feat: 归档旧迁移文件,创建初始化数据迁移和重置脚本
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-- 移除 Carrier 表的 channel_name、channel_code 字段及相关索引
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-- 这些字段未被任何地方使用,属于冗余设计
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-- 先删除联合唯一索引
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DROP INDEX IF EXISTS idx_carrier_type_channel;
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-- 删除 channel_name 字段
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ALTER TABLE tb_carrier DROP COLUMN IF EXISTS channel_name;
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-- 删除 channel_code 字段
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ALTER TABLE tb_carrier DROP COLUMN IF EXISTS channel_code;
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