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-- 允许 userinfo.teacher_admin 为空
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-- 背景：新增学生/普通用户时 teacher_admin 不是必填业务字段，旧库 NOT NULL 约束会导致插入失败。
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ALTER TABLE userinfo
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MODIFY COLUMN teacher_admin TINYINT(1) NULL DEFAULT 0 COMMENT '是否管理型老师：0-否 1-是';
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