ALTER TABLE task_definitions
  ADD COLUMN audience_type VARCHAR(32) NOT NULL DEFAULT 'all' COMMENT '适用人群：all/newbie' AFTER description,
  ADD COLUMN icon_key VARCHAR(64) NOT NULL DEFAULT '' COMMENT 'App 任务图标键' AFTER audience_type,
  ADD COLUMN icon_url VARCHAR(512) NOT NULL DEFAULT '' COMMENT 'App 任务图标 URL' AFTER icon_key,
  ADD COLUMN action_type VARCHAR(64) NOT NULL DEFAULT 'none' COMMENT 'App 跳转类型' AFTER icon_url,
  ADD COLUMN action_param VARCHAR(512) NOT NULL DEFAULT '' COMMENT 'App 跳转参数' AFTER action_type,
  ADD COLUMN action_payload_json JSON NULL COMMENT 'App 跳转扩展 JSON' AFTER action_param,
  ADD COLUMN dimension_filter_json JSON NULL COMMENT '任务事件维度过滤 JSON' AFTER action_payload_json;

ALTER TABLE task_event_consumption
  ADD COLUMN metric_type VARCHAR(64) NOT NULL DEFAULT '' COMMENT '任务指标类型' AFTER status,
  ADD COLUMN value_delta BIGINT NOT NULL DEFAULT 0 COMMENT '本次事件进度增量' AFTER metric_type,
  ADD COLUMN dimensions_json JSON NULL COMMENT '事件维度快照 JSON' AFTER value_delta;