-- =============================================================================
-- 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;