Merge branch 'master' of https://sinanoaq.cn:8888/r/multi_system

“djh”

2025-07-01 5ca4ab349909030e77354832287f2d6a2c80e119

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ALTER TABLE `train_exam`.`ex_student_answer`
MODIFY COLUMN `answer` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL COMMENT '答案';
 
ALTER TABLE `train_exam`.`ex_exercise_answer`
MODIFY COLUMN `answer` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci  NULL COMMENT '答案';