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qihuaiflow/migrations/021_widen_atom_id.sql
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-- 021: 加宽 skill_trajectory_links.atom_id 列
-- 背景:atom_id 实际值形如 "{trajectory_id}_atom_{i}"(UUID 36 + "_atom_" + 序号 ≈ 45 字符),
-- 原 VARCHAR(36) 过短导致写入时 DataError(1406) Data too long,并使会话进入 rolled-back 状态,
-- 级联触发 PendingRollbackError 与日志 trace_id KeyError 刷屏。
-- 本迁移幂等:重复执行 MODIFY 到相同类型为无害 no-op。
ALTER TABLE `skill_trajectory_links` MODIFY COLUMN `atom_id` VARCHAR(128) NULL;