-- 考培练系统时区数据迁移脚本 - 简化版
-- 将所有UTC时间戳转换为北京时间（+8小时）
-- 只更新确定存在的字段
-- 执行时间：2025-10-17

USE kaopeilian;
SET SQL_SAFE_UPDATES = 0;

-- 核心表：users
UPDATE users SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE users SET last_login_at = DATE_ADD(last_login_at, INTERVAL 8 HOUR) WHERE last_login_at IS NOT NULL;
UPDATE users SET password_changed_at = DATE_ADD(password_changed_at, INTERVAL 8 HOUR) WHERE password_changed_at IS NOT NULL;
UPDATE users SET deleted_at = DATE_ADD(deleted_at, INTERVAL 8 HOUR) WHERE deleted_at IS NOT NULL;

-- teams
UPDATE teams SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE teams SET deleted_at = DATE_ADD(deleted_at, INTERVAL 8 HOUR) WHERE deleted_at IS NOT NULL;

-- user_teams
UPDATE user_teams SET joined_at = DATE_ADD(joined_at, INTERVAL 8 HOUR);

-- courses
UPDATE courses SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE courses SET published_at = DATE_ADD(published_at, INTERVAL 8 HOUR) WHERE published_at IS NOT NULL;
UPDATE courses SET broadcast_generated_at = DATE_ADD(broadcast_generated_at, INTERVAL 8 HOUR) WHERE broadcast_generated_at IS NOT NULL;
UPDATE courses SET deleted_at = DATE_ADD(deleted_at, INTERVAL 8 HOUR) WHERE deleted_at IS NOT NULL;

-- course_materials
UPDATE course_materials SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE course_materials SET deleted_at = DATE_ADD(deleted_at, INTERVAL 8 HOUR) WHERE deleted_at IS NOT NULL;

-- knowledge_points
UPDATE knowledge_points SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);

-- exams
UPDATE exams SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE exams SET start_time = DATE_ADD(start_time, INTERVAL 8 HOUR);
UPDATE exams SET end_time = DATE_ADD(end_time, INTERVAL 8 HOUR) WHERE end_time IS NOT NULL;

-- exam_results
UPDATE exam_results SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);

-- exam_mistakes
UPDATE exam_mistakes SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE exam_mistakes SET mastered_at = DATE_ADD(mastered_at, INTERVAL 8 HOUR) WHERE mastered_at IS NOT NULL;

-- questions
UPDATE questions SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);

-- positions
UPDATE positions SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE positions SET deleted_at = DATE_ADD(deleted_at, INTERVAL 8 HOUR) WHERE deleted_at IS NOT NULL;

-- position_members
UPDATE position_members SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE position_members SET joined_at = DATE_ADD(joined_at, INTERVAL 8 HOUR);
UPDATE position_members SET deleted_at = DATE_ADD(deleted_at, INTERVAL 8 HOUR) WHERE deleted_at IS NOT NULL;

-- system_logs (只有 created_at)
UPDATE system_logs SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR);

-- training相关表
UPDATE training_scenes SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE training_scenes SET deleted_at = DATE_ADD(deleted_at, INTERVAL 8 HOUR) WHERE deleted_at IS NOT NULL;

UPDATE training_sessions SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE training_sessions SET start_time = DATE_ADD(start_time, INTERVAL 8 HOUR);
UPDATE training_sessions SET end_time = DATE_ADD(end_time, INTERVAL 8 HOUR) WHERE end_time IS NOT NULL;

UPDATE training_messages SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);

UPDATE training_reports SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);

-- practice相关表
UPDATE practice_scenes SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);

UPDATE practice_sessions SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);
UPDATE practice_sessions SET start_time = DATE_ADD(start_time, INTERVAL 8 HOUR) WHERE start_time IS NOT NULL;
UPDATE practice_sessions SET end_time = DATE_ADD(end_time, INTERVAL 8 HOUR) WHERE end_time IS NOT NULL;

UPDATE practice_dialogues SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);

UPDATE practice_reports SET created_at = DATE_ADD(created_at, INTERVAL 8 HOUR), updated_at = DATE_ADD(updated_at, INTERVAL 8 HOUR);

SET SQL_SAFE_UPDATES = 1;

-- 验证
SELECT '时区迁移完成！' as message;
SELECT '用户示例：' as '';
SELECT id, username, created_at, updated_at FROM users LIMIT 3;
SELECT '课程示例：' as '';
SELECT id, title, created_at, updated_at FROM courses LIMIT 3;
SELECT '当前时间：' as '';
SELECT NOW() as beijing_time, UTC_TIMESTAMP() as utc_time;