_tool` ADD COLUMN `ConcurrencyStamp` CHAR(36) NOT NULL DEFAULT (UUID()) COMMENT ''并发戳'' AFTER `IsDeleted`',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @idx_exists := (
  SELECT COUNT(*) FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 't_mcp_tool'
    AND INDEX_NAME = 'idx_mcp_tool_enabled'
);
SET @sql := IF(
  @idx_exists = 0,
  'ALTER TABLE `t_mcp_tool` ADD KEY `idx_mcp_tool_enabled` (`Enabled`, `SortOrder`, `Id`)',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

ALTER TABLE `t_mcp_tool` COMMENT = 'MCP 工具配置表';