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docs/sql/migrate_expected_cell_count_to_qianwan.sql

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+-- =============================================================================
+-- 历史数据刷新：预计细胞数量 单位「亿」→「千万」（数值 ×10）
+-- =============================================================================
+--
+-- 适用：biz_cell_product.expected_cell_count 历史数据按「亿」录入的环境（仅执行一次）。
+-- 执行后：库中数值与界面、API 均为「千万」（例：1000万细胞 → 存 1）。
+--
+-- 注意：
+-- 1. 执行前请备份 biz_cell_product 表
+-- 2. 请勿重复执行（重复 ×10 会导致数据错误）
+-- 3. 若下方「迁移前检查」显示 column_comment 已含「单位:千万」，说明已迁移，跳过第 2 段
+--
+-- =============================================================================
+-- 1. 迁移前检查（建议先单独执行本段）
+-- =============================================================================
+
+SELECT COLUMN_COMMENT AS current_unit_comment
+FROM information_schema.COLUMNS
+WHERE TABLE_SCHEMA = DATABASE()
+  AND TABLE_NAME = 'biz_cell_product'
+  AND COLUMN_NAME = 'expected_cell_count';
+
+SELECT COUNT(*) AS pending_rows
+FROM `biz_cell_product`
+WHERE `del_flag` = 0
+  AND `expected_cell_count` IS NOT NULL;
+
+SELECT
+  `product_code`,
+  `expected_cell_count` AS value_before_yi,
+  `expected_cell_count` * 10 AS value_after_qianwan
+FROM `biz_cell_product`
+WHERE `del_flag` = 0
+  AND `expected_cell_count` IS NOT NULL
+ORDER BY `update_time` DESC
+LIMIT 10;
+
+-- =============================================================================
+-- 2. 正式迁移（确认检查无误后执行）
+-- =============================================================================
+
+START TRANSACTION;
+
+UPDATE `biz_cell_product`
+SET `expected_cell_count` = `expected_cell_count` * 10
+WHERE `del_flag` = 0
+  AND `expected_cell_count` IS NOT NULL;
+
+ALTER TABLE `biz_cell_product`
+  MODIFY COLUMN `expected_cell_count` DECIMAL(18,4) DEFAULT NULL
+  COMMENT '预计细胞数量(单位:千万)';
+
+COMMIT;
+
+-- =============================================================================
+-- 3. 迁移后校验
+-- =============================================================================
+
+SELECT COLUMN_COMMENT AS unit_comment_after_migrate
+FROM information_schema.COLUMNS
+WHERE TABLE_SCHEMA = DATABASE()
+  AND TABLE_NAME = 'biz_cell_product'
+  AND COLUMN_NAME = 'expected_cell_count';
+
+SELECT
+  `product_code`,
+  `expected_cell_count`
+FROM `biz_cell_product`
+WHERE `del_flag` = 0
+  AND `expected_cell_count` IS NOT NULL
+ORDER BY `update_time` DESC
+LIMIT 10;