-- AlterTable
-- 添加 column_mapping 字段到 dc_tool_c_sessions 表
-- 用于解决表头特殊字符问题

ALTER TABLE "dc_schema"."dc_tool_c_sessions" 
ADD COLUMN IF NOT EXISTS "column_mapping" JSONB;

-- 添加注释
COMMENT ON COLUMN "dc_schema"."dc_tool_c_sessions"."column_mapping" IS '列名映射：[{originalName, safeName, displayName}] 解决特殊字符问题';